There's a difference between TypeVar('T', bound=Callable) and TypeVar('T', bound=Callable[..., Any]) #1501

gvanrossum · 2016-05-06T23:44:15Z

@rwbarton Any idea? I found this in our internal code base, haven't come up with a small repro yet. Plain Callable is supposed to mean the same as Callable[..., Any] but in this case it's apparently not the case. I had some code that gave a long list of errors when I used the shorter form. OTOH I had some other code where it worked...

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rwbarton · 2016-05-07T23:03:50Z

I can reproduce this by making that change to test testBoundOnDecorator. Will investigate.

The old definition of Callable was the type of a function defined as def f(*args: Any, **kwargs: Any) -> Any: ... which is not the form of a general function, only one that can accept an arbitrary number of arguments. Fixes python#1501.

The old definition of Callable was the type of a function defined as def f(*args: Any, **kwargs: Any) -> Any: ... which is not the form of a general function, only one that can accept an arbitrary number of arguments. Fixes #1501.

rwbarton mentioned this issue May 7, 2016

Treat bare Callable as Callable[..., Any] #1505

Merged

gvanrossum closed this as completed in #1505 May 8, 2016

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There's a difference between TypeVar('T', bound=Callable) and TypeVar('T', bound=Callable[..., Any]) #1501

There's a difference between TypeVar('T', bound=Callable) and TypeVar('T', bound=Callable[..., Any]) #1501

gvanrossum commented May 6, 2016

rwbarton commented May 7, 2016

Uh oh!

Uh oh!

There's a difference between TypeVar('T', bound=Callable) and TypeVar('T', bound=Callable[..., Any]) #1501

There's a difference between TypeVar('T', bound=Callable) and TypeVar('T', bound=Callable[..., Any]) #1501

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gvanrossum commented May 6, 2016

rwbarton commented May 7, 2016

Uh oh!