meta.py 文件源码

def __init__(cls, name, bases, methods):
        coros = {}
        for base in reversed(cls.__mro__):
            coros.update((name, val) for name, val in vars(base).items()
                         if inspect.iscoroutinefunction(val))

        for name, val in vars(cls).items():
            if name in coros and not inspect.iscoroutinefunction(val):
                raise TypeError('Must use async def %s%s' % (name, inspect.signature(val)))
        super().__init__(name, bases, methods)