As a tangential follow-up to my thought that _"the `:=` walrus operator seems to be usable as a substitute for new syntax"_, you can actually build a seemingly complete (if somewhat error-prone) _run-time_ pattern matching API using it:
https://gist.github.com/eric-wieser/da679ff9b1b1e99aa660d54cb0dbd517 Taking the `group_shapes` example from the PEP, the gist lets you write ```python g = group_shapes() if g in M(([], [point := M[Point](x := M._, y := M._), *(other := M._)])): print(f"Got {point.value} in the second group") process_coordinates(x.value, y.value) elif g in M(...): # etc ``` This isn't an argument against adding new syntax, but I figured those discussing the PEP might be interested in what can already be done with today's syntax. Eric _______________________________________________ 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/DNVHVJ5RHZYUKMXTGWLE2ZVNA4WPOUWE/ Code of Conduct: http://python.org/psf/codeofconduct/
