The "fluent interface" (https://en.wikipedia.org/wiki/Fluent_interface) is popular in many programming languages, including in the sort of "mini-language" Pandas, within portion.
But it is definitely not Pythonic. The Wikipedia article even shows how you *could* do it in Python, but mentions that Guido discourages it. What we get instead is a clear divide between mutating methods on collections that (almost) always return None, and functions like sorted() and reversed() that return copies of the underlying collection/iterable. Of course, there are many methods that don't have functions matching them. Python could have been designed differently, but using the consistency it follows is best. On Sun, Jan 19, 2020, 1:17 PM Siddharth Prajosh <spraj...@gmail.com> wrote: > > > On Sun, Jan 19, 2020 at 10:03 PM Guido van Rossum <gu...@python.org> > wrote: > >> I'm not excited about suggesting the walrus operator when people want to >> chain mutating method calls like this. It results in ugly code with way too >> many parentheses and a distinctly un-Pythonic flavor. I hope the OP doesn't >> go off and infect a whole subcommunity with this idiom. >> > > Not a huge fan the walrus operator, yet. I don't think I'll use it unless > necessary. > > I'll stick to a = list() and then a.append() in this case > > >> On Sat, Jan 18, 2020 at 10:05 PM Inada Naoki <songofaca...@gmail.com> >> wrote: >> >>> On Sun, Jan 19, 2020 at 2:45 PM Siddharth Prajosh <spraj...@gmail.com> >>> wrote: >>> > >>> > Moreover, shouldn't it work? >>> > How do I add that feature in Python? >>> >>> How you can do it with warus operator. >>> >>> >>> (xs := list(range(10))).append(42) >>> >>> xs >>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 42] >>> >>> Regards, >>> >>> -- >>> Inada Naoki <songofaca...@gmail.com> >>> _______________________________________________ >>> 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/24YMTGYKCNFHS2JROYSNSP6MUPZAFUCV/ >>> Code of Conduct: http://python.org/psf/codeofconduct/ >>> >> >> >> -- >> --Guido van Rossum (python.org/~guido) >> *Pronouns: he/him **(why is my pronoun here?)* >> <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/> >> > _______________________________________________ > 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/HEG7CAAG7KMFO2G6I4SOCG4QS7ZJTST2/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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