See https://sourcegraph.com/search?q=context:global+lang:python+%5C%5B%5Cs*:%5Cs*%28i%7Cj%7Ck%7Cind%7Cindex%29%5Cs*%5C%5D%5Cs*%5C%2B%5Cs*%5C%28.*%5C%2C%5C%29%5Cs*%5C%2B%5Cs*%5B%5Cw%5C.%5D%2B%5C%5B%5Cs*%28i%7Cj%7Ck%7Cind%7Cindex%29%5Cs*%5C%2B%5Cs*1%5Cs*:%5Cs*%5C%5D&patternType=regexp
and https://sourcegraph.com/search?q=context:global+lang:python+%3D%5Cs*list%5C%28%5B%5Cw%5C.%5D%2B%5C%29%5Cs*%5Cw%2B%5C%5B%5Cw%2B%5C%5D%5Cs*%3D%5Cs*%5B%5Cw%5C.%5D%2B%5Cs*%5B%5Cw%5C.%5D%2B%5Cs*%3D%5Cs*tuple%5C%28%5Cw%2B%5C%29&patternType=regexp > Yes, and dataclasses and namedtuples support this concept very nicely. You > still haven't shown why neither works. 1. They're less efficient, as Christopher pointed out long ago. 2. They're not sequences, so conceptually the wrong tool for the job. > it definitely seems like a good use-case for a dataclass. See above. > Repeatedly stating that it has to be immutable, has to not be a namedtuple, > has to not be a dataclass, and has to have a replace method, doesn't make it > true. See above. ------- Original Message ------- On Monday, March 14th, 2022 at 8:30 AM, Chris Angelico <ros...@gmail.com> wrote: > On Sat, 12 Mar 2022 at 07:38, wfdc w...@protonmail.com wrote: > > > > you haven't shown us what your use-case actually is > > > > Any use-case where you'd want to modify an entry of an immutable sequence. > > That doesn't answer the question any more than your original code > > does. You're still starting with the assumption that you want to use a > > tuple, and using that as proof that you need to use a tuple. > > Show us your ACTUAL use case, your actual code, and why you can't use > > either a list or a namedtuple. Stop assuming that you are correct > > before you begin, because we don't agree that a tuple is necessary. > > You have not shown us any code, only made this repeated assertion and > > then wondered why we don't believe you. > > > Modifying an immutable datastructure is not a contradictory statement. In > > fact, there's a whole literature on it. See > > > > https://en.wikipedia.org/wiki/Purely_functional_data_structure > > > > https://en.wikipedia.org/wiki/Persistent_data_structure > > Yes, and dataclasses and namedtuples support this concept very nicely. > > You still haven't shown why neither works. > > > As Marco Sulla pointed, out, "Performance apart, this will allow you to > > code in functional style more easily." > > > > namedtuple's ._replace method is an existing example (as is record updating > > in Haskell, which is a purely functional language, with the attending > > benefits of immutability). > > > > For me specifically, my latest use-case is in a game-theoretic setting > > where the tuple represents a strategy profile. But the details of that > > would take us far beyond the scope of the discussion. > > I don't understand how a strategy profile has to be a tuple. In fact, > > particularly since you're wanting to replace one part of it, it > > definitely seems like a good use-case for a dataclass. > > > > whether it would actually be more appropriate for a list instead > > > > Lists are not immutable, so they fail the criteria. > > Why? > > Do you see how you are still failing to show any actual code, and thus > > any actual demonstration of why a tuple is necessary? > > Repeatedly stating that it has to be immutable, has to not be a > > namedtuple, has to not be a dataclass, and has to have a replace > > method, doesn't make it true. > > 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/6MZTLI4I42ZEDJATKM5WDYHMSNEOW6IH/ > > Code of Conduct: http://python.org/psf/codeofconduct/ _______________________________________________ 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/VKCBA6CM3YTW4F6PPJIPEALIZI6FZUGE/ Code of Conduct: http://python.org/psf/codeofconduct/
