On Sat, 7 May 2022 at 23:15, Stephen J. Turnbull <stephenjturnbull@gmail.com> 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