diff --git a/zulip/integrations/bridge_with_matrix/matrix_bridge.py b/zulip/integrations/bridge_with_matrix/matrix_bridge.py
index 4ddee2d..6897dd5 100644
--- a/zulip/integrations/bridge_with_matrix/matrix_bridge.py
+++ b/zulip/integrations/bridge_with_matrix/matrix_bridge.py
@@ -43,7 +43,7 @@ def matrix_login(matrix_client: Any, matrix_config: Dict[str, Any]) -> None:
             raise Bridge_FatalMatrixException("Bad username or password.")
         else:
             raise Bridge_FatalMatrixException("Check if your server details are correct.")
-    except MissingSchema as exception:
+    except MissingSchema:
         raise Bridge_FatalMatrixException("Bad URL format.")
 
 def matrix_join_room(matrix_client: Any, matrix_config: Dict[str, Any]) -> Any:
@@ -304,7 +304,7 @@ def main() -> None:
             sys.exit("Zulip bridge error: {}".format(exception))
         except zulip.ZulipError as exception:
             sys.exit("Zulip error: {}".format(exception))
-        except Exception as e:
+        except Exception:
             traceback.print_exc()
         backoff.fail()
 
diff --git a/zulip/integrations/jabber/jabber_mirror_backend.py b/zulip/integrations/jabber/jabber_mirror_backend.py
index 88bc988..8fa56f8 100755
--- a/zulip/integrations/jabber/jabber_mirror_backend.py
+++ b/zulip/integrations/jabber/jabber_mirror_backend.py
@@ -451,7 +451,7 @@ option does not affect login credentials.'''.replace("\n", " "))
         logging.info("Connecting to Zulip.")
         zulipToJabber.client.call_on_each_event(zulipToJabber.process_event,
                                                 event_types=event_types)
-    except BaseException as e:
+    except BaseException:
         logging.exception("Exception in main loop")
         xmpp.abort()
         sys.exit(1)
diff --git a/zulip/integrations/log2zulip/log2zulip b/zulip/integrations/log2zulip/log2zulip
index 0c2e8c2..318430f 100755
--- a/zulip/integrations/log2zulip/log2zulip
+++ b/zulip/integrations/log2zulip/log2zulip
@@ -121,5 +121,5 @@ if __name__ == "__main__":
     finally:
         try:
             os.remove(lock_path)
-        except OSError as IOError:
+        except OSError:
             pass
diff --git a/zulip_bots/zulip_bots/bots/beeminder/test_beeminder.py b/zulip_bots/zulip_bots/bots/beeminder/test_beeminder.py
index aedc53b..c2ac3cd 100644
--- a/zulip_bots/zulip_bots/bots/beeminder/test_beeminder.py
+++ b/zulip_bots/zulip_bots/bots/beeminder/test_beeminder.py
@@ -67,8 +67,8 @@ at syntax by: @mention-botname help"
 right now.\nPlease try again later')
 
     def test_invalid_when_handle_message(self) -> None:
-        bot = get_bot_message_handler(self.bot_name)
-        bot_handler = StubBotHandler()
+        get_bot_message_handler(self.bot_name)
+        StubBotHandler()
 
         with self.mock_config_info({'auth_token': 'someInvalidKey',
                                     'username': 'aaron',
diff --git a/zulip_bots/zulip_bots/bots/define/define.py b/zulip_bots/zulip_bots/bots/define/define.py
index d3e9f27..3b0c534 100644
--- a/zulip_bots/zulip_bots/bots/define/define.py
+++ b/zulip_bots/zulip_bots/bots/define/define.py
@@ -65,7 +65,7 @@ class DefineHandler:
                         example = d['example'] if d['example'] else '*No example available.*'
                         response += '\n' + '* (**{}**) {}\n  {}'.format(d['type'], d['definition'], html2text.html2text(example))
 
-            except Exception as e:
+            except Exception:
                 response += self.REQUEST_ERROR_MESSAGE
                 logging.exception("")
 
diff --git a/zulip_bots/zulip_bots/bots/dialogflow/test_dialogflow.py b/zulip_bots/zulip_bots/bots/dialogflow/test_dialogflow.py
index 560a4b0..c27e44b 100644
--- a/zulip_bots/zulip_bots/bots/dialogflow/test_dialogflow.py
+++ b/zulip_bots/zulip_bots/bots/dialogflow/test_dialogflow.py
@@ -28,7 +28,7 @@ class MockTextRequest():
 def mock_dialogflow(test_name: str, bot_name: str) -> Iterator[None]:
     response_data = read_bot_fixture_data(bot_name, test_name)
     try:
-        df_request = response_data['request']
+        response_data['request']
         df_response = response_data['response']
     except KeyError:
         print("ERROR: 'request' or 'response' field not found in fixture.")
diff --git a/zulip_bots/zulip_bots/bots/giphy/test_giphy.py b/zulip_bots/zulip_bots/bots/giphy/test_giphy.py
index 8bf6eb4..3349150 100755
--- a/zulip_bots/zulip_bots/bots/giphy/test_giphy.py
+++ b/zulip_bots/zulip_bots/bots/giphy/test_giphy.py
@@ -33,8 +33,8 @@ class TestGiphyBot(BotTestCase, DefaultTests):
             )
 
