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[3.14] gh-106318: Add example for str.isdecimal() (GH-137559) (#141893)

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Co-authored-by: Adorilson Bezerra <adorilson@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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Doc/library/stdtypes.rst
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@ -2073,9 +2073,18 @@ expression support in the :mod:`re` module).
Return ``True`` if all characters in the string are decimal
characters and there is at least one character, ``False``
otherwise. Decimal characters are those that can be used to form
numbers in base 10, e.g. U+0660, ARABIC-INDIC DIGIT
numbers in base 10, such as U+0660, ARABIC-INDIC DIGIT
ZERO. Formally a decimal character is a character in the Unicode
General Category "Nd".
General Category "Nd". For example:
.. doctest::
>>> '0123456789'.isdecimal()
True
>>> '٠١٢٣٤٥٦٧٨٩'.isdecimal() # Arabic-Indic digits zero to nine
True
>>> 'alphabetic'.isdecimal()
False
.. method:: str.isdigit()