On Sat, Aug 1, 2020 at 6:07 AM Ricky Teachey <ri...@teachey.org> wrote: > > On Fri, Jul 31, 2020 at 3:52 PM Marco Sulla <marco.sulla.pyt...@gmail.com> > wrote: >> >> Is it not more simple to add some sequence methods to the dict views (if >> there's a real need)? >> If you do tuple(dict.keys()), you get the sequence of keys in the same >> insertion order of the dict. It seems to me that the duck already exists and >> quacks. > > > The problem with that is these view objects are in fact NOT ducks > (sequences). They are gooses (sets). Gooses don't quack. They honk. >
They are guaranteed to iterate in the same order as the dict, though, unless I'm mistaken. There's been a weaker guarantee for a long time (that iteration order for keys/values/items is consistent and will not change without a dict mutation), and I can't find anywhere that it's now guaranteed to be the same as dict order, but I would be very surprised if list(d) was different from list(d.keys()). So, constructing a tuple or list from the keys or items WILL give you a sequence. Whether that's good enough is another question. For instance, it requires taking a full copy of the dict, even if all you want is a single element from it. 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/QN6BDOBM6KXB3LAVSE34WNTN4T2APBDA/ Code of Conduct: http://python.org/psf/codeofconduct/
