diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index 540995e062..f2b2e30bf4 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -1163,7 +1163,7 @@ class E2eKeysHandler:
devices = devices[user_id]
except SynapseError as e:
failure = _exception_to_failure(e)
- failures[user_id] = {device: failure for device in signatures.keys()}
+ failures[user_id] = dict.fromkeys(signatures.keys(), failure)
return signature_list, failures
for device_id, device in signatures.items():
@@ -1303,7 +1303,7 @@ class E2eKeysHandler:
except SynapseError as e:
failure = _exception_to_failure(e)
for user, devicemap in signatures.items():
- failures[user] = {device_id: failure for device_id in devicemap.keys()}
+ failures[user] = dict.fromkeys(devicemap.keys(), failure)
return signature_list, failures
for target_user, devicemap in signatures.items():
@@ -1344,9 +1344,7 @@ class E2eKeysHandler:
# other devices were signed -- mark those as failures
logger.debug("upload signature: too many devices specified")
failure = _exception_to_failure(NotFoundError("Unknown device"))
- failures[target_user] = {
- device: failure for device in other_devices
- }
+ failures[target_user] = dict.fromkeys(other_devices, failure)
if user_signing_key_id in master_key.get("signatures", {}).get(
user_id, {}
@@ -1367,9 +1365,7 @@ class E2eKeysHandler:
except SynapseError as e:
failure = _exception_to_failure(e)
if device_id is None:
- failures[target_user] = {
- device_id: failure for device_id in devicemap.keys()
- }
+ failures[target_user] = dict.fromkeys(devicemap.keys(), failure)
else:
failures.setdefault(target_user, {})[device_id] = failure
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