Difference between str.isdigit() and str.isdecimal() in Python 3
Ian Kelly
ian.g.kelly at gmail.com
Wed May 16 13:02:22 EDT 2012
On Wed, May 16, 2012 at 10:24 AM, Ulrich Eckhardt <doomster at knuut.de> wrote:
> Marco wrote:
>> >>> '123'.isdecimal(), '123'.isdigit()
>> (True, True)
>> >>> print('\u0660123')
>> ٠123
>> >>> '\u0660123'.isdigit(), '\u0660123'.isdecimal()
>> (True, True)
>> >>> print('\u216B')
>> Ⅻ
>> >>> '\u216B'.isdecimal(), '\u216B'.isdigit()
>> (False, False)
>> [chr(a) for a in range(0x20000) if chr(a).isdigit()]
>> Congratulations, you found a bug! Or maybe not, it all depends on whether
> Roman numbers are considered digits or not. I could imagine there being a
> difference.
They're not. The word "digit" specifically refers to the symbols used
by a positional numeral system, e.g. Arabic numerals. Roman numerals
are not a positional system. The word "decimal" in this case more
specifically means a digit character that is actually suitable for
using to compose a decimal number.
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