[issue21425] Interactive interpreter doesn't flush stderr prompty

[eryksun]

eryksun added the comment:

The patch fixes `python 2>&1 | cat.exe` for me on Windows, where cat.exe is from GnuWin32. The tests also pass. It looks like failing would entail hanging until a timeout.

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nosy: +eryksun

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21425>
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