Brett Tiplitz added the comment:
Man page currently says as follows: (this does not says it's deprecated or that
files have to be closed on exec)... So I'd think some more comments would
help. And as mentioned, which a user can close his own fd's, the mmap call
creates a special problem since the user can't work around the issue cleanly
though fixed in the subprocess calls.
s.system(command)
Execute the command (a string) in a subshell. This is implemented by
calling the Standard C function system(), and has the same limitations. Changes
to sys.stdin, etc. are not reflected in the environment of the executed command.
On Unix, the return value is the exit status of the process encoded in the
format specified for wait(). Note that POSIX does not specify the meaning of
the return value of the C system() function, so the return value of the Python
function is system-dependent.
On Windows, the return value is that returned by the system shell after
running command, given by the Windows environment variable COMSPEC: on
command.com systems (Windows 95, 98 and ME) this is always 0; on cmd.exe
systems (Windows NT, 2000 and XP) this is the exit status of the command run;
on systems using a non-native shell, consult your shell documentation.
The subprocess module provides more powerful facilities for spawning new
processes and retrieving their results; using that module is preferable to
using this function. See the Replacing Older Functions with the subprocess
Module section in the subprocess documentation for some helpful recipes.
Availability: Unix, Windows.
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<http://bugs.python.org/issue20057>
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