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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 39f2a78f4357 by Antoine Pitrou in branch '3.4':
Issue #21396: Fix TextIOWrapper(..., write_through=True) to not force a flush() on the underlying binary stream.
http://hg.python.org/cpython/rev/39f2a78f4357

New changeset 37d0c41ed8ad by Antoine Pitrou in branch 'default':
Issue #21396: Fix TextIOWrapper(..., write_through=True) to not force a flush() on the underlying binary stream.
http://hg.python.org/cpython/rev/37d0c41ed8ad

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nosy: +python-dev

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