17.1.3.6 Replacing popen2.*
Note: If the cmd argument to popen2 functions is a string, the command is executed through /bin/sh. If it is a list, the command is directly executed.
(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
==>
p = Popen(["somestring"], shell=True, bufsize=bufsize,
stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)
(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode)
==>
p = Popen(["mycmd", "myarg"], bufsize=bufsize,
stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)
The popen2.Popen3 and popen2.Popen4 basically works as subprocess.Popen, except that:
- subprocess.Popen raises an exception if the execution fails
- the capturestderr argument is replaced with the stderr
argument.
- stdin=PIPE and stdout=PIPE must be specified.
- popen2 closes all file descriptors by default, but you have to specify close_fds=True with subprocess.Popen.
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Release 2.5, documentation updated on 19th September, 2006.