[issue22854] Documentation/implementation out of sync for IO

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have doubts about changing OSError to UnsupportedOperation in the documentation of readable() and writable(). Some implementations can try to do an IO operation without checking readable() and writable() flags.

I have lesser doubt about using half-closed pipes in tests. May be it is safe, I don't know.

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<http://bugs.python.org/issue22854>
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