david.reitter wrote:
> So I would expect None rather than an IndexError, which is (only?)
> supposed to occur "If a string argument is not used as a group name in
> the pattern".
That is exactly what does happen.
>
> I would expect named groups and numbered groups to be behave the same
> way.
> Where's my mistake?
Using 'maybe' as a group name when the only group in the pattern is called
'm'.
>
>>>> import re
>>>> m = re.match('(?P<m>maybe)?yes', "yes")
>>>> m.group(1)
>>>> m.group('maybe')
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> IndexError: no such group
>
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