[docs] [issue28733] Show how to use mock_open in modules other that __main__

Berker Peksag added the comment: Thanks for the report and for the patch. I think expanding the "Where to patch" [1] section would be better. We can then refer to it from the mock_open() documentation. [1] https://docs.python.org/3.6/library/unittest.mock.html#where-to-patch ---------- nosy: +berker.peksag, michael.foord stage: -> patch review versions: -Python 3.3, Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue28733> _______________________________________