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Document that on Unix, the 'cmd' argument to the os.popen2/3/4 and

Browse source 
popen2.popen2/3/4 functions can be a sequence. All texts are a variation on the
following:

On \UNIX, \var{cmd} may be a sequence, in which case arguments will be passed
directly to the program without shell intervention (as with
\function{os.spawnv()}). If \var{cmd} is a string it will be passed to the shell
(as with \function{os.system()}).
This commit is contained in:
Johannes Gijsbers 2004-10-11 18:12:20 +00:00
parent c054a8b1a9
commit 9fc9789a0d
4 changed files with 75 additions and 27 deletions
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18
Lib/os.py
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@ -611,6 +611,12 @@ otherwise return -SIG, where SIG is the signal that killed it. """
if _exists("fork"):
if not _exists("popen2"):
def popen2(cmd, mode="t", bufsize=-1):
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd'
may be a sequence, in which case arguments will be passed directly to
the program without shell intervention (as with os.spawnv()). If 'cmd'
is a string it will be passed to the shell (as with os.system()). If
'bufsize' is specified, it sets the buffer size for the I/O pipes. The
file objects (child_stdin, child_stdout) are returned."""
import popen2
stdout, stdin = popen2.popen2(cmd, bufsize)
return stdin, stdout
@ -618,6 +624,12 @@ if _exists("fork"):
if not _exists("popen3"):
def popen3(cmd, mode="t", bufsize=-1):
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd'
may be a sequence, in which case arguments will be passed directly to
the program without shell intervention (as with os.spawnv()). If 'cmd'
is a string it will be passed to the shell (as with os.system()). If
'bufsize' is specified, it sets the buffer size for the I/O pipes. The
file objects (child_stdin, child_stdout, child_stderr) are returned."""
import popen2
stdout, stdin, stderr = popen2.popen3(cmd, bufsize)
return stdin, stdout, stderr
@ -625,6 +637,12 @@ if _exists("fork"):
if not _exists("popen4"):
def popen4(cmd, mode="t", bufsize=-1):
"""Execute the shell command 'cmd' in a sub-process. On UNIX, 'cmd'
may be a sequence, in which case arguments will be passed directly to
the program without shell intervention (as with os.spawnv()). If 'cmd'
is a string it will be passed to the shell (as with os.system()). If
'bufsize' is specified, it sets the buffer size for the I/O pipes. The
file objects (child_stdin, child_stdout_stderr) are returned."""
import popen2
stdout, stdin = popen2.popen4(cmd, bufsize)
return stdin, stdout