On Sun, Nov 22, 2020 at 5:03 PM Jim J. Jewett <jimjjew...@gmail.com> wrote:
> I think your changed constructor:
>
> class Car:
> def __init__(self, manufacturer, variant):
> self.brand = manufacturer
> self.model = variant
>
> is a particularly good example, and the PEP should specify whether:
> Car("Chrysler", "PT Cruiser")
>
> is matched by:
> Car(brand="Chrysler", mod:=model)
> or:
> Car(manufacturer="Chrysler", mod:=variant)
> or both, or possibly even Frankenstein combinations like:
> Car(brand="Chrysler", mod:=variant)
>
(a) We got rid of the walrus and now spell it using '<Pattern> as
<variable>' instead of '<variable> := <Pattern>".
(b) All your examples have a positional argument following a keyword
argument and that's invalid syntax, in patterns as in expressions. (This
was the only bug in Steven's example that I found, but I didn't bother to
call it out.)
(c) What Ethan said -- after fixing the syntax this does show that the
keywords in class patterns correspond to attributes, not to constructor
arguments (unless those are the same, as they often are, and always for
dataclasses and named tuples).
--
--Guido van Rossum (python.org/~guido)
*Pronouns: he/him **(why is my pronoun here?)*
<http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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