10000 [3.9] bpo-23750: Document os-system, subprocess. Patch by Martin Panter. (GH-26016) by miss-islington · Pull Request #26041 · python/cpython · GitHub
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[3.9] bpo-23750: Document os-system, subprocess. Patch by Martin Panter. (GH-26016) #26041

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Merged
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May 11, 2021
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[3.9] bpo-23750: Document os-system, subprocess. Patch by Martin Panter. (GH-26016) #26041

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8 changes: 4 additions & 4 deletions Doc/library/os.rst
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Expand Up @@ -3965,12 +3965,12 @@ written in Python, such as a mail server's external command delivery program.
the Standard C function :c:func:`system`, and has the same limitations.
Changes to :data:`sys.stdin`, etc. are not reflected in the environment of
the executed command. If *command* generates any output, it will be sent to
the interpreter standard output stream.
the interpreter standard output stream. The C standard does not
specify the meaning of the return value of the C function, so the return
value of the Python function is system-dependent.

On Unix, the return value is the exit status of the process encoded in the
format specified for :func:`wait`. Note that POSIX does not specify the
meaning of the return value of the C :c:func:`system` function, so the return
value of the Python function is system-dependent.
format specified for :func:`wait`.

On Windows, the return value is that returned by the system shell after
running *command*. The shell is given by the Windows environment variable
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8 changes: 7 additions & 1 deletion Doc/library/subprocess.rst
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Expand Up @@ -1268,11 +1268,17 @@ Replacing :func:`os.system`

sts = os.system("mycmd" + " myarg")
# becomes
sts = call("mycmd" + " myarg", shell=True)
retcode = call("mycmd" + " myarg", shell=True)

Notes:

* Calling the program through the shell is usually not required.
* The :func:`call` return value is encoded differently to that of
:func:`os.system`.

* The :func:`os.system` function ignores SIGINT and SIGQUIT signals while
the command is running, but the caller must do this separately when
using the :mod:`subprocess` module.

A more realistic example would look like this::

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