Just one note:
On Thu, Feb 10, 2022 at 6:56 AM Chris Angelico <ros...@gmail.com> wrote:
> > (2) For the form of the assignment target, I think an analogy with the
> > reception of function arguments could also be considered.
I think so -- maybe only because it's new, but folks are certainly far more
familiar with **kwargs than pattern matching.
> > For an assignment without **rest, the
> > assignment source can just be sliced beforehand.
>
> Yeah, that's something that could be considered, but it's worth noting
> that PEP 622 says that match syntax doesn't demand {**_} for mapping
> patterns.
>
> Extra keys in the subject are ignored even if **rest is not present.
> This is different from sequence pattern, where extra items will cause
> a match to fail. But mappings are actually different from sequences:
> they have natural structural sub-typing behavior, i.e., passing a
> dictionary with extra keys somewhere will likely just work.
Except in unpacking in a function call -- which I this "feels" more like to
me.
-CHB
--
Christopher Barker, PhD (Chris)
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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