[issue19624] Switch constants in the errno module to IntEnum

[STINNER Victor]

STINNER Victor added the comment:

> This is not so easy issue because the errno module is not pure Python module. ;)

An option is to rename the C errno module to _errno and leave it unchanged, and provide a Python errno module which enum API.

Then slowly errno module should be used instead of _errno.

Using enum for errno should not slow down Python startup time.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19624>
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