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Add example for async functions. 

Fixes: https://github.com/python/typing/issues/424
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Sam Bull 2020-05-25 15:55:35 +01:00 committed by GitHub
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@ -165,6 +165,10 @@ For example::
on_error: Callable[[int, Exception], None]) -> None: on_error: Callable[[int, Exception], None]) -> None:
# Body # Body
async def on_update(value: str) -> None:
# Body
callback: Callable[[str], Awaitable[None]] = on_update
It is possible to declare the return type of a callable without specifying It is possible to declare the return type of a callable without specifying
the call signature by substituting a literal ellipsis the call signature by substituting a literal ellipsis
for the list of arguments in the type hint: ``Callable[..., ReturnType]``. for the list of arguments in the type hint: ``Callable[..., ReturnType]``.