[issue26483] docs unclear on difference between str.isdigit() and str.isdecimal()

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Yes. For details you need to read The Unicode Standard.

And every decimal character is accepted by the int() constructor, but 
non-decimal digits are not.

>>> for d in decimals: x = int(d)
... 
>>> for d in set(digits) - set(decimals):
...     try:
...         int(d)
...     except ValueError:
...         pass
...     else:
...         raise AssertionError
...

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