[issue1191964] add non-blocking read and write methods to subprocess.Popen

[STINNER Victor]

STINNER Victor added the comment:

> I have implemented and would continue to lean towards continuing to hide BrokenPipeError on the additional API endpoints.

FYI asyncio.Process.communicate() ignores BrokenPipeError and ConnectionResetError, whereas asyncio.Process.stdin.drain() (coroutine to wait until all bytes are written) raises a BrokenPipeError or ConnectionResetError if the child process exited. I think subprocess has the same design.

(I modified recently asyncio to ignore BrokenPipeError in communicate(), it was a bug.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1191964>
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