Method configure

tornado/ioloop.py:172–181

(
        cls, impl: "Union[None, str, Type[Configurable]]", **kwargs: Any
    )

    @classmethod
    def configure(
        cls, impl: "Union[None, str, Type[Configurable]]", **kwargs: Any
    ) -> None:
        from tornado.platform.asyncio import BaseAsyncIOLoop

        if isinstance(impl, str):
            impl = import_object(impl)
        if isinstance(impl, type) and not issubclass(impl, BaseAsyncIOLoop):
            raise RuntimeError("only AsyncIOLoop is allowed when asyncio is available")
        super().configure(impl, **kwargs)

    @staticmethod
    def instance() -> "IOLoop":