Chris Withers <ch...@withers.org> added the comment:

I'm not sure I like the API feel after this change: two parameters that can't 
be used at the same time.

As Karthikeyan points out, this can be achieved using side_effect. Personally, 
I'd prefer a PR that adds a unit test showing that this approach works, and an 
example included in the docs as suggested above.

Also, be aware that there can be better options for mocking files. 
https://github.com/jmcgeheeiv/pyfakefs/ and 
https://docs.pytest.org/en/latest/tmpdir.html would be my recommendation.

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<https://bugs.python.org/issue37669>
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