Antoine Pitrou added the comment:
Ha, it seems actually worse than that, since no buffering argument is ever
passed to the TextIOWrapper constructor. "bufsize=1" will simply get ignored,
and line buffering doesn't work at all.
Example under 2.7:
$ python -c 'import subprocess; p = subprocess.Popen(["/bin/cat"],
stdin=subprocess.PIPE, stdout=subprocess.PIPE, bufsize=1,
universal_newlines=True); p.stdin.write("foo\n"); print(p.stdout.readline());
p.stdin.close()'
foo
Under 3.4, the same line hangs in the p.stdout.readline() call.
----------
title: subprocess line-buffering only works in universal newlines mode ->
subprocess line-buffering doesn't work
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21471>
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