[Python] setuptools python_requires

[Manlio Perillo]

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Hi.

In many of my projects I add a check for the Python version being used,
like:

if sys.version_info < (2, 6):
    raise SystemExit('xxx requires Python 2.6 or higher.')


I think it would be better to specify this requirement as a
`python_requires` parameter for the setup function.

What is the reason why this is not supported?


Thanks  Manlio
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