STINNER Victor <vstin...@python.org> added the comment:
Simpler way to reproduce the issue with t.py script:
---
import test.support
import sys
import _testcapi
print(f"{sys.stdout.encoding=}", file=sys.stderr)
with test.support.SuppressCrashReport():
_testcapi.run_in_subinterp("pass")
---
By default, UTF-8 is used, everything is fine:
-----
C:\> python t.py
sys.stdout.encoding='utf-8'
-----
Disable _WindowsConsoleIO with PYTHONLEGACYWINDOWSSTDIO env var, we get the
issue:
-----
C:\> set PYTHONLEGACYWINDOWSSTDIO=1
C:\> python t.py
Running Debug|x64 interpreter...
sys.stdout.encoding='cp932'
TypeError: codec is unexpected type
Fatal Python error: (...)
-----
Or redirect the output into a program or a file to disable _WindowsConsoleIO to
also reproduce the issue:
-----
C:\> python t.py|more
sys.stdout.encoding='cp932'
TypeError: codec is unexpected type
(...)
-----
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42846>
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