[issue18643] add a fallback socketpair() implementation in test.support

[Charles-François Natali]

Charles-François Natali added the comment:

> By the way, we should reuse socket.socketpair() in
> asyncio.windows_utils. The Tulip is written for Python 3.3 and shares
> exactly the same code base, so you should write
>
> Something like:
>
> if hasattr(socket, 'socketpair'):
>     socketpair = socket.socketpair
> else:
>   def socketpair(...): ...
>
> Please also fix socketpair() in asyncio to add the while/drop unknown
> connection (well, the function in socket.py and windows_utils.py must
> be the same).

That's a separate issue.

> Oh, and you forgot to modify the documentation to update
> "Availability". Please add a ".. versionchanged:: 3.5" mentionning
> that the function is now also available on Windows.

Did you look at the patch?

363 .. versionchanged:: 3.5
364 Windows support added

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