[New-bugs-announce] [issue31900] UnicodeDecodeError in localeconv() makes test_float fail with glibc 2.26.90

[Charalampos Stratakis]

New submission from Charalampos Stratakis <cstratak at redhat.com>:

Original bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1484497

It seems that on the development branch of Fedora, when we updated glibc from 2.26 to 2.26.90, test_float_with_comma started failing.

Details from the original bug report:

Under certain circumstances, when LC_NUMERIC is fr_FR.ISO8859-1 but LC_ALL is C.UTF-8, locale.localeconv() fails with
    UnicodeDecodeError: 'locale' codec can't decode byte 0xa0 in position 0: Invalid or incomplete multibyte or wide character

Apparently, the thousands separator (or something else) in the lconv is "\xa0" (unbreakable space in fr_FR.ISO8859-1), and it's being decoded with UTF-8.

This is tripped by Python's test suite, namely test_float.GeneralFloatCases.test_float_with_comma

----------
components: Tests
messages: 305227
nosy: cstratak
priority: normal
severity: normal
status: open
title: UnicodeDecodeError in localeconv() makes test_float fail with glibc 2.26.90
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31900>
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