     def test_invalid_config(self) -> None:
-        bot = get_bot_message_handler(self.bot_name)
-        bot_handler = StubBotHandler()
+        get_bot_message_handler(self.bot_name)
+        StubBotHandler()
         with self.mock_http_conversation('test_403'):
             self.validate_invalid_config({'key': '12345678'},
                                          "This is likely due to an invalid key.\n")
@@ -45,8 +45,8 @@ class TestGiphyBot(BotTestCase, DefaultTests):
             self.validate_invalid_config({'key': '12345678'}, str(error))
 
     def test_valid_config(self) -> None:
-        bot = get_bot_message_handler(self.bot_name)
-        bot_handler = StubBotHandler()
+        get_bot_message_handler(self.bot_name)
+        StubBotHandler()
         with self.mock_http_conversation('test_normal'):
             self.validate_valid_config({'key': '12345678'})
 
diff --git a/zulip_bots/zulip_bots/bots/merels/libraries/game.py b/zulip_bots/zulip_bots/bots/merels/libraries/game.py
index 3190f91..61f1fd4 100644
--- a/zulip_bots/zulip_bots/bots/merels/libraries/game.py
+++ b/zulip_bots/zulip_bots/bots/merels/libraries/game.py
@@ -54,7 +54,7 @@ def beat(message, topic_name, merels_storage):
              we want to keep the turn of the same played,
              an empty string otherwise.
     """
-    merels = database.MerelsStorage(topic_name, merels_storage)
+    database.MerelsStorage(topic_name, merels_storage)
     match = COMMAND_PATTERN.match(message)
     same_player_move = ""  # message indicating move of the same player
 
diff --git a/zulip_bots/zulip_bots/bots/youtube/test_youtube.py b/zulip_bots/zulip_bots/bots/youtube/test_youtube.py
index d527fc2..14d701c 100644
--- a/zulip_bots/zulip_bots/bots/youtube/test_youtube.py
+++ b/zulip_bots/zulip_bots/bots/youtube/test_youtube.py
@@ -53,8 +53,8 @@ class TestYoutubeBot(BotTestCase, DefaultTests):
                     bot.initialize(bot_handler)
 
     def test_multiple(self) -> None:
-        bot = get_bot_message_handler(self.bot_name)
-        bot_handler = StubBotHandler()
+        get_bot_message_handler(self.bot_name)
+        StubBotHandler()
 
         bot_response = 'Here is what I found for `marvel` : ' \
                        '\n * Marvel Studios\' Avengers: Infinity War Official Trailer - [Watch now](https://www.youtube.com/watch/6ZfuNTqbHE8)' \
diff --git a/zulip_bots/zulip_bots/game_handler.py b/zulip_bots/zulip_bots/game_handler.py
index 5d6b049..4e89d0d 100644
--- a/zulip_bots/zulip_bots/game_handler.py
+++ b/zulip_bots/zulip_bots/game_handler.py
@@ -637,7 +637,7 @@ To move subjects, send your message again, otherwise join the game using the lin
     def get_user_cache(self) -> Dict[str, Any]:
         try:
             user_cache_str = self.bot_handler.storage.get('users')
-        except KeyError as e:
+        except KeyError:
             return {}
         self.user_cache = json.loads(user_cache_str)
         return self.user_cache
@@ -850,7 +850,7 @@ class GameInstance:
 
     def make_move(self, content: str, is_computer: bool) -> None:
         try:
-            board = self.model.make_move(content, self.turn, is_computer)
+            self.model.make_move(content, self.turn, is_computer)
         # Keep the turn of the same player
         except SamePlayerMove as smp:
             self.same_player_turn(content, smp.message, is_computer)
diff --git a/zulip_bots/zulip_bots/run.py b/zulip_bots/zulip_bots/run.py
index ed4b721..0002bce 100755
--- a/zulip_bots/zulip_bots/run.py
+++ b/zulip_bots/zulip_bots/run.py
@@ -111,7 +111,7 @@ def main() -> None:
 
         try:
             lib_module = finder.import_module_from_source(bot_path, bot_name)
-        except ImportError as e:
+        except ImportError:
             req_path = os.path.join(os.path.dirname(bot_path), "requirements.txt")
             with open(req_path) as fp:
                 deps_list = fp.read()
diff --git a/zulip_bots/zulip_bots/tests/test_lib.py b/zulip_bots/zulip_bots/tests/test_lib.py
index dbf882e..2c93903 100644
--- a/zulip_bots/zulip_bots/tests/test_lib.py
+++ b/zulip_bots/zulip_bots/tests/test_lib.py
@@ -132,7 +132,7 @@ class LibTest(TestCase):
 
     def test_content_and_full_content(self):
         client = FakeClient()
-        profile = client.get_profile()
+        client.get_profile()
         handler = ExternalBotHandler(
             client=client,
             root_dir=None,
diff --git a/zulip_botserver/zulip_botserver/server.py b/zulip_botserver/zulip_botserver/server.py
index 33e2667..ce7aa4d 100644
--- a/zulip_botserver/zulip_botserver/server.py
+++ b/zulip_botserver/zulip_botserver/server.py
@@ -155,7 +155,7 @@ def handle_bot() -> str:
         raise Unauthorized("Request token does not match token found for bot {} in the "
                            "Botserver configuration file. Do the outgoing webhooks in "
                            "Zulip point to the right Botserver?".format(event['bot_email']))
-    lib_module = app.config.get("BOTS_LIB_MODULES", {})[bot]
+    app.config.get("BOTS_LIB_MODULES", {})[bot]
     bot_handler = app.config.get("BOT_HANDLERS", {})[bot]
     message_handler = app.config.get("MESSAGE_HANDLERS", {})[bot]
     is_mentioned = event['trigger'] == "mention"