Sorry for off topic. Isn't this chain.from_iterable just a historical legacy... now we have PEP 448 and I see no differences* between chain(*iterable) vs chain.from_iterable(iterable). Are there?

* chain.from_iterable is a little bit faster for small iterables, but if at that time we had PEP 448, would this small speed benefits be enough to make additional method to chain. I think no.

-gdg

On Thu, May 7, 2020 at 3:24 AM David Mertz <mertz@gnosis.cx> wrote:
The only precedent that jumps out for me is itertools.chain() and itertools.chain.from_iterable(). It's quite likely that something I don't use much has used the same pattern though.

On Wed, May 6, 2020, 8:17 PM Christopher Barker <pythonchb@gmail.com> wrote:
On Wed, May 6, 2020 at 10:31 AM Alex Hall <alex.mojaki@gmail.com> wrote:
zip.shortest(...)  # same as zip(...)
zip.longest(...)
zip.checksame(...)

I presume that zip() would keep its current behavior, yes?

I kind of like this -- is there any precedent for it in the standard library?

The PEP seems to reject this saying:

The actual zip type is an undocumented implementation detail. Adding additional methods or constructors is really a much larger change that is not necessary to achieve the stated goal.

well, yes and no -- the first part indicates that we could totally change the type of the zip, as long as it's a collable that returns an iterator.

Whether adding additional methods is too large a change -- that's totally a matter of opinion.

> Having these alternative 'methods' would be similar to having different functions in itertools,
indeed -- same idea, different namepace.

-CHB

--
Christopher Barker, PhD

Python Language Consulting
  - Teaching
  - Scientific Software Development
  - Desktop GUI and Web Development
  - wxPython, numpy, scipy, Cython
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-leave@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/5EC4BLXEUZWEE2D7PP43WK6BAGEVFRPB/
Code of Conduct: http://python.org/psf/codeofconduct/
_______________________________________________
Python-ideas mailing list -- python-ideas@python.org
To unsubscribe send an email to python-ideas-leave@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/3BOXVZKFRF7APL5IRBWXQSQOLQWTMBPW/
Code of Conduct: http://python.org/psf/codeofconduct/