On Tue, Dec 1, 2020 at 10:25 AM Marco Sulla <marco.sulla.pyt...@gmail.com> wrote: > > On Mon, 30 Nov 2020 at 23:26, David Mertz <me...@gnosis.cx> wrote: > > Somehow "dire" doesn't strike me as the right word.... Maybe you were > > looking for "conceivably useful in niche cases."? > > Well, I think const can be useful for: > * multiprocessing. Now, for example, dict is passed between processes > using MappingProxyType, which is slow. > * avoid side effects. I expect that my object will not change and I > want to be sure I'll not change it by mistake. Mistake that I made a > lot of times. > * contract. A function marks a parameter as const will guarantee that > the object will not be changed. It's something complementar to > annotations. > * possible future speed improvements. For example, if an iterable is > const, you can skip a lot of checks about mutability on iteration and > make it more fast.
Are you assuming that "const" means "will not be rebound" or "is immutable"? Or both? 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/YFDQCVIIJAXAUJ54C7C4D7L6WQFKJ3EI/ Code of Conduct: http://python.org/psf/codeofconduct/
