pep8

synapse/storage/data_stores/main/event_federation.py

@@ -14,7 +14,7 @@
 # limitations under the License.
 import itertools
 import logging
-from typing import Dict, List, Optional, Set
+from typing import Dict, List, Optional, Set, Tuple
 
 from six.moves.queue import Empty, PriorityQueue
 
@@ -222,7 +222,9 @@ class EventFederationWorkerStore(EventsWorkerStore, SignatureWorkerStore, SQLBas
 
                     # Assume that this event is unreachable from any of the
                     # state sets until proven otherwise
-                    sets = event_to_missing_sets[auth_event_id] = set(range(len(state_sets)))
+                    sets = event_to_missing_sets[auth_event_id] = set(
+                        range(len(state_sets))
+                    )
                 else:
                     # We've previously seen this event, so look up its auth
                     # events and recursively mark all ancestors as reachable