Drop six from third_party

Partial commit for third_party/*, see #23870.

Change-Id: I7ff47e721c30e4aaa7001915e3f8b214054ac14e
Signed-off-by: Hee Cha <heec@google.com>
diff --git a/third_party/py/abseil/BUILD b/third_party/py/abseil/BUILD
index 55c659d..9a04607 100644
--- a/third_party/py/abseil/BUILD
+++ b/third_party/py/abseil/BUILD
@@ -14,5 +14,4 @@
     imports = ["."],
     srcs_version = "PY3",
     visibility = ["//visibility:public"],
-    deps = ["//third_party/py/six"],
 )
diff --git a/third_party/py/six/BUILD b/third_party/py/six/BUILD
deleted file mode 100644
index 3637386..0000000
--- a/third_party/py/six/BUILD
+++ /dev/null
@@ -1,17 +0,0 @@
-load("@rules_python//python:defs.bzl", "py_library")
-
-licenses(["notice"])
-
-filegroup(
-    name = "srcs",
-    srcs = glob(["**"]),
-    visibility = ["//visibility:public"],
-)
-
-py_library(
-    name = "six",
-    srcs = ["six.py"],
-    imports = ["."],
-    srcs_version = "PY2AND3",
-    visibility = ["//visibility:public"],
-)
diff --git a/third_party/py/six/CHANGES b/third_party/py/six/CHANGES
deleted file mode 100644
index f3bf6a4..0000000
--- a/third_party/py/six/CHANGES
+++ /dev/null
@@ -1,340 +0,0 @@
-Changelog for six
-=================
-
-This file lists the changes in each six version.
-
-1.16.0
-------
-
-- Pull request #343, issue #341, pull request #349: Port _SixMetaPathImporter to
-  Python 3.10.
-
-1.15.0
-------
-
-- Pull request #331: Optimize `six.ensure_str` and `six.ensure_binary`.
-
-1.14.0
-------
-
-- Issue #288, pull request #289: Add `six.assertNotRegex`.
-
-- Issue #317: `six.moves._dummy_thread` now points to the `_thread` module on
-  Python 3.9+. Python 3.7 and later requires threading and deprecated the
-  `_dummy_thread` module.
-
-- Issue #308, pull request #314: Remove support for Python 2.6 and Python 3.2.
-
-- Issue #250, issue #165, pull request #251: `six.wraps` now ignores missing
-  attributes. This follows the Python 3.2+ standard library behavior.
-
-1.13.0
-------
-
-- Issue #298, pull request #299: Add `six.moves.dbm_ndbm`.
-
-- Issue #155: Add `six.moves.collections_abc`, which aliases the `collections`
-  module on Python 2-3.2 and the `collections.abc` on Python 3.3 and greater.
-
-- Pull request #304: Re-add distutils fallback in `setup.py`.
-
-- Pull request #305: On Python 3.7, `with_metaclass` supports classes using PEP
-  560 features.
-
-1.12.0
-------
-
-- Issue #259, pull request #260: `six.add_metaclass` now preserves
-  `__qualname__` from the original class.
-
-- Pull request #204: Add `six.ensure_binary`, `six.ensure_text`, and
-  `six.ensure_str`.
-
-1.11.0
-------
-
-- Pull request #178: `with_metaclass` now properly proxies `__prepare__` to the
-  underlying metaclass.
-
-- Pull request #191: Allow `with_metaclass` to work with metaclasses implemented
-  in C.
-
-- Pull request #203: Add parse_http_list and parse_keqv_list to moved
-  urllib.request.
-
-- Pull request #172 and issue #171: Add unquote_to_bytes to moved urllib.parse.
-
-- Pull request #167: Add `six.moves.getoutput`.
-
-- Pull request #80: Add `six.moves.urllib_parse.splitvalue`.
-
-- Pull request #75: Add `six.moves.email_mime_image`.
-
-- Pull request #72: Avoid creating reference cycles through tracebacks in
-  `reraise`.
-
-1.10.0
-------
-
-- Issue #122: Improve the performance of `six.int2byte` on Python 3.
-
-- Pull request #55 and issue #99: Don't add the `winreg` module to `six.moves`
-  on non-Windows platforms.
-
-- Pull request #60 and issue #108: Add `six.moves.getcwd` and
-  `six.moves.getcwdu`.
-
-- Pull request #64: Add `create_unbound_method` to create unbound methods.
-
-1.9.0
------
-
-- Issue #106: Support the `flush` parameter to `six.print_`.
-
-- Pull request #48 and issue #15: Add the `python_2_unicode_compatible`
-  decorator.
-
-- Pull request #57 and issue #50: Add several compatibility methods for unittest
-  assertions that were renamed between Python 2 and 3.
-
-- Issue #105 and pull request #58: Ensure `six.wraps` respects the *updated* and
-  *assigned* arguments.
-
-- Issue #102: Add `raise_from` to abstract out Python 3's raise from syntax.
-
-- Issue #97: Optimize `six.iterbytes` on Python 2.
-
-- Issue #98: Fix `six.moves` race condition in multi-threaded code.
-
-- Pull request #51: Add `six.view(keys|values|items)`, which provide dictionary
-  views on Python 2.7+.
-
-- Issue #112: `six.moves.reload_module` now uses the importlib module on
-  Python 3.4+.
-
-1.8.0
------
-
-- Issue #90: Add `six.moves.shlex_quote`.
-
-- Issue #59: Add `six.moves.intern`.
-
-- Add `six.urllib.parse.uses_(fragment|netloc|params|query|relative)`.
-
-- Issue #88: Fix add_metaclass when the class has `__slots__` containing
-  `__weakref__` or `__dict__`.
-
-- Issue #89: Make six use absolute imports.
-
-- Issue #85: Always accept *updated* and *assigned* arguments for `wraps()`.
-
-- Issue #86: In `reraise()`, instantiate the exception if the second argument is
-  `None`.
-
-- Pull request #45: Add `six.moves.email_mime_nonmultipart`.
-
-- Issue #81: Add `six.urllib.request.splittag` mapping.
-
-- Issue #80: Add `six.urllib.request.splituser` mapping.
-
-1.7.3
------
-
-- Issue #77: Fix import six on Python 3.4 with a custom loader.
-
-- Issue #74: `six.moves.xmlrpc_server` should map to `SimpleXMLRPCServer` on Python
-  2 as documented not `xmlrpclib`.
-
-1.7.2
------
-
-- Issue #72: Fix installing on Python 2.
-
-1.7.1
------
-
-- Issue #71: Make the six.moves meta path importer handle reloading of the six
-  module gracefully.
-
-1.7.0
------
-
-- Pull request #30: Implement six.moves with a PEP 302 meta path hook.
-
-- Pull request #32: Add six.wraps, which is like functools.wraps but always sets
-  the __wrapped__ attribute.
-
-- Pull request #35: Improve add_metaclass, so that it doesn't end up inserting
-  another class into the hierarchy.
-
-- Pull request #34: Add import mappings for dummy_thread.
-
-- Pull request #33: Add import mappings for UserDict and UserList.
-
-- Pull request #31: Select the implementations of dictionary iterator routines
-  at import time for a 20% speed boost.
-
-1.6.1
------
-
-- Raise an AttributeError for six.moves.X when X is a module not available in
-  the current interpreter.
-
-1.6.0
------
-
-- Raise an AttributeError for every attribute of unimportable modules.
-
-- Issue #56: Make the fake modules six.moves puts into sys.modules appear not to
-  have a __path__ unless they are loaded.
-
-- Pull request #28: Add support for SplitResult.
-
-- Issue #55: Add move mapping for xmlrpc.server.
-
-- Pull request #29: Add move for urllib.parse.splitquery.
-
-1.5.2
------
-
-- Issue #53: Make the fake modules six.moves puts into sys.modules appear not to
-  have a __name__ unless they are loaded.
-
-1.5.1
------
-
-- Issue #51: Hack around the Django autoreloader after recent six.moves changes.
-
-1.5.0
------
-
-- Removed support for Python 2.4. This is because py.test no longer supports
-  2.4.
-
-- Fix various import problems including issues #19 and #41. six.moves modules
-  are now lazy wrappers over the underlying modules instead of the actual
-  modules themselves.
-
-- Issue #49: Add six.moves mapping for tkinter.ttk.
-
-- Pull request #24: Add __dir__ special method to six.moves modules.
-
-- Issue #47: Fix add_metaclass on classes with a string for the __slots__
-  variable.
-
-- Issue #44: Fix interpretation of backslashes on Python 2 in the u() function.
-
-- Pull request #21: Add import mapping for urllib's proxy_bypass function.
-
-- Issue #43: Add import mapping for the Python 2 xmlrpclib module.
-
-- Issue #39: Add import mapping for the Python 2 thread module.
-
-- Issue #40: Add import mapping for the Python 2 gdbm module.
-
-- Issue #35: On Python versions less than 2.7, print_ now encodes unicode
-  strings when outputting to standard streams. (Python 2.7 handles this
-  automatically.)
-
-1.4.1
------
-
-- Issue #32: urllib module wrappings don't work when six is not a toplevel file.
-
-1.4.0
------
-
-- Issue #31: Add six.moves mapping for UserString.
-
-- Pull request #12: Add six.add_metaclass, a decorator for adding a metaclass to
-  a class.
-
-- Add six.moves.zip_longest and six.moves.filterfalse, which correspond
-  respectively to itertools.izip_longest and itertools.ifilterfalse on Python 2
-  and itertools.zip_longest and itertools.filterfalse on Python 3.
-
-- Issue #25: Add the unichr function, which returns a string for a Unicode
-  codepoint.
-
-- Issue #26: Add byte2int function, which complements int2byte.
-
-- Add a PY2 constant with obvious semantics.
-
-- Add helpers for indexing and iterating over bytes: iterbytes and indexbytes.
-
-- Add create_bound_method() wrapper.
-
-- Issue #23: Allow multiple base classes to be passed to with_metaclass.
-
-- Issue #24: Add six.moves.range alias. This exactly the same as the current
-  xrange alias.
-
-- Pull request #5: Create six.moves.urllib, which contains abstractions for a
-  bunch of things which are in urllib in Python 3 and spread out across urllib,
-  urllib2, and urlparse in Python 2.
-
-1.3.0
------
-
-- Issue #21: Add methods to access the closure and globals of a function.
-
-- In six.iter(items/keys/values/lists), passed keyword arguments through to the
-  underlying method.
-
-- Add six.iterlists().
-
-- Issue #20: Fix tests if tkinter is not available.
-
-- Issue #17: Define callable to be builtin callable when it is available again
-  in Python 3.2+.
-
-- Issue #16: Rename Python 2 exec_'s arguments, so casually calling exec_ with
-  keyword arguments will raise.
-
-- Issue #14: Put the six.moves package in sys.modules based on the name six is
-  imported under.
-
-- Fix Jython detection.
-
-- Pull request #4: Add email_mime_multipart, email_mime_text, and
-  email_mime_base to six.moves.
-
-1.2.0
------
-
-- Issue #13: Make iterkeys/itervalues/iteritems return iterators on Python 3
-  instead of iterables.
-
-- Issue #11: Fix maxsize support on Jython.
-
-- Add six.next() as an alias for six.advance_iterator().
-
-- Use the builtin next() function for advance_iterator() where is available
-  (2.6+), not just Python 3.
-
-- Add the Iterator class for writing portable iterators.
-
-1.1.0
------
-
-- Add the int2byte function.
-
-- Add compatibility mappings for iterators over the keys, values, and items of a
-  dictionary.
-
-- Fix six.MAXSIZE on platforms where sizeof(long) != sizeof(Py_ssize_t).
-
-- Issue #3: Add six.moves mappings for filter, map, and zip.
-
-1.0.0
------
-
-- Issue #2: u() on Python 2.x now resolves unicode escapes.
-
-- Expose an API for adding mappings to six.moves.
-
-1.0 beta 1
-----------
-
-- Reworked six into one .py file.  This breaks imports.  Please tell me if you
-  are interested in an import compatibility layer.
diff --git a/third_party/py/six/CONTRIBUTORS b/third_party/py/six/CONTRIBUTORS
deleted file mode 100644
index a76dffd..0000000
--- a/third_party/py/six/CONTRIBUTORS
+++ /dev/null
@@ -1,44 +0,0 @@
-The primary author and maintainer of six is Benjamin Peterson. He would like to
-acknowledge the following people who submitted bug reports, pull requests, and
-otherwise worked to improve six:
-
-Marc Abramowitz
-immerrr again
-Alexander Artemenko
-Aymeric Augustin
-Lee Ball
-Ben Bariteau
-Ned Batchelder
-Wouter Bolsterlee
-Brett Cannon
-Jason R. Coombs
-Julien Danjou
-Ben Darnell
-Ben Davis
-Jon Dufresne
-Tim Graham
-Thomas Grainger
-Max Grender-Jones
-Pierre Grimaud
-Joshua Harlow
-Toshiki Kataoka
-Hugo van Kemenade
-Anselm Kruis
-Ivan Levkivskyi
-Alexander Lukanin
-James Mills
-Jordan Moldow
-Berker Peksag
-Sridhar Ratnakumar
-Erik Rose
-Mirko Rossini
-Peter Ruibal
-Miroslav Shubernetskiy
-Eli Schwartz
-Anthony Sottile
-Victor Stinner
-Jonathan Vanasco
-Lucas Wiman
-Jingxin Zhu
-
-If you think you belong on this list, please let me know! --Benjamin
diff --git a/third_party/py/six/LICENSE b/third_party/py/six/LICENSE
deleted file mode 100644
index de66331..0000000
--- a/third_party/py/six/LICENSE
+++ /dev/null
@@ -1,18 +0,0 @@
-Copyright (c) 2010-2020 Benjamin Peterson
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/third_party/py/six/MANIFEST.in b/third_party/py/six/MANIFEST.in
deleted file mode 100644
index b924e06..0000000
--- a/third_party/py/six/MANIFEST.in
+++ /dev/null
@@ -1,6 +0,0 @@
-include CHANGES
-include LICENSE
-include test_six.py
-
-recursive-include documentation *
-prune documentation/_build
diff --git a/third_party/py/six/README.rst b/third_party/py/six/README.rst
deleted file mode 100644
index 6339ba5..0000000
--- a/third_party/py/six/README.rst
+++ /dev/null
@@ -1,29 +0,0 @@
-.. image:: https://img.shields.io/pypi/v/six.svg
-   :target: https://pypi.org/project/six/
-   :alt: six on PyPI
-
-.. image:: https://travis-ci.org/benjaminp/six.svg?branch=master
-   :target: https://travis-ci.org/benjaminp/six
-   :alt: six on TravisCI
-
-.. image:: https://readthedocs.org/projects/six/badge/?version=latest
-   :target: https://six.readthedocs.io/
-   :alt: six's documentation on Read the Docs
-
-.. image:: https://img.shields.io/badge/license-MIT-green.svg
-   :target: https://github.com/benjaminp/six/blob/master/LICENSE
-   :alt: MIT License badge
-
-Six is a Python 2 and 3 compatibility library.  It provides utility functions
-for smoothing over the differences between the Python versions with the goal of
-writing Python code that is compatible on both Python versions.  See the
-documentation for more information on what is provided.
-
-Six supports Python 2.7 and 3.3+.  It is contained in only one Python
-file, so it can be easily copied into your project. (The copyright and license
-notice must be retained.)
-
-Online documentation is at https://six.readthedocs.io/.
