[issue10388] spwd returning different value depending on privileges

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

I can agree with you that it's probably better to avoid changing existent python versions to avoid breakage but I see no need to be that strict for newer ones.

Current version should check errno but it doesn't. IMO that is clearly a bug.
Same goes for returning an empty list when users actually exists and for *not* raising FileNotFoundError if the shadow file is not available.

Also note that the doc does not mention that an empty list should be treated as an alias for "insufficient permissions" or "shadow file not available", therefore whoever made that assumption is someone who deliberately and erroneously decided to do so.

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<http://bugs.python.org/issue10388>
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