On Tue., 3 Nov. 2020, 8:07 am Ethan Furman, <et...@stoneleaf.us> wrote:
> On 11/2/20 1:52 PM, Glenn Linderman wrote: > > On 11/2/2020 1:42 PM, Guido van Rossum wrote: > >> But we feel that `case x, x` can easily be misunderstood as "a tuple of > two equal values" > > > > So what _is_ the syntax for "a tuple of two equal values" ? > > > > case x, ?x: # comes to mind (not that it is in the PEP :)) > > Using a guard statement: > > case x, y if x == y > This example made me realise that I need to add test cases for "case x, ==x:" and "case x, is x:" to PEP 642's reference implementation (and text to the PEP pointing out that explicit constraints can help address the pattern back-reference problem). Cheers, Nick. > > > >
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