New submission from James Emerton <ja...@emerton.info>:
We use locale.format('%.2f', x, True) to convert Decimal values to strings for
display. Unfortunately, the locale module is using %-formatting to generate the
initial string before applying locale specific formatting. As a result, any
value which cannot be accurately represented as a float will produce incorrect
results.
I've built some formatting that uses new-style string formatting (and some
internal locale functions) which corrects the problem.
Unfortunately, making this change in the locale module would require converting
the input format string to the new syntax, so '%.2f' would become '{:.2f}'.
See also #33731
----------
components: Library (Lib)
messages: 322885
nosy: jemerton
priority: normal
severity: normal
status: open
title: locale.format() and locale.format_string() cast Decimals to float
versions: Python 3.6, Python 3.7, Python 3.8
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34311>
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