[issue45232] ascii codec is used by default when LANG is not set

[Eryk Sun]

Eryk Sun <eryksun at gmail.com> added the comment:

Python 3.7+ doesn't need to explicitly enable UTF-8 mode in this case on POSIX systems. If the locale encoding is the "POSIX" or "C" locale, and "C" locale coercion is not disabled via LC_ALL or PYTHONCOERCECLOCALE=0, the interpreter tries to coerce the LC_CTYPE locale to "C.UTF-8", "C.utf8", or "UTF-8". If these attempts fail, or if coercion is disabled, the interpreter will automatically enable UTF-8 mode, unless that's also explicitly disabled. For example:

    $ unset LANG
    $ unset LC_ALL
    $ unset PYTHONCOERCECLOCALE
    $ unset PYTHONUTF8         
    $ python -c 'import locale; print(locale.getpreferredencoding())'
    UTF-8

    $ PYTHONCOERCECLOCALE=0 python -c 'import locale; print(locale.getpreferredencoding())'
    UTF-8

    $ PYTHONUTF8=0 python -c 'import locale; print(locale.getpreferredencoding())'
    UTF-8

    $ PYTHONCOERCECLOCALE=0 PYTHONUTF8=0 python -c 'import locale; print(locale.getpreferredencoding())'
    ANSI_X3.4-1968

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nosy: +eryksun

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45232>
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