Digits int() doesn’t dig

Some time ago I wrote in More Than Just ASCII Digits about all the unicode characters Python’s int() function converts to numbers.

Recently I’ve discovered a discrepancy between those characters and the isdigit() method — there are characters where isdigit() returns True but int() does not convert them.

To make a list of those characters the program from the other blog entry was first ported to Python 3 and then changed to list all characters that are digits according to the isdigit() method, but raise a ValueError with int():

#!/usr/bin/env python3
import sys
import unicodedata


def main():
    for i in range(sys.maxunicode + 1):
        character = chr(i)
        try:
            int(character)
        except ValueError:
            if character.isdigit():
                name = unicodedata.name(character).lower()
                print(f'{character},{i:x},{name}')
        else:
            assert character.isdigit()


if __name__ == '__main__':
    main()

The assert in there isn’t triggered, which tells us all characters that can be converted actually have the „is digit“ property.

Here is the result:

All characters that are digits but can’t be converted by int().

Character	Codepoint (hex)	Name
²	b2	superscript two
³	b3	superscript three
¹	b9	superscript one
፩	1369	ethiopic digit one
፪	136a	ethiopic digit two
፫	136b	ethiopic digit three
፬	136c	ethiopic digit four
፭	136d	ethiopic digit five
፮	136e	ethiopic digit six
፯	136f	ethiopic digit seven
፰	1370	ethiopic digit eight
፱	1371	ethiopic digit nine
᧚	19da	new tai lue tham digit one
⁰	2070	superscript zero
⁴	2074	superscript four
⁵	2075	superscript five
⁶	2076	superscript six
⁷	2077	superscript seven
⁸	2078	superscript eight
⁹	2079	superscript nine
₀	2080	subscript zero
₁	2081	subscript one
₂	2082	subscript two
₃	2083	subscript three
₄	2084	subscript four
₅	2085	subscript five
₆	2086	subscript six
₇	2087	subscript seven
₈	2088	subscript eight
₉	2089	subscript nine
①	2460	circled digit one
②	2461	circled digit two
③	2462	circled digit three
④	2463	circled digit four
⑤	2464	circled digit five
⑥	2465	circled digit six
⑦	2466	circled digit seven
⑧	2467	circled digit eight
⑨	2468	circled digit nine
⑴	2474	parenthesized digit one
⑵	2475	parenthesized digit two
⑶	2476	parenthesized digit three
⑷	2477	parenthesized digit four
⑸	2478	parenthesized digit five
⑹	2479	parenthesized digit six
⑺	247a	parenthesized digit seven
⑻	247b	parenthesized digit eight
⑼	247c	parenthesized digit nine
⒈	2488	digit one full stop
⒉	2489	digit two full stop
⒊	248a	digit three full stop
⒋	248b	digit four full stop
⒌	248c	digit five full stop
⒍	248d	digit six full stop
⒎	248e	digit seven full stop
⒏	248f	digit eight full stop
⒐	2490	digit nine full stop
⓪	24ea	circled digit zero
⓵	24f5	double circled digit one
⓶	24f6	double circled digit two
⓷	24f7	double circled digit three
⓸	24f8	double circled digit four
⓹	24f9	double circled digit five
⓺	24fa	double circled digit six
⓻	24fb	double circled digit seven
⓼	24fc	double circled digit eight
⓽	24fd	double circled digit nine
⓿	24ff	negative circled digit zero
❶	2776	dingbat negative circled digit one
❷	2777	dingbat negative circled digit two
❸	2778	dingbat negative circled digit three
❹	2779	dingbat negative circled digit four
❺	277a	dingbat negative circled digit five
❻	277b	dingbat negative circled digit six
❼	277c	dingbat negative circled digit seven
❽	277d	dingbat negative circled digit eight
❾	277e	dingbat negative circled digit nine
➀	2780	dingbat circled sans-serif digit one
➁	2781	dingbat circled sans-serif digit two
➂	2782	dingbat circled sans-serif digit three
➃	2783	dingbat circled sans-serif digit four
➄	2784	dingbat circled sans-serif digit five
➅	2785	dingbat circled sans-serif digit six
➆	2786	dingbat circled sans-serif digit seven
➇	2787	dingbat circled sans-serif digit eight
➈	2788	dingbat circled sans-serif digit nine
➊	278a	dingbat negative circled sans-serif digit one
➋	278b	dingbat negative circled sans-serif digit two
➌	278c	dingbat negative circled sans-serif digit three
➍	278d	dingbat negative circled sans-serif digit four
➎	278e	dingbat negative circled sans-serif digit five
➏	278f	dingbat negative circled sans-serif digit six
➐	2790	dingbat negative circled sans-serif digit seven
➑	2791	dingbat negative circled sans-serif digit eight
➒	2792	dingbat negative circled sans-serif digit nine
𐩀	10a40	kharoshthi digit one
𐩁	10a41	kharoshthi digit two
𐩂	10a42	kharoshthi digit three
𐩃	10a43	kharoshthi digit four
𐹠	10e60	rumi digit one
𐹡	10e61	rumi digit two
𐹢	10e62	rumi digit three
𐹣	10e63	rumi digit four
𐹤	10e64	rumi digit five
𐹥	10e65	rumi digit six
𐹦	10e66	rumi digit seven
𐹧	10e67	rumi digit eight
𐹨	10e68	rumi digit nine
𑁒	11052	brahmi number one
𑁓	11053	brahmi number two
𑁔	11054	brahmi number three
𑁕	11055	brahmi number four
𑁖	11056	brahmi number five
𑁗	11057	brahmi number six
𑁘	11058	brahmi number seven
𑁙	11059	brahmi number eight
𑁚	1105a	brahmi number nine
🄀	1f100	digit zero full stop
🄁	1f101	digit zero comma
🄂	1f102	digit one comma
🄃	1f103	digit two comma
🄄	1f104	digit three comma
🄅	1f105	digit four comma
🄆	1f106	digit five comma
🄇	1f107	digit six comma
🄈	1f108	digit seven comma
🄉	1f109	digit eight comma
🄊	1f10a	digit nine comma

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