[issue25061] Add native enum support for argparse

[desbma]

desbma added the comment:

I guess the question is whether Enum should be considered a first class 'native' type that deserves support in argparse, or just a tool among others in the stdlib.

The fact that Enum is implemented as a class, and lives in a module, tends to lead to the second, but the fact that some constants were converted to enums in the stdlib (like in socket) tends to the first.

As a C/C++ developer, I may have a bias towards enums :)

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<http://bugs.python.org/issue25061>
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