在Python3中注释static方法的返回类型[复制](Annotating the return type of a staticmethod in Python3 [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 使用类作为其方法中的参数的类型提示 2答案 
 
 
 
 
 我开始使用更多Python3的打字支持，我希望能够注释作为替代构造函数的staticmethods的返回类型。 
 
 一个最小的例子如下; 如果我包含注释失败，则： 
 
def from_other_datastructure(json_data: str) -> MyThing:
    NameError: name 'MyThing' is not defined
 
import typing


class MyThing:
    def __init__(self, items: typing.List[int]):
        self.items = items

    @staticmethod
    def from_other_datastructure(json_data: str):
        return MyThing(
            [int(d) for d in json_data.split(',')]
        )

if __name__ == '__main__':
    s1 = MyThing([1, 2, 3])

    s2 = MyThing.from_other_datastructure("2,3,4")
 
 那么在为类型注释定义类之前如何引用类呢？ 

 
 
This question already has an answer here:
 
 
 
  
 Using the class as a type hint for arguments in its methods  2 answers  
 
 
 
 
I'm starting to use more of Python3's typing support and I'd like to be able to annotate the return type of staticmethods that are acting as alternative constructors. 
 
A minimal example follows; if I include the annotation it fails with:
 
def from_other_datastructure(json_data: str) -> MyThing:
    NameError: name 'MyThing' is not defined
 
import typing


class MyThing:
    def __init__(self, items: typing.List[int]):
        self.items = items

    @staticmethod
    def from_other_datastructure(json_data: str):
        return MyThing(
            [int(d) for d in json_data.split(',')]
        )

if __name__ == '__main__':
    s1 = MyThing([1, 2, 3])

    s2 = MyThing.from_other_datastructure("2,3,4")
 
So how does one reference a class before it has been defined for type annotations?

原文：https://stackoverflow.com/questions/40371082