-
-Bugs can be reported to https://github.com/benjaminp/six.  The code can also
-be found there.
diff --git a/third_party/py/six/documentation/Makefile b/third_party/py/six/documentation/Makefile
deleted file mode 100644
index eebafcd..0000000
--- a/third_party/py/six/documentation/Makefile
+++ /dev/null
@@ -1,130 +0,0 @@
-# Makefile for Sphinx documentation
-#
-
-# You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
-BUILDDIR      = _build
-
-# Internal variables.
-PAPEROPT_a4     = -D latex_paper_size=a4
-PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
-
-.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest
-
-help:
-	@echo "Please use \`make <target>' where <target> is one of"
-	@echo "  html       to make standalone HTML files"
-	@echo "  dirhtml    to make HTML files named index.html in directories"
-	@echo "  singlehtml to make a single large HTML file"
-	@echo "  pickle     to make pickle files"
-	@echo "  json       to make JSON files"
-	@echo "  htmlhelp   to make HTML files and a HTML help project"
-	@echo "  qthelp     to make HTML files and a qthelp project"
-	@echo "  devhelp    to make HTML files and a Devhelp project"
-	@echo "  epub       to make an epub"
-	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
-	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
-	@echo "  text       to make text files"
-	@echo "  man        to make manual pages"
-	@echo "  changes    to make an overview of all changed/added/deprecated items"
-	@echo "  linkcheck  to check all external links for integrity"
-	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
-
-clean:
-	-rm -rf $(BUILDDIR)/*
-
-html:
-	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
-	@echo
-	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
-
-dirhtml:
-	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
-	@echo
-	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
-
-singlehtml:
-	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
-	@echo
-	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
-
-pickle:
-	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
-	@echo
-	@echo "Build finished; now you can process the pickle files."
-
-json:
-	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
-	@echo
-	@echo "Build finished; now you can process the JSON files."
-
-htmlhelp:
-	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
-	@echo
-	@echo "Build finished; now you can run HTML Help Workshop with the" \
-	      ".hhp project file in $(BUILDDIR)/htmlhelp."
-
-qthelp:
-	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
-	@echo
-	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
-	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
-	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/six.qhcp"
-	@echo "To view the help file:"
-	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/six.qhc"
-
-devhelp:
-	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
-	@echo
-	@echo "Build finished."
-	@echo "To view the help file:"
-	@echo "# mkdir -p $$HOME/.local/share/devhelp/six"
-	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/six"
-	@echo "# devhelp"
-
-epub:
-	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
-	@echo
-	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
-
-latex:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
-	@echo
-	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
-	@echo "Run \`make' in that directory to run these through (pdf)latex" \
-	      "(use \`make latexpdf' here to do that automatically)."
-
-latexpdf:
-	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
-	@echo "Running LaTeX files through pdflatex..."
-	make -C $(BUILDDIR)/latex all-pdf
-	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
-
-text:
-	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
-	@echo
-	@echo "Build finished. The text files are in $(BUILDDIR)/text."
-
-man:
-	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
-	@echo
-	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
-
-changes:
-	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
-	@echo
-	@echo "The overview file is in $(BUILDDIR)/changes."
-
-linkcheck:
-	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
-	@echo
-	@echo "Link check complete; look for any errors in the above output " \
-	      "or in $(BUILDDIR)/linkcheck/output.txt."
-
-doctest:
-	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
-	@echo "Testing of doctests in the sources finished, look at the " \
-	      "results in $(BUILDDIR)/doctest/output.txt."
diff --git a/third_party/py/six/documentation/conf.py b/third_party/py/six/documentation/conf.py
deleted file mode 100644
index 2f0f323..0000000
--- a/third_party/py/six/documentation/conf.py
+++ /dev/null
@@ -1,217 +0,0 @@
-# -*- coding: utf-8 -*-
-#
-# six documentation build configuration file
-
-import os
-import sys
-
-# If extensions (or modules to document with autodoc) are in another directory,
-# add these directories to sys.path here. If the directory is relative to the
-# documentation root, use os.path.abspath to make it absolute, like shown here.
-#sys.path.append(os.path.abspath('.'))
-
-# -- General configuration -----------------------------------------------------
-
-# If your documentation needs a minimal Sphinx version, state it here.
-needs_sphinx = "1.0"
-
-# Add any Sphinx extension module names here, as strings. They can be extensions
-# coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["sphinx.ext.intersphinx"]
-
-# Add any paths that contain templates here, relative to this directory.
-templates_path = ["_templates"]
-
-# The suffix of source filenames.
-source_suffix = ".rst"
-
-# The encoding of source files.
-#source_encoding = "utf-8-sig"
-
-# The master toctree document.
-master_doc = "index"
-
-# General information about the project.
-project = u"six"
-copyright = u"2010-2020, Benjamin Peterson"
-
-sys.path.append(os.path.abspath(os.path.join(".", "..")))
-from six import __version__ as six_version
-sys.path.pop()
-
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
-version = six_version[:-2]
-# The full version, including alpha/beta/rc tags.
-release = six_version
-
-# The language for content autogenerated by Sphinx. Refer to documentation
-# for a list of supported languages.
-#language = None
-
-# There are two options for replacing |today|: either, you set today to some
-# non-false value, then it is used:
-#today = ''
-# Else, today_fmt is used as the format for a strftime call.
-#today_fmt = '%B %d, %Y'
-
-# List of patterns, relative to source directory, that match files and
-# directories to ignore when looking for source files.
-exclude_patterns = ["_build"]
-
-# The reST default role (used for this markup: `text`) to use for all documents.
-#default_role = None
-
-# If true, '()' will be appended to :func: etc. cross-reference text.
-#add_function_parentheses = True
-
-# If true, the current module name will be prepended to all description
-# unit titles (such as .. function::).
-#add_module_names = True
-
-# If true, sectionauthor and moduleauthor directives will be shown in the
-# output. They are ignored by default.
-#show_authors = False
-
-# The name of the Pygments (syntax highlighting) style to use.
-pygments_style = "sphinx"
-
-# A list of ignored prefixes for module index sorting.
-#modindex_common_prefix = []
-
-
-# -- Options for HTML output ---------------------------------------------------
-
-# The theme to use for HTML and HTML Help pages.  See the documentation for
-# a list of builtin themes.
-html_theme = "default"
-
-# Theme options are theme-specific and customize the look and feel of a theme
-# further.  For a list of options available for each theme, see the
-# documentation.
-#html_theme_options = {}
-
-# Add any paths that contain custom themes here, relative to this directory.
-#html_theme_path = []
-
-# The name for this set of Sphinx documents.  If None, it defaults to
-# "<project> v<release> documentation".
-#html_title = None
-
-# A shorter title for the navigation bar.  Default is the same as html_title.
-#html_short_title = None
-
-# The name of an image file (relative to this directory) to place at the top
-# of the sidebar.
-#html_logo = None
-
-# The name of an image file (within the static path) to use as favicon of the
-# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
-# pixels large.
-#html_favicon = None
-
-# Add any paths that contain custom static files (such as style sheets) here,
-# relative to this directory. They are copied after the builtin static files,
-# so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ["_static"]
-
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-#html_last_updated_fmt = '%b %d, %Y'
-
-# If true, SmartyPants will be used to convert quotes and dashes to
-# typographically correct entities.
-#html_use_smartypants = True
-
-# Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
-
-# Additional templates that should be rendered to pages, maps page names to
-# template names.
-#html_additional_pages = {}
-
-# If false, no module index is generated.
-#html_domain_indices = True
-
-# If false, no index is generated.
-#html_use_index = True
-
-# If true, the index is split into individual pages for each letter.
-#html_split_index = False
-
-# If true, links to the reST sources are added to the pages.
-#html_show_sourcelink = True
-
-# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
-#html_show_sphinx = True
-
-# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
-#html_show_copyright = True
-
-# If true, an OpenSearch description file will be output, and all pages will
-# contain a <link> tag referring to it.  The value of this option must be the
-# base URL from which the finished HTML is served.
-#html_use_opensearch = ''
-
-# If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
-#html_file_suffix = ''
-
-# Output file base name for HTML help builder.
-htmlhelp_basename = 'sixdoc'
-
-
-# -- Options for LaTeX output --------------------------------------------------
-
-# The paper size ('letter' or 'a4').
-#latex_paper_size = 'letter'
-
-# The font size ('10pt', '11pt' or '12pt').
-#latex_font_size = '10pt'
-
-# Grouping the document tree into LaTeX files. List of tuples
-# (source start file, target name, title, author, documentclass [howto/manual]).
-latex_documents = [
-  ("index", "six.tex", u"six Documentation",
-   u"Benjamin Peterson", "manual"),
-]
-
-# The name of an image file (relative to this directory) to place at the top of
-# the title page.
-#latex_logo = None
-
-# For "manual" documents, if this is true, then toplevel headings are parts,
-# not chapters.
-#latex_use_parts = False
-
-# If true, show page references after internal links.
-#latex_show_pagerefs = False
-
-# If true, show URL addresses after external links.
-#latex_show_urls = False
-
-# Additional stuff for the LaTeX preamble.
-#latex_preamble = ''
-
-# Documents to append as an appendix to all manuals.
-#latex_appendices = []
-
-# If false, no module index is generated.
-#latex_domain_indices = True
-
-
-# -- Options for manual page output --------------------------------------------
-
-# One entry per manual page. List of tuples
-# (source start file, name, description, authors, manual section).
-man_pages = [
-    ("index", "six", u"six Documentation",
-     [u"Benjamin Peterson"], 1)
-]
-
-# -- Intersphinx ---------------------------------------------------------------
-
-intersphinx_mapping = {"py2" : ("https://docs.python.org/2/", None),
-                       "py3" : ("https://docs.python.org/3/", None)}
diff --git a/third_party/py/six/documentation/index.rst b/third_party/py/six/documentation/index.rst
deleted file mode 100644
index 45390b8..0000000
--- a/third_party/py/six/documentation/index.rst
+++ /dev/null
@@ -1,882 +0,0 @@
-Six: Python 2 and 3 Compatibility Library
-=========================================
-
-.. module:: six
-   :synopsis: Python 2 and 3 compatibility
-
-.. moduleauthor:: Benjamin Peterson <benjamin@python.org>
-.. sectionauthor:: Benjamin Peterson <benjamin@python.org>
-
-
-Six provides simple utilities for wrapping over differences between Python 2 and
-Python 3.  It is intended to support codebases that work on both Python 2 and 3
-without modification.  six consists of only one Python file, so it is painless
-to copy into a project.
-
-Six can be downloaded on `PyPI <https://pypi.org/project/six/>`_.  Its bug
-tracker and code hosting is on `GitHub <https://github.com/benjaminp/six>`_.
-
-The name, "six", comes from the fact that 2*3 equals 6.  Why not addition?
-Multiplication is more powerful, and, anyway, "five" has already been snatched
-away by the (admittedly now moribund) Zope Five project.
-
-
-Indices and tables
-------------------
-
-* :ref:`genindex`
-* :ref:`search`
-
-
-Package contents
-----------------
-
-.. data:: PY2
-
-   A boolean indicating if the code is running on Python 2.
-
-.. data:: PY3
-
-   A boolean indicating if the code is running on Python 3.
-
-
-Constants
->>>>>>>>>
-
-Six provides constants that may differ between Python versions.  Ones ending
-``_types`` are mostly useful as the second argument to ``isinstance`` or
-``issubclass``.
-
-
-.. data:: class_types
-
-   Possible class types.  In Python 2, this encompasses old-style
-   :data:`py2:types.ClassType` and new-style ``type`` classes.  In Python 3,
-   this is just ``type``.
-
-
-.. data:: integer_types
-
-   Possible integer types.  In Python 2, this is :func:`py2:long` and
-   :func:`py2:int`, and in Python 3, just :func:`py3:int`.
-
-
-.. data:: string_types
-
-   Possible types for text data.  This is :func:`py2:basestring` in Python 2 and
-   :func:`py3:str` in Python 3.
-
-
-.. data:: text_type
-
-   Type for representing (Unicode) textual data.  This is :func:`py2:unicode` in
-   Python 2 and :func:`py3:str` in Python 3.
-
-
-.. data:: binary_type
-
-   Type for representing binary data.  This is :func:`py2:str` in Python 2 and
-   :func:`py3:bytes` in Python 3.  Python 2.6 and 2.7 include ``bytes`` as a
-   builtin alias of ``str``, so six’s version is only necessary for Python 2.5
-   compatibility.
-
-
-.. data:: MAXSIZE
-
-   The maximum  size of a  container like :func:`py3:list`  or :func:`py3:dict`.
-   This  is  equivalent  to  :data:`py3:sys.maxsize` in  Python  2.6  and  later
-   (including 3.x).   Note, this is temptingly  similar to, but not  the same as
-   :data:`py2:sys.maxint`  in  Python  2.   There is  no  direct  equivalent  to
-   :data:`py2:sys.maxint` in  Python 3  because its integer  type has  no limits
-   aside from memory.
-
-
-Here's example usage of the module::
-
-   import six
-
-   def dispatch_types(value):
-       if isinstance(value, six.integer_types):
-           handle_integer(value)
-       elif isinstance(value, six.class_types):
-           handle_class(value)
-       elif isinstance(value, six.string_types):
-           handle_string(value)
-
-
-Object model compatibility
->>>>>>>>>>>>>>>>>>>>>>>>>>
-
-Python 3 renamed the attributes of several interpreter data structures.  The
-following accessors are available.  Note that the recommended way to inspect
-functions and methods is the stdlib :mod:`py3:inspect` module.
-
-
-.. function:: get_unbound_function(meth)
-
-   Get the function out of unbound method *meth*.  In Python 3, unbound methods
-   don't exist, so this function just returns *meth* unchanged.  Example
-   usage::
-
-      from six import get_unbound_function
-
-      class X(object):
-          def method(self):
-              pass
-      method_function = get_unbound_function(X.method)
-
-
-.. function:: get_method_function(meth)
-
-   Get the function out of method object *meth*.
-
-
-.. function:: get_method_self(meth)
-
-   Get the ``self`` of bound method *meth*.
-
-
-.. function:: get_function_closure(func)
-
-   Get the closure (list of cells) associated with *func*.  This is equivalent
-   to ``func.__closure__`` on Python 2.6+ and ``func.func_closure`` on Python
-   2.5.
-
-
-.. function:: get_function_code(func)
-
-   Get the code object associated with *func*.  This is equivalent to
-   ``func.__code__`` on Python 2.6+ and ``func.func_code`` on Python 2.5.
-
-
-.. function:: get_function_defaults(func)
-
-   Get the defaults tuple associated with *func*.  This is equivalent to
-   ``func.__defaults__`` on Python 2.6+ and ``func.func_defaults`` on Python
-   2.5.
-
-
-.. function:: get_function_globals(func)
-
-   Get the globals of *func*.  This is equivalent to ``func.__globals__`` on
-   Python 2.6+ and ``func.func_globals`` on Python 2.5.
-
-
-.. function:: next(it)
-              advance_iterator(it)
-
-   Get the next item of iterator *it*.  :exc:`py3:StopIteration` is raised if
-   the iterator is exhausted.  This is a replacement for calling ``it.next()``
-   in Python 2 and ``next(it)`` in Python 3.  Python 2.6 and above have a
-   builtin ``next`` function, so six's version is only necessary for Python 2.5
-   compatibility.
-
-
-.. function:: callable(obj)
-
-   Check if *obj* can be called.  Note ``callable`` has returned in Python 3.2,
-   so using six's version is only necessary when supporting Python 3.0 or 3.1.
-
-
-.. function:: iterkeys(dictionary, **kwargs)
-
-   Returns an iterator over *dictionary*\'s keys. This replaces
-   ``dictionary.iterkeys()`` on Python 2 and ``dictionary.keys()`` on
-   Python 3.  *kwargs* are passed through to the underlying method.
