New submission from Mark Dickinson <[email protected]>:
Ezio Melotti asked (on #python-dev) why the Decimal constructor doesn't
accept decimal digits other than 0-9. As far as I can tell there's no
good reason for it not to. Moreover, the standard on which the decimal
module is based says[1]:
"""It is recommended that implementations also provide additional number
formatting routines (including some which are locale-dependent), and if
available should accept non-European decimal digits in strings."""
All other builtin or standard library numeric types already accept such
digits:
Python 3.2a0 (py3k:74247, Jul 29 2009, 09:28:12)
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from fractions import Fraction
>>> from decimal import Decimal
>>> x = '\uff11\uff10\uff15\uff18\uff15'
>>> x
'１０５８５'
>>> int(x)
10585
>>> float(x)
10585.0
>>> complex(x)
(10585+0j)
>>> Fraction(x)
Fraction(10585, 1)
>>> Decimal(x)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/dickinsm/python/svn/py3k/Lib/decimal.py", line 548, in
__new__
"Invalid literal for Decimal: %r" % value)
File "/Users/dickinsm/python/svn/py3k/Lib/decimal.py", line 3816, in
_raise_error
raise error(explanation)
decimal.InvalidOperation: Invalid literal for Decimal: '１０５８５'
I propose adding support for this in Python 3.2 and (possibly) 2.7. The
change would be for input only: no record of the original form of the
digits would be kept by the Decimal object itself, so that e.g.,
str(Decimal('１０５８５')) would still be '10585'.
[1] See http://speleotrove.com/decimal/daconvs.html
----------
assignee: marketdickinson
components: Library (Lib)
messages: 91030
nosy: ezio.melotti, marketdickinson
severity: normal
status: open
title: Make Decimal constructor accept all unicode decimal digits in input.
type: feature request
versions: Python 3.2
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Python tracker <[email protected]>
<http://bugs.python.org/issue6595>
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