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Apr 25, 2019
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bpo-35537: Document posix_spawn() change in subprocess #11668

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7 changes: 7 additions & 0 deletions Doc/library/subprocess.rst
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Expand Up @@ -567,6 +567,13 @@ functions.
Popen destructor now emits a :exc:`ResourceWarning` warning if the child
process is still running.

.. versionchanged:: 3.8
Popen can use :func:`os.posix_spawn` in some cases for better
performance. On Windows Subsystem for Linux and QEMU User Emulation,
Popen constructor using :func:`os.posix_spawn` no longer raise an
exception on errors like missing program, but the child process fails
with a non-zero :attr:`~Popen.returncode`.


Exceptions
^^^^^^^^^^
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6 changes: 6 additions & 0 deletions Doc/whatsnew/3.8.rst
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Expand Up @@ -709,6 +709,12 @@ Changes in Python behavior
Changes in the Python API
-------------------------

* :class:`subprocess.Popen` can now use :func:`os.posix_spawn` in some cases
for better performance. On Windows Subsystem for Linux and QEMU User
Emulation, Popen constructor using :func:`os.posix_spawn` no longer raise an
exception on errors like missing program, but the child process fails with a
non-zero :attr:`~Popen.returncode`.

* The :meth:`imap.IMAP4.logout` method no longer ignores silently arbitrary
exceptions.

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