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-rw-r--r--synapse/handlers/device.py6
-rw-r--r--synapse/handlers/identity.py8
-rw-r--r--synapse/handlers/message.py4
3 files changed, 10 insertions, 8 deletions
diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 40f3d24678..f7457a7082 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -155,7 +155,7 @@ class DeviceHandler(BaseHandler):
 
         try:
             yield self.store.delete_device(user_id, device_id)
-        except errors.StoreError, e:
+        except errors.StoreError as e:
             if e.code == 404:
                 # no match
                 pass
@@ -204,7 +204,7 @@ class DeviceHandler(BaseHandler):
 
         try:
             yield self.store.delete_devices(user_id, device_ids)
-        except errors.StoreError, e:
+        except errors.StoreError as e:
             if e.code == 404:
                 # no match
                 pass
@@ -243,7 +243,7 @@ class DeviceHandler(BaseHandler):
                 new_display_name=content.get("display_name")
             )
             yield self.notify_device_update(user_id, [device_id])
-        except errors.StoreError, e:
+        except errors.StoreError as e:
             if e.code == 404:
                 raise errors.NotFoundError()
             else:
diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index 9efcdff1d6..91a0898860 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -15,6 +15,11 @@
 # limitations under the License.
 
 """Utilities for interacting with Identity Servers"""
+
+import logging
+
+import simplejson as json
+
 from twisted.internet import defer
 
 from synapse.api.errors import (
@@ -24,9 +29,6 @@ from ._base import BaseHandler
 from synapse.util.async import run_on_reactor
 from synapse.api.errors import SynapseError, Codes
 
-import json
-import logging
-
 logger = logging.getLogger(__name__)
 
 
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index 5a8ddc253e..6de6e13b7b 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -27,7 +27,7 @@ from synapse.types import (
 from synapse.util.async import run_on_reactor, ReadWriteLock, Limiter
 from synapse.util.logcontext import preserve_fn, run_in_background
 from synapse.util.metrics import measure_func
-from synapse.util.frozenutils import unfreeze
+from synapse.util.frozenutils import frozendict_json_encoder
 from synapse.util.stringutils import random_string
 from synapse.visibility import filter_events_for_client
 from synapse.replication.http.send_event import send_event_to_master
@@ -678,7 +678,7 @@ class EventCreationHandler(object):
 
         # Ensure that we can round trip before trying to persist in db
         try:
-            dump = simplejson.dumps(unfreeze(event.content))
+            dump = frozendict_json_encoder.encode(event.content)
             simplejson.loads(dump)
         except Exception:
             logger.exception("Failed to encode content: %r", event.content)