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default_locale already maps those to en_US_POSIX. parse() did not, so a C locale from the environment raised UnknownLocaleError.
akx
requested changes
Sep 18, 2026
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| # C/POSIX is not a CLDR language. Same mapping default_locale uses. | ||
| posix_stem = identifier.split(".")[0].split("@")[0] | ||
| posix_stem = posix_stem.replace("-", "_") |
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Why is this replace necessary? "C" and "POSIX" don't include dashes or underscores.
| raise TypeError(f"Unexpected value for identifier: {identifier!r}") | ||
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| # C/POSIX is not a CLDR language. Same mapping default_locale uses. | ||
| posix_stem = identifier.split(".")[0].split("@")[0] |
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What's the @ splitting for? The test case doesn't seem to exercise it, and in any case a @ modifier would be in the postfix already split out by .split(".").
Additionally, please use .partition(".") in cases like this for performance.
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Fixes #1236.
default_locale()mapsC,POSIX, andC.UTF-8toen_US_POSIX.Locale.parse()did not, soLocale.parse("C")raisedUnknownLocaleError: unknown locale 'c'. That is the frame in the report.parse()now applies the same mapping (case-insensitive, optional encoding suffix) beforeparse_locale.en_US_POSIXwith a POSIX variant is unchanged.