[New-bugs-announce] [issue21332] subprocess bufsize=1 docs are misleading

raylu report at bugs.python.org
Wed Apr 23 01:35:45 CEST 2014


New submission from raylu:

https://docs.python.org/3.3/library/subprocess.html says

"bufsize will be supplied as the corresponding argument to the open() function when creating the stdin/stdout/stderr pipe file objects: ... 1 means line buffered"

but it calls io.open with 'wb' and 'rb': http://hg.python.org/cpython/file/c9cb931b20f4/Lib/subprocess.py#l828

This puts the file in binary mode, and https://docs.python.org/3.3/library/functions.html#open says

"1 to select line buffering (only usable in text mode)"

Even with universal_newlines=True, the TextIOWrapper isn't passed line_buffering=True. There's actually no way to get line buffering any more.

----------
components: Library (Lib)
messages: 217044
nosy: raylu
priority: normal
severity: normal
status: open
title: subprocess bufsize=1 docs are misleading
versions: Python 3.3, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21332>
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