[issue24809] Add getprotobynumber to socket module

[Yury Selivanov]

Yury Selivanov added the comment:

What are the use cases?

If it's "(Rarely used.)" (as docstring indicates), then, perhaps, a package on PyPI is a better solution.

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nosy: +haypo, yselivanov
versions: +Python 3.6 -Python 3.5

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<http://bugs.python.org/issue24809>
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