> that can be used (eg) for indexing
Even without it being used in as complicated a way as that it's *still* not
backward compatible because of the trivial case, as foo.endswith("") is
True.
On Sun, Aug 8, 2021 at 11:55 PM Chris Angelico <ros...@gmail.com> wrote:
> On Mon, Aug 9, 2021 at 1:42 PM <fgalla...@gmail.com> wrote:
> >
> > This is a proposal to change the behaviour of the startswith() and
> > endswith() methods for str, bytes and bytearray objects, making them
> > return the matched value instead of the True boolean.
>
> Unfortunately this would break backward compatibility, since it's
> currently guaranteed that they return precisely True or False, and
> that can be used (eg) for indexing. To maintain that, you'd have to
> create new methods which return the matched value or None (and can
> then define startswith/endswith as the boolification of that). For
> instance:
>
> domain.findsuffix((".fr", ".com", ".org"))
>
> ChrisA
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