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Python cannot run in the ja_JP.sjis locale used windows-31j encoding. #102388

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@moriyama

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@moriyama

Bug report

Linux using glibc cannot run Python when ja_JP.sjis locale is set as follows.

$ sudo dnf install glibc-locale-source # RHEL or RHEL compatible Linux distribution$ sudo localedef -f WINDOWS-31J -i ja_JP ja_JP.sjis$ export LANG=ja_JP.SJIS$ python3Python path configuration:  PYTHONHOME = (not set)  PYTHONPATH = (not set)  program name = 'python3'  isolated = 0  environment = 1  user site = 1  import site = 1  sys._base_executable = '/usr/bin/python3'  sys.base_prefix = '/usr'  sys.base_exec_prefix = '/usr'  sys.platlibdir = 'lib64'  sys.executable = '/usr/bin/python3'  sys.prefix = '/usr'  sys.exec_prefix = '/usr'  sys.path = [    '/usr/lib64/python39.zip',    '/usr/lib64/python3.9',    '/usr/lib64/python3.9/lib-dynload',  ]Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encodingPython runtime state: core initializedLookupError: unknown encoding: WINDOWS-31JCurrent thread 0x00007f49d76ee740 (most recent call first):<no Python frame>

The charset name "Windows-31J" is registered in the IANA Charset Registry[1].
Windows-31J is supported by perl[2], php[3], ruby[4], java[5], etc.
Python's cp932 is equivalent to Windows-31J, so I propose to add windows_31j to aliases for cp932.

[1]https://www.iana.org/assignments/charset-reg/windows-31J
[2]https://perldoc.perl.org/Encode::JP
[3]https://www.php.net/manual/en/mbstring.encodings.php
[4]https://docs.ruby-lang.org/ja/latest/class/Encoding.html
[5]https://docs.oracle.com/en/java/javase/19/intl/supported-encodings.html

Your environment

  • CPython versions tested on: 3.9.13, 3.12.0a5+
  • Operating system and architecture: MIRACLE LINUX 8.6 x86_64 (RHEL 8.6 compatible)

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