On Sat, 7 May 2022 at 23:15, Stephen J. Turnbull
<[email protected]> wrote:
>
> Steven D'Aprano writes:
>
> > What would this do?
> >
> > def __init__(self, spam.x, eggs.y): pass
> >
> > How about this?
> >
> > def __init__(self, x, x.y): pass
>
> IMO, both of those should be errors. This syntax only makes much
> sense for the first formal argument of a method definition, because
> it's the only formal argument which has a fixed definition. The form
> "def foo(self, x, x.y)" has an interpretation, I guess, but
>
> def foo(self, x, y):
> x.y = y
>
> is not a pattern I can recall ever seeing, and it could be relatively
> easily relaxed if it were requested enough. On the other hand, folks
> do frequently request a way to DRY out long suites of "self.x = x"
> assignments.
>
I'd define it very simply. For positional args, these should be
exactly equivalent:
def func(self, x, x.y):
...
def func(*args):
self, x, x.y = args
...
The logical extension to kwargs would work in natural parallel.
ChrisA
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