[issue4261] The pwd module doesn't distinguish between errors and no user

[STINNER Victor]

STINNER Victor added the comment:

The current code doesn't check errno, but if the result is NULL. NULL is
returned if the user doesn't exist, or if an error occurred. But it looks
like errno is not always 0 when the user doesn't exist.

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<http://bugs.python.org/issue4261>
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