On Sat, May 2, 2020 at 5:21 AM Soni L. <fakedme...@gmail.com> wrote: > > > > On 2020-05-01 3:41 p.m., Chris Angelico wrote: > > On Sat, May 2, 2020 at 4:38 AM Soni L. <fakedme...@gmail.com> wrote: > > > > > > > > > > > > On 2020-05-01 3:10 p.m., Brandt Bucher wrote: > > > > I have pushed a first draft of PEP 618: > > > > > > > > https://www.python.org/dev/peps/pep-0618 > > > > > > > > Please let me know what you think – I'd love to hear any *new* feedback > > > > that hasn't yet been addressed in the PEP! > > > > > > What about using an optional kwarg for a handler for mismatched lengths? > > > I made a post about it on the other thread and it's not addressed in the > > > PEP. It'd make zip capable of doing zip_shortest, zip_equal (aka > > > zip(strict=True)) and zip_longest, it's not stringly-typed, and it's > > > user-extensible. Something along the lines of zip(foo, bar, baz, > > > and_then=lambda consumed_items, iters: ...). > > > > > > > YAGNI. > > examples: > > # iterates in chunks, e.g. a very large file that wouldn't fit all in RAM > zip(*[iter(x)]*32, and_then=lambda res, _: (yield res))
I'm honestly not sure how useful this really is in practice. Iterating over a file is already going to be chunked. What do you gain by wrapping it up in an opaque zip call? > # strict zip > sentinel = object() > def zip_eq(res, iters): > if res or any(next(x, sentinel) is not sentinel for x in iters): > raise ValueError > zip(a, b, c, and_then=zip_eq) > # this would ideally be zip.strict e.g. zip(a, b, c, > and_then=zip.strict), but w/e. So.... a messier and noisier spelling of what's already in this proposal... > # normal (shortest) zip but using an explicit function > def no_op(*args, **kwargs): > pass > zip(a, b, c, and_then=no_op) > ... and a messier and noisier spelling of what we already have. I say again, YAGNI. Give an actual use-case for the excessive generality of your proposal - namely, the ability to provide a custom function. And show that it's better with zip than just with a custom generator function. ChrisA _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/UAQGBSUUFSQJRE56VGTHVXAHCJHUAYTM/ Code of Conduct: http://python.org/psf/codeofconduct/