-
-
-.. function:: itervalues(dictionary, **kwargs)
-
-   Returns an iterator over *dictionary*\'s values. This replaces
-   ``dictionary.itervalues()`` on Python 2 and ``dictionary.values()`` on
-   Python 3.  *kwargs* are passed through to the underlying method.
-
-
-.. function:: iteritems(dictionary, **kwargs)
-
-   Returns an iterator over *dictionary*\'s items. This replaces
-   ``dictionary.iteritems()`` on Python 2 and ``dictionary.items()`` on
-   Python 3.  *kwargs* are passed through to the underlying method.
-
-
-.. function:: iterlists(dictionary, **kwargs)
-
-   Calls ``dictionary.iterlists()`` on Python 2 and ``dictionary.lists()`` on
-   Python 3.  No builtin Python mapping type has such a method; this method is
-   intended for use with multi-valued dictionaries like `Werkzeug's
-   <http://werkzeug.pocoo.org/docs/datastructures/#werkzeug.datastructures.MultiDict>`_.
-   *kwargs* are passed through to the underlying method.
-
-
-.. function:: viewkeys(dictionary)
-
-   Return a view over *dictionary*\'s keys. This replaces
-   :meth:`py2:dict.viewkeys` on Python 2.7 and :meth:`py3:dict.keys` on
-   Python 3.
-
-
-.. function:: viewvalues(dictionary)
-
-   Return a view over *dictionary*\'s values. This replaces
-   :meth:`py2:dict.viewvalues` on Python 2.7 and :meth:`py3:dict.values` on
-   Python 3.
-
-
-.. function:: viewitems(dictionary)
-
-   Return a view over *dictionary*\'s items. This replaces
-   :meth:`py2:dict.viewitems` on Python 2.7 and :meth:`py3:dict.items` on
-   Python 3.
-
-
-.. function:: create_bound_method(func, obj)
-
-   Return a method object wrapping *func* and bound to *obj*.  On both Python 2
-   and 3, this will return a :func:`py3:types.MethodType` object.  The reason
-   this wrapper exists is that on Python 2, the ``MethodType`` constructor
-   requires the *obj*'s class to be passed.
-
-
-.. function:: create_unbound_method(func, cls)
-
-   Return an unbound method object wrapping *func*.  In Python 2, this will
-   return a :func:`py2:types.MethodType` object.  In Python 3, unbound methods
-   do not exist and this wrapper will simply return *func*.
-
-
-.. class:: Iterator
-
-   A class for making portable iterators. The intention is that it be subclassed
-   and subclasses provide a ``__next__`` method. In Python 2, :class:`Iterator`
-   has one method: ``next``. It simply delegates to ``__next__``. An alternate
-   way to do this would be to simply alias ``next`` to ``__next__``. However,
-   this interacts badly with subclasses that override
-   ``__next__``. :class:`Iterator` is empty on Python 3. (In fact, it is just
-   aliased to :class:`py3:object`.)
-
-
-.. decorator:: wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS, updated=functools.WRAPPER_UPDATES)
-
-   This is Python 3.2's :func:`py3:functools.wraps` decorator.  It sets the
-   ``__wrapped__`` attribute on what it decorates.  It doesn't raise an error if
-   any of the attributes mentioned in ``assigned`` and ``updated`` are missing
-   on ``wrapped`` object.
-
-
-Syntax compatibility
->>>>>>>>>>>>>>>>>>>>
-
-These functions smooth over operations which have different syntaxes between
-Python 2 and 3.
-
-
-.. function:: exec_(code, globals=None, locals=None)
-
-   Execute *code* in the scope of *globals* and *locals*.  *code* can be a
-   string or a code object.  If *globals* or *locals* are not given, they will
-   default to the scope of the caller.  If just *globals* is given, it will also
-   be used as *locals*.
-
-   .. note::
-
-      Python 3's :func:`py3:exec` doesn't take keyword arguments, so calling
-      :func:`exec` with them should be avoided.
-
-
-.. function:: print_(*args, *, file=sys.stdout, end="\\n", sep=" ", flush=False)
-
-   Print *args* into *file*.  Each argument will be separated with *sep* and
-   *end* will be written to the file after the last argument is printed.  If
-   *flush* is true, ``file.flush()`` will be called after all data is written.
-
-   .. note::
-
-      In Python 2, this function imitates Python 3's :func:`py3:print` by not
-      having softspace support.  If you don't know what that is, you're probably
-      ok. :)
-
-
-.. function:: raise_from(exc_value, exc_value_from)
-
-   Raise an exception from a context.  On Python 3, this is equivalent to
-   ``raise exc_value from exc_value_from``.  On Python 2, which does not support
-   exception chaining, it is equivalent to ``raise exc_value``.
-
-
-.. function:: reraise(exc_type, exc_value, exc_traceback=None)
-
-   Reraise an exception, possibly with a different traceback.  In the simple
-   case, ``reraise(*sys.exc_info())`` with an active exception (in an except
-   block) reraises the current exception with the last traceback.  A different
-   traceback can be specified with the *exc_traceback* parameter.  Note that
-   since the exception reraising is done within the :func:`reraise` function,
-   Python will attach the call frame of :func:`reraise` to whatever traceback is
-   raised.
-
-
-.. function:: with_metaclass(metaclass, *bases)
-
-   Create a new class with base classes *bases* and metaclass *metaclass*.  This
-   is designed to be used in class declarations like this: ::
-
-      from six import with_metaclass
-
-      class Meta(type):
-          pass
-
-      class Base(object):
-          pass
-
-      class MyClass(with_metaclass(Meta, Base)):
-          pass
-
-   Another way to set a metaclass on a class is with the :func:`add_metaclass`
-   decorator.
-
-
-.. decorator:: add_metaclass(metaclass)
-
-   Class decorator that replaces a normally-constructed class with a
-   metaclass-constructed one.  Example usage: ::
-
-       @add_metaclass(Meta)
-       class MyClass(object):
-           pass
-
-   That code produces a class equivalent to ::
-
-       class MyClass(object, metaclass=Meta):
-           pass
-
-   on Python 3 or ::
-
-       class MyClass(object):
-           __metaclass__ = Meta
-
-   on Python 2.
-
-   Note that class decorators require Python 2.6. However, the effect of the
-   decorator can be emulated on Python 2.5 like so::
-
-       class MyClass(object):
-           pass
-       MyClass = add_metaclass(Meta)(MyClass)
-
-
-Binary and text data
->>>>>>>>>>>>>>>>>>>>
-
-Python 3 enforces the distinction between byte strings and text strings far more
-rigorously than Python 2 does; binary data cannot be automatically coerced to
-or from text data.  six provides several functions to assist in classifying
-string data in all Python versions.
-
-
-.. function:: b(data)
-
-   A "fake" bytes literal.  *data* should always be a normal string literal.  In
-   Python 2, :func:`b` returns an 8-bit string.  In Python 3, *data* is encoded
-   with the latin-1 encoding to bytes.
-
-
-   .. note::
-
-      Since all Python versions 2.6 and after support the ``b`` prefix,
-      code without 2.5 support doesn't need :func:`b`.
-
-
-.. function:: u(text)
-
-   A "fake" unicode literal.  *text* should always be a normal string literal.
-   In Python 2, :func:`u` returns unicode, and in Python 3, a string.  Also, in
-   Python 2, the string is decoded with the ``unicode-escape`` codec, which
-   allows unicode escapes to be used in it.
-
-
-   .. note::
-
-      In Python 3.3, the ``u`` prefix has been reintroduced. Code that only
-      supports Python 3 versions of 3.3 and higher thus does not need
-      :func:`u`.
-
-   .. note::
-
-      On Python 2, :func:`u` doesn't know what the encoding of the literal
-      is. Each byte is converted directly to the unicode codepoint of the same
-      value. Because of this, it's only safe to use :func:`u` with strings of
-      ASCII data.
-
-
-.. function:: unichr(c)
-
-   Return the (Unicode) string representing the codepoint *c*.  This is
-   equivalent to :func:`py2:unichr` on Python 2 and :func:`py3:chr` on Python 3.
-
-
-.. function:: int2byte(i)
-
-   Converts *i* to a byte.  *i* must be in ``range(0, 256)``.  This is
-   equivalent to :func:`py2:chr` in Python 2 and ``bytes((i,))`` in Python 3.
-
-
-.. function:: byte2int(bs)
-
-   Converts the first byte of *bs* to an integer.  This is equivalent to
-   ``ord(bs[0])`` on Python 2 and ``bs[0]`` on Python 3.
-
-
-.. function:: indexbytes(buf, i)
-
-   Return the byte at index *i* of *buf* as an integer.  This is equivalent to
-   indexing a bytes object in Python 3.
-
-
-.. function:: iterbytes(buf)
-
-   Return an iterator over bytes in *buf* as integers.  This is equivalent to
-   a bytes object iterator in Python 3.
-
-
-.. function:: ensure_binary(s, encoding='utf-8', errors='strict')
-
-   Coerce *s* to :data:`binary_type`. *encoding*, *errors* are the same as
-   :meth:`py3:str.encode`
-
-
-.. function:: ensure_str(s, encoding='utf-8', errors='strict')
-
-   Coerce *s* to ``str``. *encoding*, *errors* are the same as
-   :meth:`py3:str.encode`
-
-
-.. function:: ensure_text(s, encoding='utf-8', errors='strict')
-
-   Coerce *s* to :data:`text_type`. *encoding*, *errors* are the same as
-   :meth:`py3:bytes.decode`
-
-
-.. data:: StringIO
-
-   This is a fake file object for textual data.  It's an alias for
-   :class:`py2:StringIO.StringIO` in Python 2 and :class:`py3:io.StringIO` in
-   Python 3.
-
-
-.. data:: BytesIO
-
-   This is a fake file object for binary data.  In Python 2, it's an alias for
-   :class:`py2:StringIO.StringIO`, but in Python 3, it's an alias for
-   :class:`py3:io.BytesIO`.
-
-
-.. decorator:: python_2_unicode_compatible
-
-   A class decorator that takes a class defining a ``__str__`` method.  On
-   Python 3, the decorator does nothing.  On Python 2, it aliases the
-   ``__str__`` method to ``__unicode__`` and creates a new ``__str__`` method
-   that returns the result of ``__unicode__()`` encoded with UTF-8.
-
-
-unittest assertions
->>>>>>>>>>>>>>>>>>>
-
-Six contains compatibility shims for unittest assertions that have been renamed.
-The parameters are the same as their aliases, but you must pass the test method
-as the first argument. For example::
-
-    import six
-    import unittest
-
-    class TestAssertCountEqual(unittest.TestCase):
-        def test(self):
-            six.assertCountEqual(self, (1, 2), [2, 1])
-
-Note these functions are only available on Python 2.7 or later.
-
-.. function:: assertCountEqual()
-
-   Alias for :meth:`~py3:unittest.TestCase.assertCountEqual` on Python 3 and
-   :meth:`~py2:unittest.TestCase.assertItemsEqual` on Python 2.
-
-
-.. function:: assertRaisesRegex()
-
-   Alias for :meth:`~py3:unittest.TestCase.assertRaisesRegex` on Python 3 and
-   :meth:`~py2:unittest.TestCase.assertRaisesRegexp` on Python 2.
-
-
-.. function:: assertRegex()
-
-   Alias for :meth:`~py3:unittest.TestCase.assertRegex` on Python 3 and
-   :meth:`~py2:unittest.TestCase.assertRegexpMatches` on Python 2.
-
-.. function:: assertNotRegex()
-
-   Alias for :meth:`~py3:unittest.TestCase.assertNotRegex` on Python 3 and
-   :meth:`~py2:unittest.TestCase.assertNotRegexpMatches` on Python 2.
-
-
-Renamed modules and attributes compatibility
->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
-
-.. module:: six.moves
-   :synopsis: Renamed modules and attributes compatibility
-
-Python 3 reorganized the standard library and moved several functions to
-different modules.  Six provides a consistent interface to them through the fake
-:mod:`six.moves` module.  For example, to load the module for parsing HTML on
-Python 2 or 3, write::
-
-   from six.moves import html_parser
-
-Similarly, to get the function to reload modules, which was moved from the
-builtin module to the ``importlib`` module, use::
-
-   from six.moves import reload_module
-
-For the most part, :mod:`six.moves` aliases are the names of the modules in
-Python 3.  When the new Python 3 name is a package, the components of the name
-are separated by underscores.  For example, ``html.parser`` becomes
-``html_parser``.  In some cases where several modules have been combined, the
-Python 2 name is retained.  This is so the appropriate modules can be found when
-running on Python 2.  For example, ``BaseHTTPServer`` which is in
-``http.server`` in Python 3 is aliased as ``BaseHTTPServer``.
-
-Some modules which had two implementations have been merged in Python 3.  For
-example, ``cPickle`` no longer exists in Python 3; it was merged with
-``pickle``.  In these cases, fetching the fast version will load the fast one on
-Python 2 and the merged module in Python 3.
-
-The :mod:`py2:urllib`, :mod:`py2:urllib2`, and :mod:`py2:urlparse` modules have
-been combined in the :mod:`py3:urllib` package in Python 3.  The
-:mod:`six.moves.urllib` package is a version-independent location for this
-functionality; its structure mimics the structure of the Python 3
-:mod:`py3:urllib` package.
-
-.. note::
-
-   In order to make imports of the form::
-
-     from six.moves.cPickle import loads
-
-   work, six places special proxy objects in :data:`py3:sys.modules`. These
-   proxies lazily load the underlying module when an attribute is fetched. This
-   will fail if the underlying module is not available in the Python
-   interpreter. For example, ``sys.modules["six.moves.winreg"].LoadKey`` would
-   fail on any non-Windows platform. Unfortunately, some applications try to
-   load attributes on every module in :data:`py3:sys.modules`. six mitigates
-   this problem for some applications by pretending attributes on unimportable
-   modules do not exist. This hack does not work in every case, though. If you are
-   encountering problems with the lazy modules and don't use any from imports
-   directly from ``six.moves`` modules, you can workaround the issue by removing
-   the six proxy modules::
-
-     d = [name for name in sys.modules if name.startswith("six.moves.")]
