On 2019-03-31 16:48, David Mertz wrote:
The only reason I would support the idea would be to allow multiple
suffixes (or prefixes). Otherwise, it just does too little for a new
method. But adding that capability of startswith/endswith makes the cut
off something easy to get wrong and non-trivial to implement.
That said, I really like Brandt's ideas of expanding the signature of
.lstrip/.rstrip instead.
mystring.rstrip("abcd") # remove any of these single character suffixes
It removes _all_ of the single character suffixes.
mystring.rstrip(('foo', 'bar', 'baz')) # remove any of these suffixes
In keeping with the current behaviour, it would strip _all_ of these
suffixes.
Yes, the semantics or removals where one is a substring of another would
need to be decided. As long as it's documented, any behavior would be
fine. Most of the time the issue would be moot.
> On Sun, Mar 31, 2019, 4:36 AM Steven D'Aprano <st...@pearwood.info
<mailto:st...@pearwood.info>> wrote:
On Sun, Mar 31, 2019 at 04:48:36PM +1100, Chris Angelico wrote:
> Regardless of the method name, IMO the functions should accept a
tuple
> of test strings, as startswith/endwith do. That's a feature that
can't
> easily be spelled in a one-liner. (Though stacked suffixes shouldn't
> all be removed - "asdf.jpg.png".cutsuffix((".jpg", ".png")) should
> return "asdf.jpg", not "asdf".)
There's a slight problem with that: what happens if more than one
suffix
matches? E.g. given:
"musical".lcut(('al', 'ical'))
should the suffix "al" be removed, leaving "music"? (First match wins.)
Or should the suffix "ical" be removed, leaving "mus"? (Longest match
wins.)
I don't think we can decide which is better, and I'm not keen on a
keyword argument to choose one or the other, so I suggest we stick to
the 90% solution of only supporting a single suffix.
We can always revisit that in the future.
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