On Sun, Jul 12, 2020 at 10:30 AM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote: > > Just had another thought about marking assignment targets. > > The PEP currently forbids repeating bound names in a pattern > to avoid raising expectations that > > case Point(x, x): > > would match only if the two arguments were equal. > > But if assignment targets were marked, we could write this as > > case Point(?x, x): > > and it would work as expected. >
Hang on. Matching happens before assignment, so this should use the previous value of x for the matching. At least, that's my understanding. If you do something like: case Point(x, 2): it won't assign x unless the second coordinate is 2, right? ChrisA _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/C3L6EUY5SAMWHSDOHNQJLWXPUJ67A4AQ/ Code of Conduct: http://python.org/psf/codeofconduct/
