python函数对象

from typing import Optional


class Item():
    name: str
    description: Optional[str] = None
    price: float
    tax: Optional[float] = None


def fun(name,age:Item,sex:str="1"):
    print(name,age,sex)


print(fun.__annotations__)
print(fun.__code__.co_varnames)

for key in fun.__code__.co_varnames:
    if fun.__annotations__.__contains__(key):
        print(key,fun.__annotations__.get(key))

输出

{'age': <class '__main__.Item'>, 'sex': <class 'str'>}
('name', 'age', 'sex')
age <class '__main__.Item'>
sex <class 'str'>

类型检查

from typing import Union
a = Union[str,None]
print(a.__args__)
print(type(None) in a.__args__)
print(str in a.__args__)
print(list in a.__args__)

输出

(<class 'str'>, <class 'NoneType'>)
True
True
False