diff --git a/zulip_bots/zulip_bots/bots/baremetrics/test_baremetrics.py b/zulip_bots/zulip_bots/bots/baremetrics/test_baremetrics.py
index 0aad62b..15b231d 100644
--- a/zulip_bots/zulip_bots/bots/baremetrics/test_baremetrics.py
+++ b/zulip_bots/zulip_bots/bots/baremetrics/test_baremetrics.py
@@ -74,7 +74,7 @@ class TestBaremetricsBot(BotTestCase, DefaultTests):
             with self.mock_http_conversation('list_subscriptions'):
                 self.verify_reply('list-subscriptions TEST', r)
 
-    def test_exception_when_api_key_is_invalid(self)-> None:
+    def test_exception_when_api_key_is_invalid(self) -> None:
         bot_test_instance = BaremetricsHandler()
 
         with self.mock_config_info({'api_key': 'TEST'}):
diff --git a/zulip_bots/zulip_bots/bots/link_shortener/test_link_shortener.py b/zulip_bots/zulip_bots/bots/link_shortener/test_link_shortener.py
index e078fdb..ee00ab4 100644
--- a/zulip_bots/zulip_bots/bots/link_shortener/test_link_shortener.py
+++ b/zulip_bots/zulip_bots/bots/link_shortener/test_link_shortener.py
@@ -44,7 +44,7 @@ class TestLinkShortenerBot(BotTestCase, DefaultTests):
                        ('Mention the link shortener bot in a conversation and then '
                         'enter any URLs you want to shorten in the body of the message.'))
 
-    def test_exception_when_api_key_is_invalid(self)-> None:
+    def test_exception_when_api_key_is_invalid(self) -> None:
         bot_test_instance = LinkShortenerHandler()
         with self.mock_config_info({'key': 'qwertyuiopx'}):
             with self.mock_http_conversation('test_invalid_access_token'):
diff --git a/zulip_bots/zulip_bots/bots/merels/merels.py b/zulip_bots/zulip_bots/bots/merels/merels.py
index 9e723c8..941f481 100644
--- a/zulip_bots/zulip_bots/bots/merels/merels.py
+++ b/zulip_bots/zulip_bots/bots/merels/merels.py
@@ -32,7 +32,7 @@ class MerelsModel:
             return 'current turn'
         return ''
 
-    def contains_winning_move(self, board: Any) ->bool:
+    def contains_winning_move(self, board: Any) -> bool:
         merels = database.MerelsStorage(self.topic, self.storage)
         data = game_data.GameData(merels.get_game_data(self.topic))