Can I recommend going slow here? This is a very interesting topic where many languages have gone before. I liked Daniel F Moisset's analysis about the choices of a language designer and his conclusion that match should be a statement.
I just noticed the very similar proposal for JavaScript linked to by the OP: https://github.com/tc39/proposal-pattern-matching -- this is more relevant than what's done in e.g. F# or Swift because Python and JS are much closer. (Possibly Elixir is also relevant, it seems the JS proposal borrows from that.) A larger topic may be how to reach decisions. If I've learned one thing from PEP 572 it's that we need to adjust how we discuss and evaluate proposals. I'll think about this and start a discussion at the Language Summit about this. -- --Guido van Rossum (python.org/~guido)
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