-     for name in d:
-         del sys.modules[name]
-
-Supported renames:
-
-+------------------------------+-------------------------------------+---------------------------------------+
-| Name                         | Python 2 name                       | Python 3 name                         |
-+==============================+=====================================+=======================================+
-| ``builtins``                 | :mod:`py2:__builtin__`              | :mod:`py3:builtins`                   |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``configparser``             | :mod:`py2:ConfigParser`             | :mod:`py3:configparser`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``copyreg``                  | :mod:`py2:copy_reg`                 | :mod:`py3:copyreg`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``cPickle``                  | :mod:`py2:cPickle`                  | :mod:`py3:pickle`                     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``cStringIO``                | :func:`py2:cStringIO.StringIO`      | :class:`py3:io.StringIO`              |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``collections_abc``          | :mod:`py2:collections`              | :mod:`py3:collections.abc` (3.3+)     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``dbm_gnu``                  | :mod:`py2:gdbm`                     | :mod:`py3:dbm.gnu`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``dbm_ndbm``                 | :mod:`py2:dbm`                      | :mod:`py3:dbm.ndbm`                   |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``_dummy_thread``            | :mod:`py2:dummy_thread`             | :mod:`py3:_dummy_thread` (< 3.9)      |
-|                              |                                     | :mod:`py3:_thread` (3.9+)             |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``email_mime_base``          | :mod:`py2:email.MIMEBase`           | :mod:`py3:email.mime.base`            |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``email_mime_image``         | :mod:`py2:email.MIMEImage`          | :mod:`py3:email.mime.image`           |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``email_mime_multipart``     | :mod:`py2:email.MIMEMultipart`      | :mod:`py3:email.mime.multipart`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``email_mime_nonmultipart``  | :mod:`py2:email.MIMENonMultipart`   | :mod:`py3:email.mime.nonmultipart`    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``email_mime_text``          | :mod:`py2:email.MIMEText`           | :mod:`py3:email.mime.text`            |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``filter``                   | :func:`py2:itertools.ifilter`       | :func:`py3:filter`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``filterfalse``              | :func:`py2:itertools.ifilterfalse`  | :func:`py3:itertools.filterfalse`     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``getcwd``                   | :func:`py2:os.getcwdu`              | :func:`py3:os.getcwd`                 |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``getcwdb``                  | :func:`py2:os.getcwd`               | :func:`py3:os.getcwdb`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``getoutput``                | :func:`py2:commands.getoutput`      | :func:`py3:subprocess.getoutput`      |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``http_cookiejar``           | :mod:`py2:cookielib`                | :mod:`py3:http.cookiejar`             |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``http_cookies``             | :mod:`py2:Cookie`                   | :mod:`py3:http.cookies`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``html_entities``            | :mod:`py2:htmlentitydefs`           | :mod:`py3:html.entities`              |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``html_parser``              | :mod:`py2:HTMLParser`               | :mod:`py3:html.parser`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``http_client``              | :mod:`py2:httplib`                  | :mod:`py3:http.client`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``BaseHTTPServer``           | :mod:`py2:BaseHTTPServer`           | :mod:`py3:http.server`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``CGIHTTPServer``            | :mod:`py2:CGIHTTPServer`            | :mod:`py3:http.server`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``SimpleHTTPServer``         | :mod:`py2:SimpleHTTPServer`         | :mod:`py3:http.server`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``input``                    | :func:`py2:raw_input`               | :func:`py3:input`                     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``intern``                   | :func:`py2:intern`                  | :func:`py3:sys.intern`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``map``                      | :func:`py2:itertools.imap`          | :func:`py3:map`                       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``queue``                    | :mod:`py2:Queue`                    | :mod:`py3:queue`                      |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``range``                    | :func:`py2:xrange`                  | :func:`py3:range`                     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``reduce``                   | :func:`py2:reduce`                  | :func:`py3:functools.reduce`          |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``reload_module``            | :func:`py2:reload`                  | :func:`py3:imp.reload`,               |
-|                              |                                     | :func:`py3:importlib.reload`          |
-|                              |                                     | on Python 3.4+                        |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``reprlib``                  | :mod:`py2:repr`                     | :mod:`py3:reprlib`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``shlex_quote``              | :mod:`py2:pipes.quote`              | :mod:`py3:shlex.quote`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``socketserver``             | :mod:`py2:SocketServer`             | :mod:`py3:socketserver`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``_thread``                  | :mod:`py2:thread`                   | :mod:`py3:_thread`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter``                  | :mod:`py2:Tkinter`                  | :mod:`py3:tkinter`                    |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_dialog``           | :mod:`py2:Dialog`                   | :mod:`py3:tkinter.dialog`             |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_filedialog``       | :mod:`py2:FileDialog`               | :mod:`py3:tkinter.FileDialog`         |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_scrolledtext``     | :mod:`py2:ScrolledText`             | :mod:`py3:tkinter.scrolledtext`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_simpledialog``     | :mod:`py2:SimpleDialog`             | :mod:`py3:tkinter.simpledialog`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_ttk``              | :mod:`py2:ttk`                      | :mod:`py3:tkinter.ttk`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_tix``              | :mod:`py2:Tix`                      | :mod:`py3:tkinter.tix`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_constants``        | :mod:`py2:Tkconstants`              | :mod:`py3:tkinter.constants`          |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_dnd``              | :mod:`py2:Tkdnd`                    | :mod:`py3:tkinter.dnd`                |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_colorchooser``     | :mod:`py2:tkColorChooser`           | :mod:`py3:tkinter.colorchooser`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_commondialog``     | :mod:`py2:tkCommonDialog`           | :mod:`py3:tkinter.commondialog`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_tkfiledialog``     | :mod:`py2:tkFileDialog`             | :mod:`py3:tkinter.filedialog`         |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_font``             | :mod:`py2:tkFont`                   | :mod:`py3:tkinter.font`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_messagebox``       | :mod:`py2:tkMessageBox`             | :mod:`py3:tkinter.messagebox`         |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``tkinter_tksimpledialog``   | :mod:`py2:tkSimpleDialog`           | :mod:`py3:tkinter.simpledialog`       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib.parse``             | See :mod:`six.moves.urllib.parse`   | :mod:`py3:urllib.parse`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib.error``             | See :mod:`six.moves.urllib.error`   | :mod:`py3:urllib.error`               |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib.request``           | See :mod:`six.moves.urllib.request` | :mod:`py3:urllib.request`             |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib.response``          | See :mod:`six.moves.urllib.response`| :mod:`py3:urllib.response`            |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib.robotparser``       | :mod:`py2:robotparser`              | :mod:`py3:urllib.robotparser`         |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``urllib_robotparser``       | :mod:`py2:robotparser`              | :mod:`py3:urllib.robotparser`         |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``UserDict``                 | :class:`py2:UserDict.UserDict`      | :class:`py3:collections.UserDict`     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``UserList``                 | :class:`py2:UserList.UserList`      | :class:`py3:collections.UserList`     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``UserString``               | :class:`py2:UserString.UserString`  | :class:`py3:collections.UserString`   |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``winreg``                   | :mod:`py2:_winreg`                  | :mod:`py3:winreg`                     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``xmlrpc_client``            | :mod:`py2:xmlrpclib`                | :mod:`py3:xmlrpc.client`              |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``xmlrpc_server``            | :mod:`py2:SimpleXMLRPCServer`       | :mod:`py3:xmlrpc.server`              |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``xrange``                   | :func:`py2:xrange`                  | :func:`py3:range`                     |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``zip``                      | :func:`py2:itertools.izip`          | :func:`py3:zip`                       |
-+------------------------------+-------------------------------------+---------------------------------------+
-| ``zip_longest``              | :func:`py2:itertools.izip_longest`  | :func:`py3:itertools.zip_longest`     |
-+------------------------------+-------------------------------------+---------------------------------------+
-
-urllib parse
-<<<<<<<<<<<<
-
-.. module:: six.moves.urllib.parse
-   :synopsis: Stuff from :mod:`py2:urlparse` and :mod:`py2:urllib` in Python 2 and :mod:`py3:urllib.parse` in Python 3
-
-Contains functions from Python 3's :mod:`py3:urllib.parse` and Python 2's:
-
-:mod:`py2:urlparse`:
-
-* :func:`py2:urlparse.ParseResult`
-* :func:`py2:urlparse.SplitResult`
-* :func:`py2:urlparse.urlparse`
-* :func:`py2:urlparse.urlunparse`
-* :func:`py2:urlparse.parse_qs`
-* :func:`py2:urlparse.parse_qsl`
-* :func:`py2:urlparse.urljoin`
-* :func:`py2:urlparse.urldefrag`
-* :func:`py2:urlparse.urlsplit`
-* :func:`py2:urlparse.urlunsplit`
-* :func:`py2:urlparse.splitquery`
-* :func:`py2:urlparse.uses_fragment`
-* :func:`py2:urlparse.uses_netloc`
-* :func:`py2:urlparse.uses_params`
-* :func:`py2:urlparse.uses_query`
-* :func:`py2:urlparse.uses_relative`
-
-and :mod:`py2:urllib`:
-
-* :func:`py2:urllib.quote`
-* :func:`py2:urllib.quote_plus`
-* :func:`py2:urllib.splittag`
-* :func:`py2:urllib.splituser`
-* :func:`py2:urllib.splitvalue`
-* :func:`py2:urllib.unquote` (also exposed as :func:`py3:urllib.parse.unquote_to_bytes`)
-* :func:`py2:urllib.unquote_plus`
-* :func:`py2:urllib.urlencode`
-
-
-urllib error
-<<<<<<<<<<<<
-
-.. module:: six.moves.urllib.error
-   :synopsis: Stuff from :mod:`py2:urllib` and :mod:`py2:urllib2` in Python 2 and :mod:`py3:urllib.error` in Python 3
-
-Contains exceptions from Python 3's :mod:`py3:urllib.error` and Python 2's:
-
-:mod:`py2:urllib`:
-
-* :exc:`py2:urllib.ContentTooShortError`
-
-and :mod:`py2:urllib2`:
-
-* :exc:`py2:urllib2.URLError`
-* :exc:`py2:urllib2.HTTPError`
-
-
-urllib request
-<<<<<<<<<<<<<<
-
-.. module:: six.moves.urllib.request
-   :synopsis: Stuff from :mod:`py2:urllib` and :mod:`py2:urllib2` in Python 2 and :mod:`py3:urllib.request` in Python 3
-
-Contains items from Python 3's :mod:`py3:urllib.request` and Python 2's:
-
-:mod:`py2:urllib`:
-
-* :func:`py2:urllib.pathname2url`
-* :func:`py2:urllib.url2pathname`
-* :func:`py2:urllib.getproxies`
-* :func:`py2:urllib.urlretrieve`
-* :func:`py2:urllib.urlcleanup`
-* :class:`py2:urllib.URLopener`
-* :class:`py2:urllib.FancyURLopener`
-* :func:`py2:urllib.proxy_bypass`
-
-and :mod:`py2:urllib2`:
-
-* :func:`py2:urllib2.urlopen`
-* :func:`py2:urllib2.install_opener`
-* :func:`py2:urllib2.build_opener`
-* :func:`py2:urllib2.parse_http_list`
-* :func:`py2:urllib2.parse_keqv_list`
-* :class:`py2:urllib2.Request`
-* :class:`py2:urllib2.OpenerDirector`
-* :class:`py2:urllib2.HTTPDefaultErrorHandler`
-* :class:`py2:urllib2.HTTPRedirectHandler`
-* :class:`py2:urllib2.HTTPCookieProcessor`
-* :class:`py2:urllib2.ProxyHandler`
-* :class:`py2:urllib2.BaseHandler`
-* :class:`py2:urllib2.HTTPPasswordMgr`
-* :class:`py2:urllib2.HTTPPasswordMgrWithDefaultRealm`
-* :class:`py2:urllib2.AbstractBasicAuthHandler`
-* :class:`py2:urllib2.HTTPBasicAuthHandler`
-* :class:`py2:urllib2.ProxyBasicAuthHandler`
-* :class:`py2:urllib2.AbstractDigestAuthHandler`
-* :class:`py2:urllib2.HTTPDigestAuthHandler`
-* :class:`py2:urllib2.ProxyDigestAuthHandler`
-* :class:`py2:urllib2.HTTPHandler`
-* :class:`py2:urllib2.HTTPSHandler`
-* :class:`py2:urllib2.FileHandler`
-* :class:`py2:urllib2.FTPHandler`
-* :class:`py2:urllib2.CacheFTPHandler`
-* :class:`py2:urllib2.UnknownHandler`
-* :class:`py2:urllib2.HTTPErrorProcessor`
-
-
-urllib response
-<<<<<<<<<<<<<<<
-
-.. module:: six.moves.urllib.response
-   :synopsis: Stuff from :mod:`py2:urllib` in Python 2 and :mod:`py3:urllib.response` in Python 3
-
-Contains classes from Python 3's :mod:`py3:urllib.response` and Python 2's:
-
-:mod:`py2:urllib`:
-
-* :class:`py2:urllib.addbase`
-* :class:`py2:urllib.addclosehook`
-* :class:`py2:urllib.addinfo`
-* :class:`py2:urllib.addinfourl`
-
-
-Advanced - Customizing renames
-<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
-
-.. currentmodule:: six
-
-It is possible to add additional names to the :mod:`six.moves` namespace.
-
-
-.. function:: add_move(item)
-
-   Add *item* to the :mod:`six.moves` mapping.  *item* should be a
-   :class:`MovedAttribute` or :class:`MovedModule` instance.
-
-
-.. function:: remove_move(name)
-
-   Remove the :mod:`six.moves` mapping called *name*.  *name* should be a
-   string.
-
-
-Instances of the following classes can be passed to :func:`add_move`.  Neither
-have any public members.
-
-
-.. class:: MovedModule(name, old_mod, new_mod)
-
-   Create a mapping for :mod:`six.moves` called *name* that references different
-   modules in Python 2 and 3.  *old_mod* is the name of the Python 2 module.
-   *new_mod* is the name of the Python 3 module.
-
-
-.. class:: MovedAttribute(name, old_mod, new_mod, old_attr=None, new_attr=None)
-
-   Create a mapping for :mod:`six.moves` called *name* that references different
-   attributes in Python 2 and 3.  *old_mod* is the name of the Python 2 module.
-   *new_mod* is the name of the Python 3 module.  If *new_attr* is not given, it
-   defaults to *old_attr*.  If neither is given, they both default to *name*.
diff --git a/third_party/py/six/setup.cfg b/third_party/py/six/setup.cfg
deleted file mode 100644
index 317e016..0000000
--- a/third_party/py/six/setup.cfg
+++ /dev/null
@@ -1,20 +0,0 @@
-[bdist_wheel]
-universal = 1
-
-[flake8]
-max-line-length = 100
-ignore = F821
-
-[metadata]
-license_file = LICENSE
-
-[tool:pytest]
-minversion=2.2.0
-pep8ignore =
-    documentation/*.py ALL
-    test_six.py ALL
-
-flakes-ignore =
-    documentation/*.py ALL
-    test_six.py ALL
-    six.py UndefinedName
diff --git a/third_party/py/six/setup.py b/third_party/py/six/setup.py
deleted file mode 100644
index d90958b..0000000
--- a/third_party/py/six/setup.py
+++ /dev/null
@@ -1,58 +0,0 @@
-# Copyright (c) 2010-2020 Benjamin Peterson
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-from __future__ import with_statement
-
-# Six is a dependency of setuptools, so using setuptools creates a
-# circular dependency when building a Python stack from source. We
-# therefore allow falling back to distutils to install six.
-try:
-    from setuptools import setup
-except ImportError:
-    from distutils.core import setup
-
-import six
-
-six_classifiers = [
-    "Development Status :: 5 - Production/Stable",
-    "Programming Language :: Python :: 2",
-    "Programming Language :: Python :: 3",
-    "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
-    "Topic :: Software Development :: Libraries",
-    "Topic :: Utilities",
-]
-
-with open("README.rst", "r") as fp:
-    six_long_description = fp.read()
-
-setup(name="six",
-      version=six.__version__,
-      author="Benjamin Peterson",
-      author_email="benjamin@python.org",
-      url="https://github.com/benjaminp/six",
-      tests_require=["pytest"],
-      py_modules=["six"],
-      description="Python 2 and 3 compatibility utilities",
-      long_description=six_long_description,
-      license="MIT",
-      classifiers=six_classifiers,
-      python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*",
-      )
diff --git a/third_party/py/six/six.py b/third_party/py/six/six.py
deleted file mode 100644
index 4e15675..0000000
--- a/third_party/py/six/six.py
+++ /dev/null
@@ -1,998 +0,0 @@
-# Copyright (c) 2010-2020 Benjamin Peterson
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-"""Utilities for writing code that runs on Python 2 and 3"""
-
-from __future__ import absolute_import
-
-import functools
-import itertools
-import operator
-import sys
-import types
-
-__author__ = "Benjamin Peterson <benjamin@python.org>"
-__version__ = "1.16.0"
-
-
-# Useful for very coarse version differentiation.
