[Python-ideas] New explicit methods to trim strings

[David Mertz]

I like this idea quite a lot. I do not think of anything it works best at
first consideration.

On Sat, Mar 30, 2019, 8:28 PM Brandt Bucher <brandtbucher at gmail.com> wrote:

>
> > One thing I love about .startswith() and .endswith() is matching
> multiple options. It's a little funny the multiple options must be a tuple
> exactly (not a list, not a set, not an iterator), but whatever. It would be
> about to lack that symmetry in the .cut_suffix() method.
> >
> > E.g now:
> >
> >   if fname.endswith(('.jpg', '.png', '.gif)): ...
> >
> > I'd expect to be able to do:
> >
> >   basename = fname.cut_suffix(('.jpg', '.png', '.gif))
>
> An idea worth considering: one can think of the “strip” family of methods
> as currently taking an iterable of strings as an argument (since a string
> is itself an sequence of strings):
>
> >>> "abcd".rstrip("dc")
> 'ab'
>
> It would not be a huge logical leap to allow them to take any iterable.
> Backward compatible, no new methods:
>
> >>> fname.rstrip(('.jpg', '.png', '.gif'))
>
> It even, in my opinion, can clarify "classic" strip/rstrip/lstrip usage:
>
> >>> "abcd".rstrip(("d", "c"))
> 'ab'
>
> Maybe I’m missing a breaking case though, or this isn’t as clear for
> others. Thoughts?
>
> Brandt
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