[issue46183] float function errors on negative number string with comma seperator ex: '-1, 234.0'
Steven D'Aprano added the comment:
Aside: for what it is worth, the British style with a middle dot is also not
supported: float('1ยท234') also raises ValueError.
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[issue46183] float function errors on negative number string with comma seperator ex: '-1, 234.0'
Steven D'Aprano added the comment:
The behaviour is correct and not a bug. Commas are not supported when
converting strings to float.
The allowed format for floats as strings is described in the docs:
https://docs.python.org/3/library/functions.html#float
By the way, the negative sign is irrelevant. Commas are not supported
regardless of whether there is a negative sign or not.
The difficulty with commas is that it is ambiguous whether float('1,234')
should interpret the comma as British/American digit grouping separator, and
return 1234.0, or as the European decimal point, and return 1.234. For good or
bad, Python has a bias towards English (like most programming languages) and so
it chooses to only recognise the decimal point as a dot in the British/American
style, and reject the comma.
If you want to support European-style commas as the decimal point, the easiest
way is to call float('1,234'.replace(',', '.'))
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nosy: +steven.daprano
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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[issue46183] float function errors on negative number string with comma seperator ex: '-1, 234.0'
New submission from syed shah :
>>> float ('-1,234')
Traceback (most recent call last):
File "", line 1, in
ValueError: could not convert string to float: '-1,234'
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components: Library (Lib)
messages: 409202
nosy: jj.github.jj
priority: normal
severity: normal
status: open
title: float function errors on negative number string with comma seperator ex:
'-1,234.0'
versions: Python 3.9
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