-PY2 = sys.version_info[0] == 2
-PY3 = sys.version_info[0] == 3
-PY34 = sys.version_info[0:2] >= (3, 4)
-
-if PY3:
-    string_types = str,
-    integer_types = int,
-    class_types = type,
-    text_type = str
-    binary_type = bytes
-
-    MAXSIZE = sys.maxsize
-else:
-    string_types = basestring,
-    integer_types = (int, long)
-    class_types = (type, types.ClassType)
-    text_type = unicode
-    binary_type = str
-
-    if sys.platform.startswith("java"):
-        # Jython always uses 32 bits.
-        MAXSIZE = int((1 << 31) - 1)
-    else:
-        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
-        class X(object):
-
-            def __len__(self):
-                return 1 << 31
-        try:
-            len(X())
-        except OverflowError:
-            # 32-bit
-            MAXSIZE = int((1 << 31) - 1)
-        else:
-            # 64-bit
-            MAXSIZE = int((1 << 63) - 1)
-        del X
-
-if PY34:
-    from importlib.util import spec_from_loader
-else:
-    spec_from_loader = None
-
-
-def _add_doc(func, doc):
-    """Add documentation to a function."""
-    func.__doc__ = doc
-
-
-def _import_module(name):
-    """Import module, returning the module after the last dot."""
-    __import__(name)
-    return sys.modules[name]
-
-
-class _LazyDescr(object):
-
-    def __init__(self, name):
-        self.name = name
-
-    def __get__(self, obj, tp):
-        result = self._resolve()
-        setattr(obj, self.name, result)  # Invokes __set__.
-        try:
-            # This is a bit ugly, but it avoids running this again by
-            # removing this descriptor.
-            delattr(obj.__class__, self.name)
-        except AttributeError:
-            pass
-        return result
-
-
-class MovedModule(_LazyDescr):
-
-    def __init__(self, name, old, new=None):
-        super(MovedModule, self).__init__(name)
-        if PY3:
-            if new is None:
-                new = name
-            self.mod = new
-        else:
-            self.mod = old
-
-    def _resolve(self):
-        return _import_module(self.mod)
-
-    def __getattr__(self, attr):
-        _module = self._resolve()
-        value = getattr(_module, attr)
-        setattr(self, attr, value)
-        return value
-
-
-class _LazyModule(types.ModuleType):
-
-    def __init__(self, name):
-        super(_LazyModule, self).__init__(name)
-        self.__doc__ = self.__class__.__doc__
-
-    def __dir__(self):
-        attrs = ["__doc__", "__name__"]
-        attrs += [attr.name for attr in self._moved_attributes]
-        return attrs
-
-    # Subclasses should override this
-    _moved_attributes = []
-
-
-class MovedAttribute(_LazyDescr):
-
-    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
-        super(MovedAttribute, self).__init__(name)
-        if PY3:
-            if new_mod is None:
-                new_mod = name
-            self.mod = new_mod
-            if new_attr is None:
-                if old_attr is None:
-                    new_attr = name
-                else:
-                    new_attr = old_attr
-            self.attr = new_attr
-        else:
-            self.mod = old_mod
-            if old_attr is None:
-                old_attr = name
-            self.attr = old_attr
-
-    def _resolve(self):
-        module = _import_module(self.mod)
-        return getattr(module, self.attr)
-
-
-class _SixMetaPathImporter(object):
-
-    """
-    A meta path importer to import six.moves and its submodules.
-
-    This class implements a PEP302 finder and loader. It should be compatible
-    with Python 2.5 and all existing versions of Python3
-    """
-
-    def __init__(self, six_module_name):
-        self.name = six_module_name
-        self.known_modules = {}
-
-    def _add_module(self, mod, *fullnames):
-        for fullname in fullnames:
-            self.known_modules[self.name + "." + fullname] = mod
-
-    def _get_module(self, fullname):
-        return self.known_modules[self.name + "." + fullname]
-
-    def find_module(self, fullname, path=None):
-        if fullname in self.known_modules:
-            return self
-        return None
-
-    def find_spec(self, fullname, path, target=None):
-        if fullname in self.known_modules:
-            return spec_from_loader(fullname, self)
-        return None
-
-    def __get_module(self, fullname):
-        try:
-            return self.known_modules[fullname]
-        except KeyError:
-            raise ImportError("This loader does not know module " + fullname)
-
-    def load_module(self, fullname):
-        try:
-            # in case of a reload
-            return sys.modules[fullname]
-        except KeyError:
-            pass
-        mod = self.__get_module(fullname)
-        if isinstance(mod, MovedModule):
-            mod = mod._resolve()
-        else:
-            mod.__loader__ = self
-        sys.modules[fullname] = mod
-        return mod
-
-    def is_package(self, fullname):
-        """
-        Return true, if the named module is a package.
-
-        We need this method to get correct spec objects with
-        Python 3.4 (see PEP451)
-        """
-        return hasattr(self.__get_module(fullname), "__path__")
-
-    def get_code(self, fullname):
-        """Return None
-
-        Required, if is_package is implemented"""
-        self.__get_module(fullname)  # eventually raises ImportError
-        return None
-    get_source = get_code  # same as get_code
-
-    def create_module(self, spec):
-        return self.load_module(spec.name)
-
-    def exec_module(self, module):
-        pass
-
-_importer = _SixMetaPathImporter(__name__)
-
-
-class _MovedItems(_LazyModule):
-
-    """Lazy loading of moved objects"""
-    __path__ = []  # mark as package
-
-
-_moved_attributes = [
-    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
-    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
-    MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
-    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
-    MovedAttribute("intern", "__builtin__", "sys"),
-    MovedAttribute("map", "itertools", "builtins", "imap", "map"),
-    MovedAttribute("getcwd", "os", "os", "getcwdu", "getcwd"),
-    MovedAttribute("getcwdb", "os", "os", "getcwd", "getcwdb"),
-    MovedAttribute("getoutput", "commands", "subprocess"),
-    MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
-    MovedAttribute("reload_module", "__builtin__", "importlib" if PY34 else "imp", "reload"),
-    MovedAttribute("reduce", "__builtin__", "functools"),
-    MovedAttribute("shlex_quote", "pipes", "shlex", "quote"),
-    MovedAttribute("StringIO", "StringIO", "io"),
-    MovedAttribute("UserDict", "UserDict", "collections"),
-    MovedAttribute("UserList", "UserList", "collections"),
-    MovedAttribute("UserString", "UserString", "collections"),
-    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
-    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
-    MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
-    MovedModule("builtins", "__builtin__"),
-    MovedModule("configparser", "ConfigParser"),
-    MovedModule("collections_abc", "collections", "collections.abc" if sys.version_info >= (3, 3) else "collections"),
-    MovedModule("copyreg", "copy_reg"),
-    MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
-    MovedModule("dbm_ndbm", "dbm", "dbm.ndbm"),
-    MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread" if sys.version_info < (3, 9) else "_thread"),
-    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
-    MovedModule("http_cookies", "Cookie", "http.cookies"),
-    MovedModule("html_entities", "htmlentitydefs", "html.entities"),
-    MovedModule("html_parser", "HTMLParser", "html.parser"),
-    MovedModule("http_client", "httplib", "http.client"),
-    MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
-    MovedModule("email_mime_image", "email.MIMEImage", "email.mime.image"),
-    MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
-    MovedModule("email_mime_nonmultipart", "email.MIMENonMultipart", "email.mime.nonmultipart"),
-    MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
-    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
-    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
-    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
-    MovedModule("cPickle", "cPickle", "pickle"),
-    MovedModule("queue", "Queue"),
-    MovedModule("reprlib", "repr"),
-    MovedModule("socketserver", "SocketServer"),
-    MovedModule("_thread", "thread", "_thread"),
-    MovedModule("tkinter", "Tkinter"),
-    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
-    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
-    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
-    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
-    MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
-    MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
-    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
-    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
-    MovedModule("tkinter_colorchooser", "tkColorChooser",
-                "tkinter.colorchooser"),
-    MovedModule("tkinter_commondialog", "tkCommonDialog",
-                "tkinter.commondialog"),
-    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
-    MovedModule("tkinter_font", "tkFont", "tkinter.font"),
-    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
-    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
-                "tkinter.simpledialog"),
-    MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
-    MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
-    MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
-    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
-    MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
-    MovedModule("xmlrpc_server", "SimpleXMLRPCServer", "xmlrpc.server"),
-]
-# Add windows specific modules.
-if sys.platform == "win32":
-    _moved_attributes += [
-        MovedModule("winreg", "_winreg"),
-    ]
-
-for attr in _moved_attributes:
-    setattr(_MovedItems, attr.name, attr)
-    if isinstance(attr, MovedModule):
-        _importer._add_module(attr, "moves." + attr.name)
-del attr
-
-_MovedItems._moved_attributes = _moved_attributes
-
-moves = _MovedItems(__name__ + ".moves")
-_importer._add_module(moves, "moves")
-
-
-class Module_six_moves_urllib_parse(_LazyModule):
-
-    """Lazy loading of moved objects in six.moves.urllib_parse"""
-
-
-_urllib_parse_moved_attributes = [
-    MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
-    MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
-    MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
-    MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
-    MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
-    MovedAttribute("urljoin", "urlparse", "urllib.parse"),
-    MovedAttribute("urlparse", "urlparse", "urllib.parse"),
-    MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
-    MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
-    MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
-    MovedAttribute("quote", "urllib", "urllib.parse"),
-    MovedAttribute("quote_plus", "urllib", "urllib.parse"),
-    MovedAttribute("unquote", "urllib", "urllib.parse"),
-    MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
-    MovedAttribute("unquote_to_bytes", "urllib", "urllib.parse", "unquote", "unquote_to_bytes"),
-    MovedAttribute("urlencode", "urllib", "urllib.parse"),
-    MovedAttribute("splitquery", "urllib", "urllib.parse"),
-    MovedAttribute("splittag", "urllib", "urllib.parse"),
-    MovedAttribute("splituser", "urllib", "urllib.parse"),
-    MovedAttribute("splitvalue", "urllib", "urllib.parse"),
-    MovedAttribute("uses_fragment", "urlparse", "urllib.parse"),
-    MovedAttribute("uses_netloc", "urlparse", "urllib.parse"),
-    MovedAttribute("uses_params", "urlparse", "urllib.parse"),
-    MovedAttribute("uses_query", "urlparse", "urllib.parse"),
-    MovedAttribute("uses_relative", "urlparse", "urllib.parse"),
-]
-for attr in _urllib_parse_moved_attributes:
-    setattr(Module_six_moves_urllib_parse, attr.name, attr)
-del attr
-
-Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
-
-_importer._add_module(Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse"),
-                      "moves.urllib_parse", "moves.urllib.parse")
-
-
-class Module_six_moves_urllib_error(_LazyModule):
-
-    """Lazy loading of moved objects in six.moves.urllib_error"""
-
-
-_urllib_error_moved_attributes = [
-    MovedAttribute("URLError", "urllib2", "urllib.error"),
-    MovedAttribute("HTTPError", "urllib2", "urllib.error"),
-    MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
-]
-for attr in _urllib_error_moved_attributes:
-    setattr(Module_six_moves_urllib_error, attr.name, attr)
-del attr
-
-Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
-
-_importer._add_module(Module_six_moves_urllib_error(__name__ + ".moves.urllib.error"),
-                      "moves.urllib_error", "moves.urllib.error")
-
-
-class Module_six_moves_urllib_request(_LazyModule):
-
-    """Lazy loading of moved objects in six.moves.urllib_request"""
-
-
-_urllib_request_moved_attributes = [
-    MovedAttribute("urlopen", "urllib2", "urllib.request"),
-    MovedAttribute("install_opener", "urllib2", "urllib.request"),
-    MovedAttribute("build_opener", "urllib2", "urllib.request"),
-    MovedAttribute("pathname2url", "urllib", "urllib.request"),
-    MovedAttribute("url2pathname", "urllib", "urllib.request"),
-    MovedAttribute("getproxies", "urllib", "urllib.request"),
-    MovedAttribute("Request", "urllib2", "urllib.request"),
-    MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
-    MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
-    MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
-    MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
-    MovedAttribute("FileHandler", "urllib2", "urllib.request"),
-    MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
-    MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
-    MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
-    MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
-    MovedAttribute("urlretrieve", "urllib", "urllib.request"),
-    MovedAttribute("urlcleanup", "urllib", "urllib.request"),
-    MovedAttribute("URLopener", "urllib", "urllib.request"),
-    MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
-    MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
-    MovedAttribute("parse_http_list", "urllib2", "urllib.request"),
-    MovedAttribute("parse_keqv_list", "urllib2", "urllib.request"),
-]
-for attr in _urllib_request_moved_attributes:
-    setattr(Module_six_moves_urllib_request, attr.name, attr)
-del attr
-
-Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
-
-_importer._add_module(Module_six_moves_urllib_request(__name__ + ".moves.urllib.request"),
-                      "moves.urllib_request", "moves.urllib.request")
-
-
-class Module_six_moves_urllib_response(_LazyModule):
-
-    """Lazy loading of moved objects in six.moves.urllib_response"""
-
-
-_urllib_response_moved_attributes = [
-    MovedAttribute("addbase", "urllib", "urllib.response"),
-    MovedAttribute("addclosehook", "urllib", "urllib.response"),
-    MovedAttribute("addinfo", "urllib", "urllib.response"),
-    MovedAttribute("addinfourl", "urllib", "urllib.response"),
-]
-for attr in _urllib_response_moved_attributes:
-    setattr(Module_six_moves_urllib_response, attr.name, attr)
-del attr
-
-Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
-
-_importer._add_module(Module_six_moves_urllib_response(__name__ + ".moves.urllib.response"),
-                      "moves.urllib_response", "moves.urllib.response")
-
-
-class Module_six_moves_urllib_robotparser(_LazyModule):
-
-    """Lazy loading of moved objects in six.moves.urllib_robotparser"""
-
-
-_urllib_robotparser_moved_attributes = [
-    MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
-]
-for attr in _urllib_robotparser_moved_attributes:
-    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
-del attr
-
-Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
-
-_importer._add_module(Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser"),
-                      "moves.urllib_robotparser", "moves.urllib.robotparser")
-
-
-class Module_six_moves_urllib(types.ModuleType):
-
-    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
-    __path__ = []  # mark as package
-    parse = _importer._get_module("moves.urllib_parse")
-    error = _importer._get_module("moves.urllib_error")
-    request = _importer._get_module("moves.urllib_request")
-    response = _importer._get_module("moves.urllib_response")
-    robotparser = _importer._get_module("moves.urllib_robotparser")
-
-    def __dir__(self):
-        return ['parse', 'error', 'request', 'response', 'robotparser']
-
-_importer._add_module(Module_six_moves_urllib(__name__ + ".moves.urllib"),
-                      "moves.urllib")
-
-
-def add_move(move):
-    """Add an item to six.moves."""
-    setattr(_MovedItems, move.name, move)
-
-
-def remove_move(name):
-    """Remove item from six.moves."""
