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

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. -- ___ Python tracker

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

Changes by Michał Bultrowicz : -- status: open -> closed ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https:

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

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. -- ___ Python tracker

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

Michał Bultrowicz added the comment: Then where it should be patched in? Can you give an example? From what I've checked patching only works in __main__ and builtins. -- ___ Python tracker

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

Michael Foord added the comment: open shouldn't always be patched in builtins, it's much better to patch it in the specific namespace it's being called from. So the doc patch here shouldn't be applied as is. -- ___ Python tracker

[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:

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

New submission from Michał Bultrowicz: Documentation of mock_open doesn't say how to use it in real-life test situations (when you're probably not mocking in __main__). I've spent some time scratching my head and googling for the way to mock-out the "open" function, want to spare other people