1 files changed, 31 insertions, 13 deletions
diff --git a/synapse/rest/client/keys.py b/synapse/rest/client/keys.py
index 5ba4fabbbc..8379092ac0 100644
--- a/synapse/rest/client/keys.py
+++ b/synapse/rest/client/keys.py
@@ -15,10 +15,20 @@
 # limitations under the License.
 
 import logging
-from typing import TYPE_CHECKING, Any, Optional, Tuple, Union, Dict, Sequence, TypeVar, Type
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Dict,
+    Optional,
+    Sequence,
+    Tuple,
+    Type,
+    TypeVar,
+    Union,
+)
 
 import attr
-from attr.validators import instance_of, deep_iterable, deep_mapping, optional
+from attr.validators import deep_iterable, deep_mapping, instance_of, optional
 
 from synapse.api.errors import InvalidAPICallError, SynapseError
 from synapse.http.server import HttpServer
@@ -50,11 +60,13 @@ def check_str_or_jsondict(instance: Any, attribute: str, input: Any) -> None:
     if isinstance(input, str):
         pass
     elif isinstance(input, dict):
-        for key, val in input.items():
+        for key in input:
             if not isinstance(key, str):
                 raise TypeError(f"{attribute} dictionary has non-string key {key}")
     else:
-        raise TypeError(f"{attribute} should be a string, or a map from strings to any type.")
+        raise TypeError(
+            f"{attribute} should be a string, or a map from strings to any type."
+        )
 
 
 @attr.s(frozen=True, slots=True)
@@ -62,19 +74,23 @@ class DeviceKeys:
     user_id: str = attr.ib(validator=instance_of(str))
     device_id: str = attr.ib(validator=instance_of(str))
     algorithms: Sequence[str] = attr.ib(validator=deep_iterable(instance_of(str)))
-    keys: Dict[str, str] = attr.ib(validator=deep_mapping(instance_of(str), instance_of(str)))
-    signatures: Signatures = attr.ib(validator=deep_mapping(
-        instance_of(str), deep_mapping(instance_of(str), instance_of(str))
-    ))
+    keys: Dict[str, str] = attr.ib(
+        validator=deep_mapping(instance_of(str), instance_of(str))
+    )
+    signatures: Signatures = attr.ib(
+        validator=deep_mapping(
+            instance_of(str), deep_mapping(instance_of(str), instance_of(str))
+        )
+    )
 
 
 @attr.s(frozen=True, slots=True, auto_attribs=True)
 class KeyUploadBody:
-    device_keys: Optional[DeviceKeys] = attr.ib(converter=attr.converters.optional(DeviceKeys))
+    device_keys: Optional[DeviceKeys] = attr.ib(
+        converter=attr.converters.optional(DeviceKeys)
+    )
     one_time_keys: Optional[Dict[str, Union[str, JsonDict]]] = attr.ib(
-        validator=optional(deep_mapping(
-            instance_of(str), check_str_or_jsondict
-        ))
+        validator=optional(deep_mapping(instance_of(str), check_str_or_jsondict))
     )
     org_matrix_msc2732_fallback_keys: Optional[Dict[str, Union[str, JsonDict]]]
 
@@ -83,7 +99,9 @@ class KeyUploadBody:
         return cls(
             device_keys=src.get("device_keys"),
             one_time_keys=src.get("one_time_keys"),
-            org_matrix_msc2732_fallback_keys=src.get("org.matrix.msc2732.fallback.keys"),
+            org_matrix_msc2732_fallback_keys=src.get(
+                "org.matrix.msc2732.fallback.keys"
+            ),
         )