-    try:
-        delattr(_MovedItems, name)
-    except AttributeError:
-        try:
-            del moves.__dict__[name]
-        except KeyError:
-            raise AttributeError("no such move, %r" % (name,))
-
-
-if PY3:
-    _meth_func = "__func__"
-    _meth_self = "__self__"
-
-    _func_closure = "__closure__"
-    _func_code = "__code__"
-    _func_defaults = "__defaults__"
-    _func_globals = "__globals__"
-else:
-    _meth_func = "im_func"
-    _meth_self = "im_self"
-
-    _func_closure = "func_closure"
-    _func_code = "func_code"
-    _func_defaults = "func_defaults"
-    _func_globals = "func_globals"
-
-
-try:
-    advance_iterator = next
-except NameError:
-    def advance_iterator(it):
-        return it.next()
-next = advance_iterator
-
-
-try:
-    callable = callable
-except NameError:
-    def callable(obj):
-        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
-
-
-if PY3:
-    def get_unbound_function(unbound):
-        return unbound
-
-    create_bound_method = types.MethodType
-
-    def create_unbound_method(func, cls):
-        return func
-
-    Iterator = object
-else:
-    def get_unbound_function(unbound):
-        return unbound.im_func
-
-    def create_bound_method(func, obj):
-        return types.MethodType(func, obj, obj.__class__)
-
-    def create_unbound_method(func, cls):
-        return types.MethodType(func, None, cls)
-
-    class Iterator(object):
-
-        def next(self):
-            return type(self).__next__(self)
-
-    callable = callable
-_add_doc(get_unbound_function,
-         """Get the function out of a possibly unbound function""")
-
-
-get_method_function = operator.attrgetter(_meth_func)
-get_method_self = operator.attrgetter(_meth_self)
-get_function_closure = operator.attrgetter(_func_closure)
-get_function_code = operator.attrgetter(_func_code)
-get_function_defaults = operator.attrgetter(_func_defaults)
-get_function_globals = operator.attrgetter(_func_globals)
-
-
-if PY3:
-    def iterkeys(d, **kw):
-        return iter(d.keys(**kw))
-
-    def itervalues(d, **kw):
-        return iter(d.values(**kw))
-
-    def iteritems(d, **kw):
-        return iter(d.items(**kw))
-
-    def iterlists(d, **kw):
-        return iter(d.lists(**kw))
-
-    viewkeys = operator.methodcaller("keys")
-
-    viewvalues = operator.methodcaller("values")
-
-    viewitems = operator.methodcaller("items")
-else:
-    def iterkeys(d, **kw):
-        return d.iterkeys(**kw)
-
-    def itervalues(d, **kw):
-        return d.itervalues(**kw)
-
-    def iteritems(d, **kw):
-        return d.iteritems(**kw)
-
-    def iterlists(d, **kw):
-        return d.iterlists(**kw)
-
-    viewkeys = operator.methodcaller("viewkeys")
-
-    viewvalues = operator.methodcaller("viewvalues")
-
-    viewitems = operator.methodcaller("viewitems")
-
-_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
-_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
-_add_doc(iteritems,
-         "Return an iterator over the (key, value) pairs of a dictionary.")
-_add_doc(iterlists,
-         "Return an iterator over the (key, [values]) pairs of a dictionary.")
-
-
-if PY3:
-    def b(s):
-        return s.encode("latin-1")
-
-    def u(s):
-        return s
-    unichr = chr
-    import struct
-    int2byte = struct.Struct(">B").pack
-    del struct
-    byte2int = operator.itemgetter(0)
-    indexbytes = operator.getitem
-    iterbytes = iter
-    import io
-    StringIO = io.StringIO
-    BytesIO = io.BytesIO
-    del io
-    _assertCountEqual = "assertCountEqual"
-    if sys.version_info[1] <= 1:
-        _assertRaisesRegex = "assertRaisesRegexp"
-        _assertRegex = "assertRegexpMatches"
-        _assertNotRegex = "assertNotRegexpMatches"
-    else:
-        _assertRaisesRegex = "assertRaisesRegex"
-        _assertRegex = "assertRegex"
-        _assertNotRegex = "assertNotRegex"
-else:
-    def b(s):
-        return s
-    # Workaround for standalone backslash
-
-    def u(s):
-        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
-    unichr = unichr
-    int2byte = chr
-
-    def byte2int(bs):
-        return ord(bs[0])
-
-    def indexbytes(buf, i):
-        return ord(buf[i])
-    iterbytes = functools.partial(itertools.imap, ord)
-    import StringIO
-    StringIO = BytesIO = StringIO.StringIO
-    _assertCountEqual = "assertItemsEqual"
-    _assertRaisesRegex = "assertRaisesRegexp"
-    _assertRegex = "assertRegexpMatches"
-    _assertNotRegex = "assertNotRegexpMatches"
-_add_doc(b, """Byte literal""")
-_add_doc(u, """Text literal""")
-
-
-def assertCountEqual(self, *args, **kwargs):
-    return getattr(self, _assertCountEqual)(*args, **kwargs)
-
-
-def assertRaisesRegex(self, *args, **kwargs):
-    return getattr(self, _assertRaisesRegex)(*args, **kwargs)
-
-
-def assertRegex(self, *args, **kwargs):
-    return getattr(self, _assertRegex)(*args, **kwargs)
-
-
-def assertNotRegex(self, *args, **kwargs):
-    return getattr(self, _assertNotRegex)(*args, **kwargs)
-
-
-if PY3:
-    exec_ = getattr(moves.builtins, "exec")
-
-    def reraise(tp, value, tb=None):
-        try:
-            if value is None:
-                value = tp()
-            if value.__traceback__ is not tb:
-                raise value.with_traceback(tb)
-            raise value
-        finally:
-            value = None
-            tb = None
-
-else:
-    def exec_(_code_, _globs_=None, _locs_=None):
-        """Execute code in a namespace."""
-        if _globs_ is None:
-            frame = sys._getframe(1)
-            _globs_ = frame.f_globals
-            if _locs_ is None:
-                _locs_ = frame.f_locals
-            del frame
-        elif _locs_ is None:
-            _locs_ = _globs_
-        exec("""exec _code_ in _globs_, _locs_""")
-
-    exec_("""def reraise(tp, value, tb=None):
-    try:
-        raise tp, value, tb
-    finally:
-        tb = None
-""")
-
-
-if sys.version_info[:2] > (3,):
-    exec_("""def raise_from(value, from_value):
-    try:
-        raise value from from_value
-    finally:
-        value = None
-""")
-else:
-    def raise_from(value, from_value):
-        raise value
-
-
-print_ = getattr(moves.builtins, "print", None)
-if print_ is None:
-    def print_(*args, **kwargs):
-        """The new-style print function for Python 2.4 and 2.5."""
-        fp = kwargs.pop("file", sys.stdout)
-        if fp is None:
-            return
-
-        def write(data):
-            if not isinstance(data, basestring):
-                data = str(data)
-            # If the file has an encoding, encode unicode with it.
-            if (isinstance(fp, file) and
-                    isinstance(data, unicode) and
-                    fp.encoding is not None):
-                errors = getattr(fp, "errors", None)
-                if errors is None:
-                    errors = "strict"
-                data = data.encode(fp.encoding, errors)
-            fp.write(data)
-        want_unicode = False
-        sep = kwargs.pop("sep", None)
-        if sep is not None:
-            if isinstance(sep, unicode):
-                want_unicode = True
-            elif not isinstance(sep, str):
-                raise TypeError("sep must be None or a string")
-        end = kwargs.pop("end", None)
-        if end is not None:
-            if isinstance(end, unicode):
-                want_unicode = True
-            elif not isinstance(end, str):
-                raise TypeError("end must be None or a string")
-        if kwargs:
-            raise TypeError("invalid keyword arguments to print()")
-        if not want_unicode:
-            for arg in args:
-                if isinstance(arg, unicode):
-                    want_unicode = True
-                    break
-        if want_unicode:
-            newline = unicode("\n")
-            space = unicode(" ")
-        else:
-            newline = "\n"
-            space = " "
-        if sep is None:
-            sep = space
-        if end is None:
-            end = newline
-        for i, arg in enumerate(args):
-            if i:
-                write(sep)
-            write(arg)
-        write(end)
-if sys.version_info[:2] < (3, 3):
-    _print = print_
-
-    def print_(*args, **kwargs):
-        fp = kwargs.get("file", sys.stdout)
-        flush = kwargs.pop("flush", False)
-        _print(*args, **kwargs)
-        if flush and fp is not None:
-            fp.flush()
-
-_add_doc(reraise, """Reraise an exception.""")
-
-if sys.version_info[0:2] < (3, 4):
-    # This does exactly the same what the :func:`py3:functools.update_wrapper`
-    # function does on Python versions after 3.2. It sets the ``__wrapped__``
-    # attribute on ``wrapper`` object and it doesn't raise an error if any of
-    # the attributes mentioned in ``assigned`` and ``updated`` are missing on
-    # ``wrapped`` object.
-    def _update_wrapper(wrapper, wrapped,
-                        assigned=functools.WRAPPER_ASSIGNMENTS,
-                        updated=functools.WRAPPER_UPDATES):
-        for attr in assigned:
-            try:
-                value = getattr(wrapped, attr)
-            except AttributeError:
-                continue
-            else:
-                setattr(wrapper, attr, value)
-        for attr in updated:
-            getattr(wrapper, attr).update(getattr(wrapped, attr, {}))
-        wrapper.__wrapped__ = wrapped
-        return wrapper
-    _update_wrapper.__doc__ = functools.update_wrapper.__doc__
-
-    def wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS,
-              updated=functools.WRAPPER_UPDATES):
-        return functools.partial(_update_wrapper, wrapped=wrapped,
-                                 assigned=assigned, updated=updated)
-    wraps.__doc__ = functools.wraps.__doc__
-
-else:
-    wraps = functools.wraps
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass."""
-    # This requires a bit of explanation: the basic idea is to make a dummy
-    # metaclass for one level of class instantiation that replaces itself with
-    # the actual metaclass.
-    class metaclass(type):
-
-        def __new__(cls, name, this_bases, d):
-            if sys.version_info[:2] >= (3, 7):
-                # This version introduced PEP 560 that requires a bit
-                # of extra care (we mimic what is done by __build_class__).
-                resolved_bases = types.resolve_bases(bases)
-                if resolved_bases is not bases:
-                    d['__orig_bases__'] = bases
-            else:
-                resolved_bases = bases
-            return meta(name, resolved_bases, d)
-
-        @classmethod
-        def __prepare__(cls, name, this_bases):
-            return meta.__prepare__(name, bases)
-    return type.__new__(metaclass, 'temporary_class', (), {})
-
-
-def add_metaclass(metaclass):
-    """Class decorator for creating a class with a metaclass."""
-    def wrapper(cls):
-        orig_vars = cls.__dict__.copy()
-        slots = orig_vars.get('__slots__')
-        if slots is not None:
-            if isinstance(slots, str):
-                slots = [slots]
-            for slots_var in slots:
-                orig_vars.pop(slots_var)
-        orig_vars.pop('__dict__', None)
-        orig_vars.pop('__weakref__', None)
-        if hasattr(cls, '__qualname__'):
-            orig_vars['__qualname__'] = cls.__qualname__
-        return metaclass(cls.__name__, cls.__bases__, orig_vars)
-    return wrapper
-
-
-def ensure_binary(s, encoding='utf-8', errors='strict'):
-    """Coerce **s** to six.binary_type.
-
-    For Python 2:
-      - `unicode` -> encoded to `str`
-      - `str` -> `str`
-
-    For Python 3:
-      - `str` -> encoded to `bytes`
-      - `bytes` -> `bytes`
-    """
-    if isinstance(s, binary_type):
-        return s
-    if isinstance(s, text_type):
-        return s.encode(encoding, errors)
-    raise TypeError("not expecting type '%s'" % type(s))
-
-
-def ensure_str(s, encoding='utf-8', errors='strict'):
-    """Coerce *s* to `str`.
-
-    For Python 2:
-      - `unicode` -> encoded to `str`
-      - `str` -> `str`
-
-    For Python 3:
-      - `str` -> `str`
-      - `bytes` -> decoded to `str`
-    """
-    # Optimization: Fast return for the common case.
-    if type(s) is str:
-        return s
-    if PY2 and isinstance(s, text_type):
-        return s.encode(encoding, errors)
-    elif PY3 and isinstance(s, binary_type):
-        return s.decode(encoding, errors)
-    elif not isinstance(s, (text_type, binary_type)):
-        raise TypeError("not expecting type '%s'" % type(s))
-    return s
-
-
-def ensure_text(s, encoding='utf-8', errors='strict'):
-    """Coerce *s* to six.text_type.
-
-    For Python 2:
-      - `unicode` -> `unicode`
-      - `str` -> `unicode`
-
-    For Python 3:
-      - `str` -> `str`
-      - `bytes` -> decoded to `str`
-    """
-    if isinstance(s, binary_type):
-        return s.decode(encoding, errors)
-    elif isinstance(s, text_type):
-        return s
-    else:
-        raise TypeError("not expecting type '%s'" % type(s))
-
-
-def python_2_unicode_compatible(klass):
-    """
-    A class decorator that defines __unicode__ and __str__ methods under Python 2.
-    Under Python 3 it does nothing.
-
-    To support Python 2 and 3 with a single code base, define a __str__ method
-    returning text and apply this decorator to the class.
-    """
-    if PY2:
-        if '__str__' not in klass.__dict__:
-            raise ValueError("@python_2_unicode_compatible cannot be applied "
-                             "to %s because it doesn't define __str__()." %
-                             klass.__name__)
-        klass.__unicode__ = klass.__str__
-        klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
-    return klass
-
-
-# Complete the moves implementation.
-# This code is at the end of this module to speed up module loading.
-# Turn this module into a package.
-__path__ = []  # required for PEP 302 and PEP 451
-__package__ = __name__  # see PEP 366 @ReservedAssignment
-if globals().get("__spec__") is not None:
-    __spec__.submodule_search_locations = []  # PEP 451 @UndefinedVariable
-# Remove other six meta path importers, since they cause problems. This can
-# happen if six is removed from sys.modules and then reloaded. (Setuptools does
-# this for some reason.)
-if sys.meta_path:
-    for i, importer in enumerate(sys.meta_path):
-        # Here's some real nastiness: Another "instance" of the six module might
-        # be floating around. Therefore, we can't use isinstance() to check for
-        # the six meta path importer, since the other six instance will have
-        # inserted an importer with different class.
-        if (type(importer).__name__ == "_SixMetaPathImporter" and
-                importer.name == __name__):
-            del sys.meta_path[i]
-            break
-    del i, importer
-# Finally, add the importer to the meta path import hook.
-sys.meta_path.append(_importer)
diff --git a/third_party/py/six/test_six.py b/third_party/py/six/test_six.py
deleted file mode 100644
index 7b8b03b..0000000
--- a/third_party/py/six/test_six.py
+++ /dev/null
@@ -1,1041 +0,0 @@
-# Copyright (c) 2010-2020 Benjamin Peterson
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
-
-import operator
-import sys
-import types
-import unittest
-import abc
-
-import pytest
-
-import six
-
-
-def test_add_doc():
-    def f():
-        """Icky doc"""
-        pass
-    six._add_doc(f, """New doc""")
-    assert f.__doc__ == "New doc"
-
-
-def test_import_module():
-    from logging import handlers
-    m = six._import_module("logging.handlers")
-    assert m is handlers
-
-
-def test_integer_types():
-    assert isinstance(1, six.integer_types)
-    assert isinstance(-1, six.integer_types)
-    assert isinstance(six.MAXSIZE + 23, six.integer_types)
-    assert not isinstance(.1, six.integer_types)
-
-
-def test_string_types():
-    assert isinstance("hi", six.string_types)
-    assert isinstance(six.u("hi"), six.string_types)
-    assert issubclass(six.text_type, six.string_types)
-
-
-def test_class_types():
-    class X:
-        pass
-    class Y(object):
-        pass
-    assert isinstance(X, six.class_types)
-    assert isinstance(Y, six.class_types)
-    assert not isinstance(X(), six.class_types)
-
-
-def test_text_type():
-    assert type(six.u("hi")) is six.text_type
-
-
-def test_binary_type():
-    assert type(six.b("hi")) is six.binary_type
-
-
-def test_MAXSIZE():
-    try:
-        # This shouldn't raise an overflow error.
