Eryk Sun added the comment:
The error() function in PC/launcher.c should call exit(rc) instead of
ExitProcess(rc). This allows the CRT to terminate properly and flush the stderr
FILE stream. With this change it works as expected:
>>> import subprocess
>>> p = subprocess.Popen(r'amd64\py_d -3.7', stderr=subprocess.PIPE)
>>> p.stderr.read()
b'Requested Python version (3.7) not installed\r\n'
----------
keywords: +patch
nosy: +eryksun
stage: -> patch review
Added file: http://bugs.python.org/file41228/issue25789_1.patch
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