[issue32033] The pwd module implementation incorrectly sets some attributes to None

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I disagree. This is an old API, a thin wrapper around standard POSIX API, and returning an empty string instead of None will make impossible to distinguish NULL from "".

It is easy to convert None in an empty string in Python: `value or ''`.

I would change the test to

    if field is not None:
        self.assertIsInstance(field, str)

or

    self.assertIsInstance(field, (str, type(None)))

(I prefer the former variant).

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<https://bugs.python.org/issue32033>
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