Python decorator to inject values into a an azure function trigger entry point

main.py

def service_bus_client(_fnc=None, conn_str: str = "", topic_name: str = ""):
    def decorate(decorated_func: Callable):

        topic_client = AsyncServiceBusTopicClient.from_connection_string(
            conn_str=conn_str,
            topic_name=topic_name,
        )

        @wraps(decorated_func)
        async def wrapper(*args, **kwargs):
            return await decorated_func(topic_client=topic_client, *args, **kwargs)

        sig = inspect.signature(wrapper)
        new_parameters = dict(filter(lambda item: not item[1].annotation.endswith(AsyncServiceBusTopicClient.__name__), sig.parameters.items()))
        sig = sig.replace(parameters=list(new_parameters.values()))

        wrapper.__signature__ = sig

        return wrapper

    if _fnc is None:
        return decorate

    return decorate(_fnc)