[issue9939] Add a pipe type (FIFO) to the io module

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Another option would be to have the read-end act like a non-blocking
> socket (i.e., raise EAGAIN).
> 
> Since it would mostly be for testing, would it make more sense to add
> it to test.support or someplace similar instead of io?

I thought it might be useful for third-party libraries, or even
non-testing situations (although obviously the latter wouldn't be very
common). But, yes, a starting point could be test.support. It would also
avoid having to write unit tests and docs :)
In this case, I would like to do it as a part of the nntplib patch.

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<http://bugs.python.org/issue9939>
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