On 03/08/2020 17:37, MRAB wrote:
[snip]
A thought occurred to me. By default, the current rules of the PEP could apply, but why not allow prefixing with "as" for a capture and "is" for a value?

Yes, I know, comparison of the values is not by identity, but "is" is a short keyword that already exists and matches up with "as".

What about 'match'?  Not as short, but fairly intuitive:

    case (x, y, match Z):
        print(f'A point whose z-coordinate equals {Z}')
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