-        six.MAXSIZE.__index__()
-    except AttributeError:
-        # Before Python 2.6.
-        pass
-    pytest.raises(
-        (ValueError, OverflowError),
-        operator.mul, [None], six.MAXSIZE + 1)
-
-
-def test_lazy():
-    if six.PY3:
-        html_name = "html.parser"
-    else:
-        html_name = "HTMLParser"
-    assert html_name not in sys.modules
-    mod = six.moves.html_parser
-    assert sys.modules[html_name] is mod
-    assert "htmlparser" not in six._MovedItems.__dict__
-
-
-try:
-    import _tkinter
-except ImportError:
-    have_tkinter = False
-else:
-    have_tkinter = True
-
-have_gdbm = True
-try:
-    import gdbm
-except ImportError:
-    try:
-        import dbm.gnu
-    except ImportError:
-        have_gdbm = False
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._moved_attributes])
-def test_move_items(item_name):
-    """Ensure that everything loads correctly."""
-    try:
-        item = getattr(six.moves, item_name)
-        if isinstance(item, types.ModuleType):
-            __import__("six.moves." + item_name)
-    except ImportError:
-        if item_name == "winreg" and not sys.platform.startswith("win"):
-            pytest.skip("Windows only module")
-        if item_name.startswith("tkinter"):
-            if not have_tkinter:
-                pytest.skip("requires tkinter")
-        if item_name.startswith("dbm_gnu") and not have_gdbm:
-            pytest.skip("requires gdbm")
-        raise
-    assert item_name in dir(six.moves)
-
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._urllib_parse_moved_attributes])
-def test_move_items_urllib_parse(item_name):
-    """Ensure that everything loads correctly."""
-    assert item_name in dir(six.moves.urllib.parse)
-    getattr(six.moves.urllib.parse, item_name)
-
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._urllib_error_moved_attributes])
-def test_move_items_urllib_error(item_name):
-    """Ensure that everything loads correctly."""
-    assert item_name in dir(six.moves.urllib.error)
-    getattr(six.moves.urllib.error, item_name)
-
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._urllib_request_moved_attributes])
-def test_move_items_urllib_request(item_name):
-    """Ensure that everything loads correctly."""
-    assert item_name in dir(six.moves.urllib.request)
-    getattr(six.moves.urllib.request, item_name)
-
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._urllib_response_moved_attributes])
-def test_move_items_urllib_response(item_name):
-    """Ensure that everything loads correctly."""
-    assert item_name in dir(six.moves.urllib.response)
-    getattr(six.moves.urllib.response, item_name)
-
-
-@pytest.mark.parametrize("item_name",
-                          [item.name for item in six._urllib_robotparser_moved_attributes])
-def test_move_items_urllib_robotparser(item_name):
-    """Ensure that everything loads correctly."""
-    assert item_name in dir(six.moves.urllib.robotparser)
-    getattr(six.moves.urllib.robotparser, item_name)
-
-
-def test_import_moves_error_1():
-    from six.moves.urllib.parse import urljoin
-    from six import moves
-    # In 1.4.1: AttributeError: 'Module_six_moves_urllib_parse' object has no attribute 'urljoin'
-    assert moves.urllib.parse.urljoin
-
-
-def test_import_moves_error_2():
-    from six import moves
-    assert moves.urllib.parse.urljoin
-    # In 1.4.1: ImportError: cannot import name urljoin
-    from six.moves.urllib.parse import urljoin
-
-
-def test_import_moves_error_3():
-    from six.moves.urllib.parse import urljoin
-    # In 1.4.1: ImportError: cannot import name urljoin
-    from six.moves.urllib_parse import urljoin
-
-
-def test_from_imports():
-    from six.moves.queue import Queue
-    assert isinstance(Queue, six.class_types)
-    from six.moves.configparser import ConfigParser
-    assert isinstance(ConfigParser, six.class_types)
-
-
-def test_filter():
-    from six.moves import filter
-    f = filter(lambda x: x % 2, range(10))
-    assert six.advance_iterator(f) == 1
-
-
-def test_filter_false():
-    from six.moves import filterfalse
-    f = filterfalse(lambda x: x % 3, range(10))
-    assert six.advance_iterator(f) == 0
-    assert six.advance_iterator(f) == 3
-    assert six.advance_iterator(f) == 6
-
-def test_map():
-    from six.moves import map
-    assert six.advance_iterator(map(lambda x: x + 1, range(2))) == 1
-
-
-def test_getoutput():
-    from six.moves import getoutput
-    output = getoutput('echo "foo"')
-    assert output == 'foo'
-
-
-def test_zip():
-    from six.moves import zip
-    assert six.advance_iterator(zip(range(2), range(2))) == (0, 0)
-
-
-def test_zip_longest():
-    from six.moves import zip_longest
-    it = zip_longest(range(2), range(1))
-
-    assert six.advance_iterator(it) == (0, 0)
-    assert six.advance_iterator(it) == (1, None)
-
-
-class TestCustomizedMoves:
-
-    def teardown_method(self, meth):
-        try:
-            del six._MovedItems.spam
-        except AttributeError:
-            pass
-        try:
-            del six.moves.__dict__["spam"]
-        except KeyError:
-            pass
-
-
-    def test_moved_attribute(self):
-        attr = six.MovedAttribute("spam", "foo", "bar")
-        if six.PY3:
-            assert attr.mod == "bar"
-        else:
-            assert attr.mod == "foo"
-        assert attr.attr == "spam"
-        attr = six.MovedAttribute("spam", "foo", "bar", "lemma")
-        assert attr.attr == "lemma"
-        attr = six.MovedAttribute("spam", "foo", "bar", "lemma", "theorm")
-        if six.PY3:
-            assert attr.attr == "theorm"
-        else:
-            assert attr.attr == "lemma"
-
-
-    def test_moved_module(self):
-        attr = six.MovedModule("spam", "foo")
-        if six.PY3:
-            assert attr.mod == "spam"
-        else:
-            assert attr.mod == "foo"
-        attr = six.MovedModule("spam", "foo", "bar")
-        if six.PY3:
-            assert attr.mod == "bar"
-        else:
-            assert attr.mod == "foo"
-
-
-    def test_custom_move_module(self):
-        attr = six.MovedModule("spam", "six", "six")
-        six.add_move(attr)
-        six.remove_move("spam")
-        assert not hasattr(six.moves, "spam")
-        attr = six.MovedModule("spam", "six", "six")
-        six.add_move(attr)
-        from six.moves import spam
-        assert spam is six
-        six.remove_move("spam")
-        assert not hasattr(six.moves, "spam")
-
-
-    def test_custom_move_attribute(self):
-        attr = six.MovedAttribute("spam", "six", "six", "u", "u")
-        six.add_move(attr)
-        six.remove_move("spam")
-        assert not hasattr(six.moves, "spam")
-        attr = six.MovedAttribute("spam", "six", "six", "u", "u")
-        six.add_move(attr)
-        from six.moves import spam
-        assert spam is six.u
-        six.remove_move("spam")
-        assert not hasattr(six.moves, "spam")
-
-
-    def test_empty_remove(self):
-        pytest.raises(AttributeError, six.remove_move, "eggs")
-
-
-def test_get_unbound_function():
-    class X(object):
-        def m(self):
-            pass
-    assert six.get_unbound_function(X.m) is X.__dict__["m"]
-
-
-def test_get_method_self():
-    class X(object):
-        def m(self):
-            pass
-    x = X()
-    assert six.get_method_self(x.m) is x
-    pytest.raises(AttributeError, six.get_method_self, 42)
-
-
-def test_get_method_function():
-    class X(object):
-        def m(self):
-            pass
-    x = X()
-    assert six.get_method_function(x.m) is X.__dict__["m"]
-    pytest.raises(AttributeError, six.get_method_function, hasattr)
-
-
-def test_get_function_closure():
-    def f():
-        x = 42
-        def g():
-            return x
-        return g
-    cell = six.get_function_closure(f())[0]
-    assert type(cell).__name__ == "cell"
-
-
-def test_get_function_code():
-    def f():
-        pass
-    assert isinstance(six.get_function_code(f), types.CodeType)
-    if not hasattr(sys, "pypy_version_info"):
-        pytest.raises(AttributeError, six.get_function_code, hasattr)
-
-
-def test_get_function_defaults():
-    def f(x, y=3, b=4):
-        pass
-    assert six.get_function_defaults(f) == (3, 4)
-
-
-def test_get_function_globals():
-    def f():
-        pass
-    assert six.get_function_globals(f) is globals()
-
-
-def test_dictionary_iterators(monkeypatch):
-    def stock_method_name(iterwhat):
-        """Given a method suffix like "lists" or "values", return the name
-        of the dict method that delivers those on the version of Python
-        we're running in."""
-        if six.PY3:
-            return iterwhat
-        return 'iter' + iterwhat
-
-    class MyDict(dict):
-        if not six.PY3:
-            def lists(self, **kw):
-                return [1, 2, 3]
-        def iterlists(self, **kw):
-            return iter([1, 2, 3])
-    f = MyDict.iterlists
-    del MyDict.iterlists
-    setattr(MyDict, stock_method_name('lists'), f)
-
-    d = MyDict(zip(range(10), reversed(range(10))))
-    for name in "keys", "values", "items", "lists":
-        meth = getattr(six, "iter" + name)
-        it = meth(d)
-        assert not isinstance(it, list)
-        assert list(it) == list(getattr(d, name)())
-        pytest.raises(StopIteration, six.advance_iterator, it)
-        record = []
-        def with_kw(*args, **kw):
-            record.append(kw["kw"])
-            return old(*args)
-        old = getattr(MyDict, stock_method_name(name))
-        monkeypatch.setattr(MyDict, stock_method_name(name), with_kw)
-        meth(d, kw=42)
-        assert record == [42]
-        monkeypatch.undo()
-
-
-def test_dictionary_views():
-    d = dict(zip(range(10), (range(11, 20))))
-    for name in "keys", "values", "items":
-        meth = getattr(six, "view" + name)
-        view = meth(d)
-        assert set(view) == set(getattr(d, name)())
-
-
-def test_advance_iterator():
-    assert six.next is six.advance_iterator
-    l = [1, 2]
-    it = iter(l)
-    assert six.next(it) == 1
-    assert six.next(it) == 2
-    pytest.raises(StopIteration, six.next, it)
-    pytest.raises(StopIteration, six.next, it)
-
-
-def test_iterator():
-    class myiter(six.Iterator):
-        def __next__(self):
-            return 13
-    assert six.advance_iterator(myiter()) == 13
-    class myitersub(myiter):
-        def __next__(self):
-            return 14
-    assert six.advance_iterator(myitersub()) == 14
-
-
-def test_callable():
-    class X:
-        def __call__(self):
-            pass
-        def method(self):
-            pass
-    assert six.callable(X)
-    assert six.callable(X())
-    assert six.callable(test_callable)
-    assert six.callable(hasattr)
-    assert six.callable(X.method)
-    assert six.callable(X().method)
-    assert not six.callable(4)
-    assert not six.callable("string")
-
-
-def test_create_bound_method():
-    class X(object):
-        pass
-    def f(self):
-        return self
-    x = X()
-    b = six.create_bound_method(f, x)
-    assert isinstance(b, types.MethodType)
-    assert b() is x
-
-
-def test_create_unbound_method():
-    class X(object):
-        pass
-
-    def f(self):
-        return self
-    u = six.create_unbound_method(f, X)
-    pytest.raises(TypeError, u)
-    if six.PY2:
-        assert isinstance(u, types.MethodType)
-    x = X()
-    assert f(x) is x
-
-
-if six.PY3:
-
-    def test_b():
-        data = six.b("\xff")
-        assert isinstance(data, bytes)
-        assert len(data) == 1
-        assert data == bytes([255])
-
-
-    def test_u():
-        s = six.u("hi \u0439 \U00000439 \\ \\\\ \n")
-        assert isinstance(s, str)
-        assert s == "hi \u0439 \U00000439 \\ \\\\ \n"
-
-else:
-
-    def test_b():
-        data = six.b("\xff")
-        assert isinstance(data, str)
-        assert len(data) == 1
-        assert data == "\xff"
-
-
-    def test_u():
-        s = six.u("hi \u0439 \U00000439 \\ \\\\ \n")
-        assert isinstance(s, unicode)
-        assert s == "hi \xd0\xb9 \xd0\xb9 \\ \\\\ \n".decode("utf8")
-
-
-def test_u_escapes():
-    s = six.u("\u1234")
-    assert len(s) == 1
-
-
-def test_unichr():
-    assert six.u("\u1234") == six.unichr(0x1234)
-    assert type(six.u("\u1234")) is type(six.unichr(0x1234))
-
-
-def test_int2byte():
-    assert six.int2byte(3) == six.b("\x03")
-    pytest.raises(Exception, six.int2byte, 256)
-
-
-def test_byte2int():
-    assert six.byte2int(six.b("\x03")) == 3
-    assert six.byte2int(six.b("\x03\x04")) == 3
-    pytest.raises(IndexError, six.byte2int, six.b(""))
-
-
-def test_bytesindex():
-    assert six.indexbytes(six.b("hello"), 3) == ord("l")
-
-
-def test_bytesiter():
-    it = six.iterbytes(six.b("hi"))
-    assert six.next(it) == ord("h")
-    assert six.next(it) == ord("i")
-    pytest.raises(StopIteration, six.next, it)
-
-
-def test_StringIO():
-    fp = six.StringIO()
-    fp.write(six.u("hello"))
-    assert fp.getvalue() == six.u("hello")
-
-
-def test_BytesIO():
-    fp = six.BytesIO()
-    fp.write(six.b("hello"))
-    assert fp.getvalue() == six.b("hello")
-
-
-def test_exec_():
-    def f():
-        l = []
-        six.exec_("l.append(1)")
-        assert l == [1]
-    f()
-    ns = {}
-    six.exec_("x = 42", ns)
-    assert ns["x"] == 42
-    glob = {}
-    loc = {}
-    six.exec_("global y; y = 42; x = 12", glob, loc)
-    assert glob["y"] == 42
-    assert "x" not in glob
-    assert loc["x"] == 12
-    assert "y" not in loc
-
-
-def test_reraise():
-    def get_next(tb):
-        if six.PY3:
-            return tb.tb_next.tb_next
-        else:
-            return tb.tb_next
-    e = Exception("blah")
-    try:
-        raise e
-    except Exception:
-        tp, val, tb = sys.exc_info()
-    try:
-        six.reraise(tp, val, tb)
-    except Exception:
-        tp2, value2, tb2 = sys.exc_info()
-        assert tp2 is Exception
-        assert value2 is e
-        assert tb is get_next(tb2)
-    try:
-        six.reraise(tp, val)
-    except Exception:
-        tp2, value2, tb2 = sys.exc_info()
-        assert tp2 is Exception
-        assert value2 is e
-        assert tb2 is not tb
-    try:
-        six.reraise(tp, val, tb2)
-    except Exception:
-        tp2, value2, tb3 = sys.exc_info()
-        assert tp2 is Exception
-        assert value2 is e
-        assert get_next(tb3) is tb2
-    try:
-        six.reraise(tp, None, tb)
-    except Exception:
-        tp2, value2, tb2 = sys.exc_info()
-        assert tp2 is Exception
-        assert value2 is not val
-        assert isinstance(value2, Exception)
-        assert tb is get_next(tb2)
-
-
-def test_raise_from():
-    try:
-        try:
-            raise Exception("blah")
-        except Exception:
-            ctx = sys.exc_info()[1]
-            f = Exception("foo")
-            six.raise_from(f, None)
-    except Exception:
-        tp, val, tb = sys.exc_info()
-    if sys.version_info[:2] > (3, 0):
-        # We should have done a raise f from None equivalent.
