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Fri Mar 28 23:09:11 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-March/133692.html

On 28/03/2014 06:35 pm, Josiah Carlson wrote:
>
>     If it were me, I'd define three methods, with longer names to
>     clarify what they do, e.g.
>
>     proc.write_nonblocking(data)
>     data = proc.read_nonblocking()
>     data = proc.read_stderr_nonblocking()
>
>
> Easily doable.
To implement write_nonblocking() on Windows, do you intend to use 
SetNamedPipeHandleState() with PIPE_NOWAIT?  The documentation 
discourages using this:

    Note that nonblocking mode is supported for compatibility with
    Microsoft LAN Manager version 2.0 and should not be used to
    achieve asynchronous input and output (I/O) with named pipes.

And I guess you will need to use a poll/sleep loop to simulate blocking 
or multiplexing.  If you want expect-like behaviour then you need some 
sort of multiplexing.

-- RIchard**
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[Python-Dev] Status of PEP 3145