[issue18787] Misleading error from getspnam function of spwd module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PyErr_SetFromErrno(PyExc_OSError) looks more appropriate for permission denied error. However this change is backward incompatible so perhaps we have to left a KeyError.

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nosy: +loewis, serhiy.storchaka
stage:  -> test needed

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<http://bugs.python.org/issue18787>
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