def __init__(self, master_api_client: MasterApiClient, loop: AbstractEventLoop) -> None:
    self._master_api_client = master_api_client
    self._loop = loop
    self._callbacks: DefaultDict[(str, Set[Callback])] = defaultdict(set)
    self._cache: Dict[(str, Any)] = {}
def __init__(self, master_api_client: MasterApiClient, loop: AbstractEventLoop) -> None:
    self._master_api_client = master_api_client
    self._loop = loop
    self._callbacks: DefaultDict[(str, Set[Callback])] = defaultdict(set)
    self._cache: Dict[(str, Any)] = {}