diff --git a/tractor/_actor.py b/tractor/_actor.py
index bb13310..7368853 100644
--- a/tractor/_actor.py
+++ b/tractor/_actor.py
@@ -282,7 +282,8 @@ class Actor:
         # TODO: consider making this a dynamically defined
         # @dataclass once we get py3.7
         self.loglevel = loglevel
-        self._arb_addr = tuple(arbiter_addr) if arbiter_addr is not None else (None, None)
+        self._arb_addr = tuple(
+            arbiter_addr) if arbiter_addr is not None else (None, None)
 
         # marked by the process spawning backend at startup
         # will be None for the parent most process started manually
@@ -312,7 +313,8 @@ class Actor:
         self._parent_chan: Optional[Channel] = None
         self._forkserver_info: Optional[
             Tuple[Any, Any, Any, Any, Any]] = None
-        self._actoruid2nursery: Dict[str, 'ActorNursery'] = {}  # type: ignore  # noqa
+
+        self._actoruid2nursery: Dict[str, 'ActorNursery'] = {}  # type: ignore # noqa
 
     async def wait_for_peer(
         self, uid: Tuple[str, str]