On Tue, Jan 12, 2021 at 11:31 AM Jim J. Jewett <jimjjew...@gmail.com> wrote:
> Larry Hastings wrote: > > The control-flow exclusion is for /module//attribute/ or /class > > attribute/ annotations: > > class C: > > if random.random() > 0.5: > > my_attr:int=3 > > else: > > my_attr2:float=3.5 > > That very example would be helpful in the FAQ, though I understand if > you're concerned about making a minor sub-section seem too long. > This elucidates a crucial point to me: Larry's proposal looks at the source code of the annotations. > If I understand correctly, the problem is that you can't store multiple > alternative annotations on my_attr. Therefore: > > class C: > my_attr:(int if random.random > 0.5 else float) > > should be OK, because there is only a single annotation. > Does that mean that the generated function would contain the entire expression `(int if random.random > 0.5 else float)`? I guess that's what it has to mean. But the PEP only uses such simple examples that it's easy to miss this. -- --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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