New submission from Marco Sulla <launchpad....@marco.sulla.e4ward.com>:
I think a tuple comprehension could be very useful. Currently, the only way to efficiently create a tuple from a comprehension is to create a list comprehension (generator comprehensions are more slow) and convert it with `tuple()`. A tuple comprehension will do exactly the same thing, but without the creation of the intermediate list. IMHO a tuple comprehension can be very useful, because: 1. there are many cases in which you create a list with a comprehension, but you'll never change it later. You could simply convert it with `tuple()`, but it will require more time 2. tuples uses less memory than lists 3. tuples can be interned As syntax, I propose (* expr for x in iterable *) with absolutely no blank character between the character ( and the *, and the same for ). Well, I know, it's a bit strange syntax... but () are already taken by generator comprehensions. Furthermore, the * remembers a snowflake, and tuples are a sort of "frozenlists". ---------- components: Interpreter Core messages: 362888 nosy: Marco Sulla priority: normal severity: normal status: open title: Tuple comprehension versions: Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39784> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
