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Fixed bug in decorator annotation documentation.

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Eric Traut 2020-10-14 20:14:08 -07:00
parent c6e80ccd40
commit 246ff993e7
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docs/typed-libraries.md
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@ -224,12 +224,12 @@ def create_user(age: int, *, dob: Optional[date] = None):
```
### Annotating Decorators
Decorators modify the behavior of a class or a function. Annotating decorators that leave the signature of the decorated function unchanged is straightforward with the help of generics.
Decorators modify the behavior of a class or a function. Providing annotations for decorators is straightforward if the decorator retrains the original signature of the decorated function.
```python
_TCallable = TypeVar("_TCallable", bound=Callable[..., Any])
_F = TypeVar("_F", bound=Callable[..., Any])
def simple_decorator(_func: _TCallable) -> TCallable:
def simple_decorator(_func: _F) -> _F:
"""
Simple decorators are invoked without parens like this:
@simple_decorator
@ -237,7 +237,7 @@ def simple_decorator(_func: _TCallable) -> TCallable:
"""
...
def complex_decorator(*, mode: str) -> Callable[[_TCallable], _TCallable]:
def complex_decorator(*, mode: str) -> Callable[[_F], _F]:
"""
Complex decorators are invoked with arguments like this:
@complex_decorator(mode="easy")