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Description
Bug report
Bug description:
We have project where we record the current value oflocale.LC_NUMERIC, change it to a different value to use a library that needs a particular locale setting, and then restore it to the original value. This stopped working with Python 3.13.3. I suspect this may be a bug, but please correct me if I misunderstood the functionality.
Example with Python 3.13.3:
$dockerrun-itpython:3.13.3Python3.13.3 (main,May92025,23:49:05) [GCC12.2.0]onlinuxType"help","copyright","credits"or"license"formoreinformation.>>>importos,locale>>>os.environenviron({'PATH':'/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin','HOSTNAME':'2e43b79a7135','TERM':'xterm','GPG_KEY':'7169605F62C751356D054A26A821E680E5FA6305','PYTHON_VERSION':'3.13.3','PYTHON_SHA256':'40f868bcbdeb8149a3149580bb9bfd407b3321cd48f0be631af955ac92c0e041','HOME':'/root','LC_CTYPE':'C.UTF-8'})>>>os.environ["LC_ALL"]="C.UTF-8">>>locale.setlocale(locale.LC_ALL,"")'C.UTF-8'>>>locale.getlocale(locale.LC_NUMERIC)('en_US','UTF-8')>>>locale.setlocale(locale.LC_NUMERIC,locale.getlocale(locale.LC_NUMERIC))Traceback (mostrecentcalllast):File"<python-input-5>",line1,in<module>locale.setlocale(locale.LC_NUMERIC,locale.getlocale(locale.LC_NUMERIC))~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File"/usr/local/lib/python3.13/locale.py",line615,insetlocalereturn_setlocale(category,locale)locale.Error:unsupportedlocalesetting
The same example works fine with earlier versions of Python, for example 3.13.2:
$dockerrun-itpython:3.13.2Python3.13.2 (main,Apr82025,04:27:11) [GCC12.2.0]onlinuxType"help","copyright","credits"or"license"formoreinformation.>>>importos,locale>>>os.environenviron({'PATH':'/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin','HOSTNAME':'64800af765e4','TERM':'xterm','GPG_KEY':'7169605F62C751356D054A26A821E680E5FA6305','PYTHON_VERSION':'3.13.2','PYTHON_SHA256':'d984bcc57cd67caab26f7def42e523b1c015bbc5dc07836cf4f0b63fa159eb56','HOME':'/root','LC_CTYPE':'C.UTF-8'})>>>os.environ["LC_ALL"]="C.UTF-8">>>locale.setlocale(locale.LC_ALL,"")'C.UTF-8'>>>locale.getlocale(locale.LC_NUMERIC)('C','UTF-8')>>>locale.setlocale(locale.LC_NUMERIC,locale.getlocale(locale.LC_NUMERIC))'C.UTF-8'
It looks like this may have been caused by the changes in#129647.
CPython versions tested on:
3.13
Operating systems tested on:
No response
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