On Fri, Jan 15, 2021 at 4:45 PM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
> On 16/01/21 9:38 am, Guido van Rossum wrote: > > On Fri, Jan 15, 2021 at 10:53 AM Larry Hastings <la...@hastings.org > > <mailto:la...@hastings.org>> wrote: > > > > class OuterCls: > > class InnerCls: > > def method(a:OuterCls.InnerCls=None): pass > > > > We've turned the local reference into a global reference, and we > > already know globals work fine. > > [Above was what Larry wrote, the rest is me. I guess Greg's mailer is having trouble with the GMail-style quoting. :-( ] > I think this is going too far. A static method defined in InnerCls does > > not see InnerCls (even after the class definitions are complete). E.g. > > ``` > > class Outer: > > class Inner: > > @staticmethod > > def foo(): return Inner > > ``` > > If you then call Outer.Inner.foo() you get "NameError: name 'Inner' is > > not defined". > [Greg] > I'm not so sure about that. Conceptually, annotations are evaluated > in the environment existing when the class scope is being constructed. > The fact that we're moving them into a closure is an implementation > detail that I don't think should be exposed. > Yeah, that wasn't very clear, and I'm not 100% sure I got it right. But consider this: ``` class Outer: foo = 1 class Inner: print(foo) ``` This gives "NameError: name 'foo' is not defined". And here there is no forward reference involved, and foo lives in the exactly the same scope/namespace as Inner. The reason for the NameError is that class scopes don't participate in the closure game (an intentional design quirk to avoid methods referencing unqualified class variables). So I still think that Larry's example shouldn't (have to) work. (I agree with Greg on the 'zebra' example.) -- --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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