当我尝试使用在另一个包中定义的装饰器时,mypy 失败并显示错误消息 Untyped decorator makes function "my_method" untyped
。我应该如何定义我的装饰器以确保它通过?
from mypackage import mydecorator
@mydecorator
def my_method(date: int) -> str:
...
答案 0 :(得分:1)
mypy
文档包含描述具有任意签名的函数的装饰器声明的 section。示例:
from typing import Any, Callable, TypeVar, Tuple, cast
F = TypeVar('F', bound=Callable[..., Any])
# A decorator that preserves the signature.
def my_decorator(func: F) -> F:
def wrapper(*args, **kwds):
print("Calling", func)
return func(*args, **kwds)
return cast(F, wrapper)
# A decorated function.
@my_decorator
def foo(a: int) -> str:
return str(a)
a = foo(12)
reveal_type(a) # str
foo('x') # Type check error: incompatible type "str"; expected "int"