I think some functions of `class TestCase` are not documented correctly in the docs. For example in https://docs.python.org/3.5/library/unittest.html and also https://docs.python.org/3.6/library/unittest.html and https://docs.python.org/3.7/library/unittest.html.

Some of the functions which are not documented correctly:

assertListEqual
assertSetEqual
assertDictEqual
assertIsNone

And many other functions.

You can see some more details on https://github.com/python/typeshed/issues/2716.

1. I think the main problem is where it's documented "first, second" while the real argument names are different.

2. I think maybe https://docs.python.org/2.7/library/unittest.html is also affected in functions such as:

assertGreater(first, second, msg=None)
assertGreaterEqual(first, second, msg=None)
assertLess(first, second, msg=None)
assertLessEqual(first, second, msg=None)

Thanks for the report. Looking at git history it seems there were some changes done in issue10573 to use (actual, expected) for consistency and later changed to use (first, second) in the same issue at msg126911. Discussion for the issue : https://mail.python.org/pipermail/python-dev/2010-December/106875.html

I think this is a bug as seen from typeshed https://github.com/python/typeshed/pull/2724/. But I will defer it to the maintainer to take a call on the same given there was a discussion in the past.

Removing versions that are on security fix only mode. I am changing the subject. Feel free to reword/revert.