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

[Michał Bultrowicz]

Michał Bultrowicz added the comment:

Ok, I've checked again and now patching "file_writer.open" works. I have no idea what I was doing wrong the last time I checked... So I guess I'll close the issue.

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