Oscar Benjamin wrote: > Under PEP 634 in general, for any class C, a pattern C(x) matches an object > C(x, y) and there's no way for C to override that. To me that is sufficiently > unintuitive in the abstract that no example is really needed to see where > there is room for improvement.
We originally kicked around (and at one point even implemented) a `__match_args_required__` attribute, which is an integer specifying a minimum required number of positional sub-patterns. For reasons I can't recall, though, it was eventually dropped. It would take care of this, and I imagine it could be quite painless to add it back if there was enough support. Here's a query for related discussions: https://github.com/gvanrossum/patma/issues?q=__match_args_required__ _______________________________________________ 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/JKZUE2BUDZQQHQLZK3IYBUNHYQWYMVA6/ Code of Conduct: http://python.org/psf/codeofconduct/