-        assert val.__cause__ is None
-        assert val.__context__ is ctx
-        # And that should suppress the context on the exception.
-        assert val.__suppress_context__
-    # For all versions the outer exception should have raised successfully.
-    assert str(val) == "foo"
-
-
-def test_print_():
-    save = sys.stdout
-    out = sys.stdout = six.moves.StringIO()
-    try:
-        six.print_("Hello,", "person!")
-    finally:
-        sys.stdout = save
-    assert out.getvalue() == "Hello, person!\n"
-    out = six.StringIO()
-    six.print_("Hello,", "person!", file=out)
-    assert out.getvalue() == "Hello, person!\n"
-    out = six.StringIO()
-    six.print_("Hello,", "person!", file=out, end="")
-    assert out.getvalue() == "Hello, person!"
-    out = six.StringIO()
-    six.print_("Hello,", "person!", file=out, sep="X")
-    assert out.getvalue() == "Hello,Xperson!\n"
-    out = six.StringIO()
-    six.print_(six.u("Hello,"), six.u("person!"), file=out)
-    result = out.getvalue()
-    assert isinstance(result, six.text_type)
-    assert result == six.u("Hello, person!\n")
-    six.print_("Hello", file=None) # This works.
-    out = six.StringIO()
-    six.print_(None, file=out)
-    assert out.getvalue() == "None\n"
-    class FlushableStringIO(six.StringIO):
-        def __init__(self):
-            six.StringIO.__init__(self)
-            self.flushed = False
-        def flush(self):
-            self.flushed = True
-    out = FlushableStringIO()
-    six.print_("Hello", file=out)
-    assert not out.flushed
-    six.print_("Hello", file=out, flush=True)
-    assert out.flushed
-
-
-def test_print_exceptions():
-    pytest.raises(TypeError, six.print_, x=3)
-    pytest.raises(TypeError, six.print_, end=3)
-    pytest.raises(TypeError, six.print_, sep=42)
-
-
-def test_with_metaclass():
-    class Meta(type):
-        pass
-    class X(six.with_metaclass(Meta)):
-        pass
-    assert type(X) is Meta
-    assert issubclass(X, object)
-    class Base(object):
-        pass
-    class X(six.with_metaclass(Meta, Base)):
-        pass
-    assert type(X) is Meta
-    assert issubclass(X, Base)
-    class Base2(object):
-        pass
-    class X(six.with_metaclass(Meta, Base, Base2)):
-        pass
-    assert type(X) is Meta
-    assert issubclass(X, Base)
-    assert issubclass(X, Base2)
-    assert X.__mro__ == (X, Base, Base2, object)
-    class X(six.with_metaclass(Meta)):
-        pass
-    class MetaSub(Meta):
-        pass
-    class Y(six.with_metaclass(MetaSub, X)):
-        pass
-    assert type(Y) is MetaSub
-    assert Y.__mro__ == (Y, X, object)
-
-
-def test_with_metaclass_typing():
-    try:
-        import typing
-    except ImportError:
-        pytest.skip("typing module required")
-    class Meta(type):
-        pass
-    if sys.version_info[:2] < (3, 7):
-        # Generics with custom metaclasses were broken on older versions.
-        class Meta(Meta, typing.GenericMeta):
-            pass
-    T = typing.TypeVar('T')
-    class G(six.with_metaclass(Meta, typing.Generic[T])):
-        pass
-    class GA(six.with_metaclass(abc.ABCMeta, typing.Generic[T])):
-        pass
-    assert isinstance(G, Meta)
-    assert isinstance(GA, abc.ABCMeta)
-    assert G[int] is not G[G[int]]
-    assert GA[int] is not GA[GA[int]]
-    assert G.__bases__ == (typing.Generic,)
-    assert G.__orig_bases__ == (typing.Generic[T],)
-
-
-@pytest.mark.skipif("sys.version_info[:2] < (3, 7)")
-def test_with_metaclass_pep_560():
-    class Meta(type):
-        pass
-    class A:
-        pass
-    class B:
-        pass
-    class Fake:
-        def __mro_entries__(self, bases):
-            return (A, B)
-    fake = Fake()
-    class G(six.with_metaclass(Meta, fake)):
-        pass
-    class GA(six.with_metaclass(abc.ABCMeta, fake)):
-        pass
-    assert isinstance(G, Meta)
-    assert isinstance(GA, abc.ABCMeta)
-    assert G.__bases__ == (A, B)
-    assert G.__orig_bases__ == (fake,)
-
-
-@pytest.mark.skipif("sys.version_info[:2] < (3, 0)")
-def test_with_metaclass_prepare():
-    """Test that with_metaclass causes Meta.__prepare__ to be called with the correct arguments."""
-
-    class MyDict(dict):
-        pass
-
-    class Meta(type):
-
-        @classmethod
-        def __prepare__(cls, name, bases):
-            namespace = MyDict(super().__prepare__(name, bases), cls=cls, bases=bases)
-            namespace['namespace'] = namespace
-            return namespace
-
-    class Base(object):
-        pass
-
-    bases = (Base,)
-
-    class X(six.with_metaclass(Meta, *bases)):
-        pass
-
-    assert getattr(X, 'cls', type) is Meta
-    assert getattr(X, 'bases', ()) == bases
-    assert isinstance(getattr(X, 'namespace', {}), MyDict)
-
-
-def test_wraps():
-    def f(g):
-        @six.wraps(g)
-        def w():
-            return 42
-        return w
-    def k():
-        pass
-    original_k = k
-    k = f(f(k))
-    assert hasattr(k, '__wrapped__')
-    k = k.__wrapped__
-    assert hasattr(k, '__wrapped__')
-    k = k.__wrapped__
-    assert k is original_k
-    assert not hasattr(k, '__wrapped__')
-
-    def f(g, assign, update):
-        def w():
-            return 42
-        w.glue = {"foo": "bar"}
-        w.xyzzy = {"qux": "quux"}
-        return six.wraps(g, assign, update)(w)
-    k.glue = {"melon": "egg"}
-    k.turnip = 43
-    k = f(k, ["turnip", "baz"], ["glue", "xyzzy"])
-    assert k.__name__ == "w"
-    assert k.turnip == 43
-    assert not hasattr(k, "baz")
-    assert k.glue == {"melon": "egg", "foo": "bar"}
-    assert k.xyzzy == {"qux": "quux"}
-
-
-def test_wraps_raises_on_missing_updated_field_on_wrapper():
-    """Ensure six.wraps doesn't ignore missing attrs wrapper.
-
-    Because that's what happens in Py3's functools.update_wrapper.
-    """
-    def wrapped():
-        pass
-
-    def wrapper():
-        pass
-
-    with pytest.raises(AttributeError, match='has no attribute.*xyzzy'):
-        six.wraps(wrapped, [], ['xyzzy'])(wrapper)
-
-
-
-def test_add_metaclass():
-    class Meta(type):
-        pass
-    class X:
-        "success"
-    X = six.add_metaclass(Meta)(X)
-    assert type(X) is Meta
-    assert issubclass(X, object)
-    assert X.__module__ == __name__
-    assert X.__doc__ == "success"
-    class Base(object):
-        pass
-    class X(Base):
-        pass
-    X = six.add_metaclass(Meta)(X)
-    assert type(X) is Meta
-    assert issubclass(X, Base)
-    class Base2(object):
-        pass
-    class X(Base, Base2):
-        pass
-    X = six.add_metaclass(Meta)(X)
-    assert type(X) is Meta
-    assert issubclass(X, Base)
-    assert issubclass(X, Base2)
-
-    # Test a second-generation subclass of a type.
-    class Meta1(type):
-        m1 = "m1"
-    class Meta2(Meta1):
-        m2 = "m2"
-    class Base:
-        b = "b"
-    Base = six.add_metaclass(Meta1)(Base)
-    class X(Base):
-        x = "x"
-    X = six.add_metaclass(Meta2)(X)
-    assert type(X) is Meta2
-    assert issubclass(X, Base)
-    assert type(Base) is Meta1
-    assert "__dict__" not in vars(X)
-    instance = X()
-    instance.attr = "test"
-    assert vars(instance) == {"attr": "test"}
-    assert instance.b == Base.b
-    assert instance.x == X.x
-
-    # Test a class with slots.
-    class MySlots(object):
-        __slots__ = ["a", "b"]
-    MySlots = six.add_metaclass(Meta1)(MySlots)
-
-    assert MySlots.__slots__ == ["a", "b"]
-    instance = MySlots()
-    instance.a = "foo"
-    pytest.raises(AttributeError, setattr, instance, "c", "baz")
-
-    # Test a class with string for slots.
-    class MyStringSlots(object):
-        __slots__ = "ab"
-    MyStringSlots = six.add_metaclass(Meta1)(MyStringSlots)
-    assert MyStringSlots.__slots__ == "ab"
-    instance = MyStringSlots()
-    instance.ab = "foo"
-    pytest.raises(AttributeError, setattr, instance, "a", "baz")
-    pytest.raises(AttributeError, setattr, instance, "b", "baz")
-
-    class MySlotsWeakref(object):
-        __slots__ = "__weakref__",
-    MySlotsWeakref = six.add_metaclass(Meta)(MySlotsWeakref)
-    assert type(MySlotsWeakref) is Meta
-
-
-@pytest.mark.skipif("sys.version_info[:2] < (3, 3)")
-def test_add_metaclass_nested():
-    # Regression test for https://github.com/benjaminp/six/issues/259
-    class Meta(type):
-        pass
-
-    class A:
-        class B: pass
-
-    expected = 'test_add_metaclass_nested.<locals>.A.B'
-
-    assert A.B.__qualname__ == expected
-
-    class A:
-        @six.add_metaclass(Meta)
-        class B: pass
-
-    assert A.B.__qualname__ == expected
-
-
-def test_assertCountEqual():
-    class TestAssertCountEqual(unittest.TestCase):
-        def test(self):
-            with self.assertRaises(AssertionError):
-                six.assertCountEqual(self, (1, 2), [3, 4, 5])
-
-            six.assertCountEqual(self, (1, 2), [2, 1])
-
-    TestAssertCountEqual('test').test()
-
-
-def test_assertRegex():
-    class TestAssertRegex(unittest.TestCase):
-        def test(self):
-            with self.assertRaises(AssertionError):
-                six.assertRegex(self, 'test', r'^a')
-
-            six.assertRegex(self, 'test', r'^t')
-
-    TestAssertRegex('test').test()
-
-
-def test_assertNotRegex():
-    class TestAssertNotRegex(unittest.TestCase):
-        def test(self):
-            with self.assertRaises(AssertionError):
-                six.assertNotRegex(self, 'test', r'^t')
-
-            six.assertNotRegex(self, 'test', r'^a')
-
-    TestAssertNotRegex('test').test()
-
-
-def test_assertRaisesRegex():
-    class TestAssertRaisesRegex(unittest.TestCase):
-        def test(self):
-            with six.assertRaisesRegex(self, AssertionError, '^Foo'):
-                raise AssertionError('Foo')
-
-            with self.assertRaises(AssertionError):
-                with six.assertRaisesRegex(self, AssertionError, r'^Foo'):
-                    raise AssertionError('Bar')
-
-    TestAssertRaisesRegex('test').test()
-
-
-def test_python_2_unicode_compatible():
-    @six.python_2_unicode_compatible
-    class MyTest(object):
-        def __str__(self):
-            return six.u('hello')
-
-        def __bytes__(self):
-            return six.b('hello')
-
-    my_test = MyTest()
-
-    if six.PY2:
-        assert str(my_test) == six.b("hello")
-        assert unicode(my_test) == six.u("hello")
-    elif six.PY3:
-        assert bytes(my_test) == six.b("hello")
-        assert str(my_test) == six.u("hello")
-
-    assert getattr(six.moves.builtins, 'bytes', str)(my_test) == six.b("hello")
-
-
-class EnsureTests:
-
-    # grinning face emoji
-    UNICODE_EMOJI = six.u("\U0001F600")
-    BINARY_EMOJI = b"\xf0\x9f\x98\x80"
-
-    def test_ensure_binary_raise_type_error(self):
-        with pytest.raises(TypeError):
-            six.ensure_str(8)
-
-    def test_errors_and_encoding(self):
-        six.ensure_binary(self.UNICODE_EMOJI, encoding='latin-1', errors='ignore')
-        with pytest.raises(UnicodeEncodeError):
-            six.ensure_binary(self.UNICODE_EMOJI, encoding='latin-1', errors='strict')
-
-    def test_ensure_binary_raise(self):
-        converted_unicode = six.ensure_binary(self.UNICODE_EMOJI, encoding='utf-8', errors='strict')
-        converted_binary = six.ensure_binary(self.BINARY_EMOJI, encoding="utf-8", errors='strict')
-        if six.PY2:
-            # PY2: unicode -> str
-            assert converted_unicode == self.BINARY_EMOJI and isinstance(converted_unicode, str)
-            # PY2: str -> str
-            assert converted_binary == self.BINARY_EMOJI and isinstance(converted_binary, str)
-        else:
-            # PY3: str -> bytes
-            assert converted_unicode == self.BINARY_EMOJI and isinstance(converted_unicode, bytes)
-            # PY3: bytes -> bytes
-            assert converted_binary == self.BINARY_EMOJI and isinstance(converted_binary, bytes)
-
-    def test_ensure_str(self):
-        converted_unicode = six.ensure_str(self.UNICODE_EMOJI, encoding='utf-8', errors='strict')
-        converted_binary = six.ensure_str(self.BINARY_EMOJI, encoding="utf-8", errors='strict')
-        if six.PY2:
-            # PY2: unicode -> str
-            assert converted_unicode == self.BINARY_EMOJI and isinstance(converted_unicode, str)
-            # PY2: str -> str
-            assert converted_binary == self.BINARY_EMOJI and isinstance(converted_binary, str)
-        else:
-            # PY3: str -> str
-            assert converted_unicode == self.UNICODE_EMOJI and isinstance(converted_unicode, str)
-            # PY3: bytes -> str
-            assert converted_binary == self.UNICODE_EMOJI and isinstance(converted_unicode, str)
-
-    def test_ensure_text(self):
-        converted_unicode = six.ensure_text(self.UNICODE_EMOJI, encoding='utf-8', errors='strict')
-        converted_binary = six.ensure_text(self.BINARY_EMOJI, encoding="utf-8", errors='strict')
-        if six.PY2:
-            # PY2: unicode -> unicode
-            assert converted_unicode == self.UNICODE_EMOJI and isinstance(converted_unicode, unicode)
-            # PY2: str -> unicode
-            assert converted_binary == self.UNICODE_EMOJI and isinstance(converted_unicode, unicode)
-        else:
-            # PY3: str -> str
-            assert converted_unicode == self.UNICODE_EMOJI and isinstance(converted_unicode, str)
-            # PY3: bytes -> str
-            assert converted_binary == self.UNICODE_EMOJI and isinstance(converted_unicode, str)
diff --git a/third_party/py/six/tox.ini b/third_party/py/six/tox.ini
deleted file mode 100644
index a1e3467..0000000
--- a/third_party/py/six/tox.ini
+++ /dev/null
@@ -1,11 +0,0 @@
-[tox]
-envlist=py27,py33,py34,py35,py36,py37,py38,pypy,flake8
-
-[testenv]
-deps= pytest
-commands= python -m pytest -rfsxX {posargs}
-
-[testenv:flake8]
-basepython=python
-deps=flake8
-commands= flake8 six.py