New submission from akira:
related: msg217596 (bufsize=1 is broken if subprocess module uses Python io)
TextIOWrapper.write behavior:
_pyio.py [1]:
if self._line_buffering and (haslf or "\r" in s):
self.flush()
textio.c [2]:
if (self->write_through)
needflush = 1;
else if (self->line_buffering &&
(haslf ||
PyUnicode_FindChar(text, '\r', 0, PyUnicode_GET_LENGTH(text), 1) !=
-1))
needflush = 1;
C implementation calls flush() if write_through=True, Python implementation
doesn't.
[1]: http://hg.python.org/cpython/file/0b2e199ad088/Lib/_pyio.py#l1636
[2]: http://hg.python.org/cpython/file/0b2e199ad088/Modules/_io/textio.c#l1333
----------
components: IO
messages: 217600
nosy: akira
priority: normal
severity: normal
status: open
title: Python io implementation doesn't flush with write_through=True unlike C
implementation
type: behavior
versions: Python 3.3, Python 3.4, Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21396>
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