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bpo-40280: Use presence of msvcrt module to detect Windows by tiran · Pull Request #30930 · python/cpython · GitHub

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bpo-40280: Use presence of msvcrt module to detect Windows #30930

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Merged
miss-islington merged 2 commits into from
Jan 27, 2022
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bpo-40280: Use presence of msvcrt module to detect Windows #30930

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bpo-40280: Use presence of msvcrt module to detect Windows
tiran Jan 26, 2022
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tiran Jan 27, 2022
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9 changes: 7 additions & 2 deletions Lib/subprocess.py
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Expand Up @@ -65,10 +65,15 @@
# NOTE: We intentionally exclude list2cmdline as it is
# considered an internal implementation detail. issue10838.

_mswindows = sys.platform == "win32"
# use presence of msvcrt to detect Windows-like platforms (see bpo-8110)
try:
import msvcrt
except ModuleNotFoundError:
_mswindows = False
else:
_mswindows = True

if _mswindows:
import msvcrt
import _winapi
from _winapi import (CREATE_NEW_CONSOLE, CREATE_NEW_PROCESS_GROUP,
STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
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4 changes: 2 additions & 2 deletions Misc/NEWS.d/next/Library/2022-01-16-14-07-14.bpo-40280.LtFHfF.rst
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@@ -1,4 +1,4 @@
:mod:`subprocess` now imports Windows-specific imports when
``sys.platform == "win32"`` and POSIX-specific imports on all other
``msvcrt`` module is available, and POSIX-specific imports on all other
platforms. This gives a clean exception when ``_posixsubprocess`` is not
available (e.g. Emscripten browser target) and it's slightly faster, too.
available (e.g. Emscripten browser target).
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