[issue21396] Python io implementation doesn't flush with write_through=True unlike C implementation

[Antoine Pitrou]

Antoine Pitrou added the comment:

Actually, with the patch, the universal_newlines tests in test_subprocess hang (quite logically, since they lack a flush()). I will fix them as well.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21396>
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