@singledispatchmethod 无法正常工作

Question

@singledispatchmethod 工作不正常。我有这个代码

class Stream:
    @singledispatchmethod
    def subscribe(self, arg_1, arg_2):
        pass

    @subscribe.register
    def _(self, msg_type: type, action: Callable):
        pass

    @subscribe.register
    def _(self, msg_type: type, context: bool):
        pass


def aaa() -> None:
    pass


@pytest.mark.asyncio
async def test_can_subscribe_to_specific_event_types():
    stream = Stream()
    stream.subscribe(type(str), aaa)

我想调用一个需要

的方法的重载

def _(self, msg_type: type, action: Callable):

但 python 呼叫

def _(self, msg_type: type, context: bool):

我做错了什么？

Answer 1

From the docs

When defining a function using @singledispatchmethod, note that the dispatch happens on the type of the first non-self or non-cls argument

你的情况是msg_type。

@singledispatchmethod 无法正常工作

@singledispatchmethod is not working correctly

python

python-3.8