3 files changed, 9 insertions, 4 deletions
diff --git a/synapse/api/filtering.py b/synapse/api/filtering.py
index 6eab1f13f0..8b64d0a285 100644
--- a/synapse/api/filtering.py
+++ b/synapse/api/filtering.py
@@ -15,6 +15,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from typing import List
+
 from six import text_type
 
 import jsonschema
@@ -293,7 +295,7 @@ class Filter(object):
             room_id = None
             ev_type = "m.presence"
             contains_url = False
-            labels = []
+            labels = []  # type: List[str]
         else:
             sender = event.get("sender", None)
             if not sender:
diff --git a/synapse/api/ratelimiting.py b/synapse/api/ratelimiting.py
index 172841f595..7a049b3af7 100644
--- a/synapse/api/ratelimiting.py
+++ b/synapse/api/ratelimiting.py
@@ -12,7 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import collections
+from collections import OrderedDict
+from typing import Any, Optional, Tuple
 
 from synapse.api.errors import LimitExceededError
 
@@ -23,7 +24,9 @@ class Ratelimiter(object):
     """
 
     def __init__(self):
-        self.message_counts = collections.OrderedDict()
+        self.message_counts = (
+            OrderedDict()
+        )  # type: OrderedDict[Any, Tuple[float, int, Optional[float]]]
 
     def can_do_action(self, key, time_now_s, rate_hz, burst_count, update=True):
         """Can the entity (e.g. user or IP address) perform the action?
diff --git a/synapse/event_auth.py b/synapse/event_auth.py
index 1033e5e121..e3a1ba47a0 100644
--- a/synapse/event_auth.py
+++ b/synapse/event_auth.py
@@ -634,7 +634,7 @@ def get_public_keys(invite_event):
     return public_keys
 
 
-def auth_types_for_event(event) -> Set[Tuple[str]]:
+def auth_types_for_event(event) -> Set[Tuple[str, str]]:
     """Given an event, return a list of (EventType, StateKey) that may be
     needed to auth the event. The returned list may be a superset of what
     would actually be required depending on the full state of the room.