Update documentation for srcs_version in python rules
* highlight this attribute is deprecated from 0.5.3 because of `py_runtime` rule.
PiperOrigin-RevId: 165945840
diff --git a/src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPyRuleClasses.java b/src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPyRuleClasses.java
index 295f018..85743d3 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPyRuleClasses.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/rules/python/BazelPyRuleClasses.java
@@ -89,8 +89,13 @@
<!-- #END_BLAZE_RULE.ATTRIBUTE --> */
.add(attr("imports", STRING_LIST).value(ImmutableList.<String>of()))
/* <!-- #BLAZE_RULE($base_py).ATTRIBUTE(srcs_version) -->
+ The value set here is for documentation purpose, and it will NOT determine which version
+ of python interpreter to use. Starting with 0.5.3 this attribute has been deprecated and
+ no longer has effect.
A string specifying the Python major version(s) that the <code>.py</code> source
files listed in the <code>srcs</code> of this rule are compatible with.
+ Please reference to <a href="${link py_runtime}"><code>py_runtime</code></a> rules for
+ determining the python version.
Valid values are:<br/>
<code>"PY2ONLY"</code> -
Python 2 code that is <b>not</b> suitable for <code>2to3</code> conversion.<br/>
