| # 2-step function call |
| |
| x = [1, 2, 3] |
| y = x.clear |
| assert_eq(x, [1, 2, 3]) |
| z = y() |
| assert_eq(z, None) |
| assert_eq(x, []) |
| --- |
| |
| x = {1: 2} |
| y = x.pop |
| assert_eq(x, {1: 2}) |
| z = y(1) |
| assert_eq(z, 2) |
| assert_eq(x, {}) |
| --- |
| |
| x = "hello" |
| y = x.upper |
| z = y() |
| assert_eq(z, "HELLO") |
| assert_eq(x, "hello") |
| --- |
| |
| x = "abc" |
| y = x.index |
| z = y("b") |
| assert_eq(z, 1) |
| assert_eq(x, "abc") |
| --- |
| |
| y = {} |
| assert_eq(y.clear == y.clear, False) |
| assert_eq([].clear == [].clear, False) |
| assert_eq(type([].clear), "function") |
| assert_eq(str([].clear), "<built-in function clear>") |
| |
| --- |
| x = {}.pop |
| x() ### missing 1 required positional argument: key |
| --- |
| |
| # getattr |
| |
| assert_eq(getattr("abc", "upper")(), "ABC") |
| assert_eq(getattr({'a': True}, "pop")('a'), True) |
| assert_eq(getattr({}, "hello", "default"), "default") |
| |
| y = [1, 2, 3] |
| x = getattr(y, "clear") |
| assert_eq(y, [1, 2, 3]) |
| x() |
| assert_eq(y, []) |
| |
| --- |
| getattr("", "abc") ### 'string' value has no field or method 'abc' |
| --- |
| x = getattr("", "pop", "clear") |
| x() ### 'string' object is not callable |
