On Dec 23, 2021, at 17:09, Guido van Rossum <gu...@python.org> wrote: > > Mark's proposal was > ``` > @Callable > def func(params): pass > ``` > My question is, why does it need `@Callable`? Lukasz proposed just using any > (undecorated) function, with the convention being that the body is `...` (to > which I would add the convention that the function *name* be capitalized, > since it is a type). My question (for Mark, or for anyone who supports > `@Callable`) is why bother with the decorator. It should be easy to teach a > type checker about this: > > ``` > def SomeFn(x: float) -> int: > ... > > def twice(f: SomeFn) -> SomeFn: > return lambda x: f(f(x)) > ```
That seems pretty intuitive to me. The conventions you mention would be just that though, right? I.e. `pass` could be used, but whatever the body is it would be ignored for type checking `twice()` in this case, right? -Barry
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