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

[Michał Bultrowicz]

Michał Bultrowicz added the comment:

One more update - I had the problem, because I was using monkeypatch.setattr() from Pytest, and assumed that it will work the same as patch(). This assumption turned out to be wrong.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28733>
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