Sebastian Bank <[email protected]> added the comment:
AFAIU, this change broke the following usage of subprocess on Windows
(re-using a subprocess.STARTUPINFO instance to hide the command window):
import os, subprocess
STARTUPINFO = subprocess.STARTUPINFO()
STARTUPINFO.dwFlags |= subprocess.STARTF_USESHOWWINDOW
STARTUPINFO.wShowWindow = subprocess.SW_HIDE
# raises OSError: [WinError 87]
# in the second loop iteration starting with Python 3.7
for i in range(2):
print(i)
with open(os.devnull, 'w') as stderr:
subprocess.check_call(['attrib'], stderr=stderr,
startupinfo=STARTUPINFO)
AFAICT, this works on Python 2.7, 3.4, 3.5, and 3.6
----------
nosy: +xflr6
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<https://bugs.python.org/issue19764>
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