Bugs item #788035, was opened at 2003-08-13 09:17
Message generated for change (Comment added) made by akuchling
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Category: Python Library
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Torsten Marek (shlomme)
Assigned to: Nobody/Anonymous (nobody)
Summary: missing universal newline support in os.popen & friends
Initial Comment:
In contrast to the documentation, os.popen and relatives do not
support the "U" format character in their constructors.
os.popen("some_nifty_command some_arg", "rU")
throws
OSError: [Errno 22] Invalid argument ,
while os.popen{2,3,4} just ignores "U".
I noticed that behaviour while p-opening oggenc (the ogg vorbis
encoder), which uses curses for output. The lines end with \r and not
with \n (due to some ncurses internals, I suspect), so that the file
objects readline() function cannot split the output.
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>Comment By: A.M. Kuchling (akuchling)
Date: 2006-08-03 16:50
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popen5 was added to Python 2.4 as the subprocess module.
It's probably unlikely that someone will go back and fix the
low-level os.popen2() function. I suggest that this bug be
closed, and we encourage people to use the subprocess module.
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Comment By: Philip Lindsay (philiplindsay)
Date: 2004-01-13 05:46
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See http://advogato.org/person/follower/diary.html?start=43
for details of a possible interim work around. (WFM, YMMV)
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Comment By: Philip Lindsay (philiplindsay)
Date: 2004-01-13 05:45
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See
<http://advogato.org/person/follower/diary.html?start=43>
for details of a possible interim work around. (WFM, YMMV)
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Comment By: Peter Åstrand (astrand)
Date: 2003-11-03 15:01
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I've added universal newline support to popen5.
http://www.lysator.liu.se/~astrand/popen5/.
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Comment By: Jack Jansen (jackjansen)
Date: 2003-08-26 18:04
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Theoretically this is easy to fix: if mode=="U" or "rU"
just pass "r"
to popen(), "rb" to fdopen() and _O_BINARY to the lowlevel calls,
and the original string to PyFile_FromFile.
But this whole popen{,2,3,4} section of posixmodule.c is so
fiendishly complicated with all the platform special cases that I'm
loath to touch it...
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