On 13/07/2020 12:28, Henk-Jaap Wagenaar wrote:
No, that would not be impossible but fraught with problems. This is
discussed in the PEP:
https://www.python.org/dev/peps/pep-0622/#algebraic-matching-of-repeated-names
The PEP goes into no detail of what these problems (or "number of
subtleties") are, but it does mention how
we decided to make repeated use of names within the same pattern an
error; we can always relax this restriction later without affecting
backwards compatibility
which does hint at the fact that the problems are not insurmountable
hurdles.
All in all not an urgent feature, but it would be nice to have from the
get-go if there is agreement and it is doable.
@PEP authors: Incidentally, I am eager to start contributing and see
this PEP advance—if there's anything I can do, including possibly
non-code "dirty work" please let me know.
I was thinking of collecting all the objections and points of contention
of the PEP and the current progress on each in one place so that the
pros and cons can be evaluated more clearly. Would that be useful?
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