diff --git a/zulip/integrations/bridge_with_matrix/matrix_bridge.py b/zulip/integrations/bridge_with_matrix/matrix_bridge.py
index 3f950e86e..c6a191310 100644
--- a/zulip/integrations/bridge_with_matrix/matrix_bridge.py
+++ b/zulip/integrations/bridge_with_matrix/matrix_bridge.py
@@ -91,7 +91,7 @@ async def create(
         return matrix_to_zulip
 
     async def _matrix_to_zulip(self, room: nio.MatrixRoom, event: nio.Event) -> None:
-        logging.debug(f"_matrix_to_zulip; room {str(room.room_id)}, event: {str(event)}")
+        logging.debug(f"_matrix_to_zulip; room {room.room_id}, event: {event}")
 
         # We do this to identify the messages generated from Zulip -> Matrix
         # and we make sure we don't forward it again to the Zulip stream.
@@ -253,7 +253,7 @@ def _matrix_send(self, **kwargs: Any) -> None:
             raise Bridge_FatalMatrixException(str(result))
 
     def _zulip_to_matrix(self, msg: Dict[str, Any]) -> None:
-        logging.debug(f"_zulip_to_matrix; msg: {str(msg)}")
+        logging.debug(f"_zulip_to_matrix; msg: {msg}")
 
         room_id: Optional[str] = self.get_matrix_room_for_zulip_message(msg)
         if room_id is None:
@@ -485,7 +485,7 @@ def read_configuration(config_file: str) -> Dict[str, Dict[str, Any]]:
         if section.startswith("additional_bridge"):
             if section_keys != bridge_key_set:
                 raise Bridge_ConfigException(
-                    f"Please ensure the bridge configuration section {section} contain the following keys: {str(bridge_key_set)}."
+                    f"Please ensure the bridge configuration section {section} contain the following keys: {bridge_key_set}."
                 )
 
             zulip_target = (section_config["stream"], section_config["topic"])
diff --git a/zulip/integrations/codebase/zulip_codebase_mirror b/zulip/integrations/codebase/zulip_codebase_mirror
index ead29da10..c2bd4e58b 100755
--- a/zulip/integrations/codebase/zulip_codebase_mirror
+++ b/zulip/integrations/codebase/zulip_codebase_mirror
@@ -282,7 +282,7 @@ def run_mirror() -> None:
         else:
             since = datetime.fromtimestamp(float(timestamp), tz=pytz.utc)
     except (ValueError, OSError) as e:
-        logging.warn(f"Could not open resume file: {str(e)}")
+        logging.warn(f"Could not open resume file: {e}")
         since = default_since()
 
     try:
diff --git a/zulip/integrations/zephyr/zephyr_mirror_backend.py b/zulip/integrations/zephyr/zephyr_mirror_backend.py
index a0f09ddea..7c244e85a 100755
--- a/zulip/integrations/zephyr/zephyr_mirror_backend.py
+++ b/zulip/integrations/zephyr/zephyr_mirror_backend.py
@@ -160,7 +160,7 @@ def send_zulip(zulip_client: zulip.Client, zeph: ZephyrDict) -> Dict[str, Any]:
     message["content"] = unwrap_lines(zeph["content"])
 
     if options.test_mode and options.site == DEFAULT_SITE:
-        logger.debug(f"Message is: {str(message)}")
+        logger.debug(f"Message is: {message}")
         return {"result": "success"}
 
     return zulip_client.send_message(message)
diff --git a/zulip_bots/zulip_bots/bots/dialogflow/dialogflow.py b/zulip_bots/zulip_bots/bots/dialogflow/dialogflow.py
index 592180ba0..16ea544d6 100644
--- a/zulip_bots/zulip_bots/bots/dialogflow/dialogflow.py
+++ b/zulip_bots/zulip_bots/bots/dialogflow/dialogflow.py
@@ -36,7 +36,7 @@ def get_bot_result(message_content: str, config: Dict[str, str], sender_id: str)
         return res_json["result"]["fulfillment"]["speech"]
     except Exception as e:
         logging.exception(str(e))
-        return f"Error. {str(e)}."
+        return f"Error. {e}."
 
 
 class DialogFlowHandler:
diff --git a/zulip_bots/zulip_bots/lib.py b/zulip_bots/zulip_bots/lib.py
index 90ad0e2af..895ba6691 100644
--- a/zulip_bots/zulip_bots/lib.py
+++ b/zulip_bots/zulip_bots/lib.py
@@ -145,7 +145,7 @@ def put(self, key: str, value: Any) -> None:
         self.state_[key] = self.marshal(value)
         response = self._client.update_storage({"storage": {key: self.state_[key]}})
         if response["result"] != "success":
-            raise StateHandlerError(f"Error updating state: {str(response)}")
+            raise StateHandlerError(f"Error updating state: {response}")
 
     def get(self, key: str) -> Any:
         if key in self.state_: