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

[Berker Peksag]

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

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nosy: +berker.peksag, michael.foord
stage:  -> patch review
versions:  -Python 3.3, Python 3.4

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