diff --git a/fastapi/dependencies/models.py b/fastapi/dependencies/models.py
index 9bbd81d37..1f4192a51 100644
--- a/fastapi/dependencies/models.py
+++ b/fastapi/dependencies/models.py
@@ -33,9 +33,9 @@ class LifespanDependant:
         elif self.name is not None:
             self.cache_key = (self.caller, self.name)
         else:
-            assert (
-                self.index is not None
-            ), "Lifespan dependency must have an associated name or index."
+            assert self.index is not None, (
+                "Lifespan dependency must have an associated name or index."
+            )
             self.cache_key = (self.caller, self.index)
 
 
diff --git a/tests/test_tutorial/test_dependencies/test_tutorial013b.py b/tests/test_tutorial/test_dependencies/test_tutorial013b.py
index 4483a3a17..a7a092cf0 100644
--- a/tests/test_tutorial/test_dependencies/test_tutorial013b.py
+++ b/tests/test_tutorial/test_dependencies/test_tutorial013b.py
@@ -75,9 +75,9 @@ def test_dependency_usage(database_connection_mocks):
                 users_connection = connection
                 break
 
-        assert (
-            users_connection is not None
-        ), "No connection was found for users endpoint"
+        assert users_connection is not None, (
+            "No connection was found for users endpoint"
+        )
 
         response = test_client.get("/groups")
         assert response.status_code == 200
@@ -89,9 +89,9 @@ def test_dependency_usage(database_connection_mocks):
                 groups_connection = connection
                 break
 
-        assert (
-            groups_connection is not None
-        ), "No connection was found for groups endpoint"
+        assert groups_connection is not None, (
+            "No connection was found for groups endpoint"
+        )
         assert groups_connection.get_records_count == 1
 
         items_connection = None
@@ -100,9 +100,9 @@ def test_dependency_usage(database_connection_mocks):
                 items_connection = connection
                 break
 
-        assert (
-            items_connection is not None
-        ), "No connection was found for items endpoint"
+        assert items_connection is not None, (
+            "No connection was found for items endpoint"
+        )
 
         response = test_client.get("/items")
         assert response.status_code == 200
diff --git a/tests/test_tutorial/test_dependencies/test_tutorial013b_an_py39.py b/tests/test_tutorial/test_dependencies/test_tutorial013b_an_py39.py
index 6a489199f..e782f729f 100644
--- a/tests/test_tutorial/test_dependencies/test_tutorial013b_an_py39.py
+++ b/tests/test_tutorial/test_dependencies/test_tutorial013b_an_py39.py
@@ -80,9 +80,9 @@ def test_dependency_usage(database_connection_mocks):
                 users_connection = connection
                 break
 
-        assert (
-            users_connection is not None
-        ), "No connection was found for users endpoint"
+        assert users_connection is not None, (
+            "No connection was found for users endpoint"
+        )
 
         response = test_client.get("/groups")
         assert response.status_code == 200
@@ -94,9 +94,9 @@ def test_dependency_usage(database_connection_mocks):
                 groups_connection = connection
                 break
 
-        assert (
-            groups_connection is not None
-        ), "No connection was found for groups endpoint"
+        assert groups_connection is not None, (
+            "No connection was found for groups endpoint"
+        )
         assert groups_connection.get_records_count == 1
 
         items_connection = None
@@ -105,9 +105,9 @@ def test_dependency_usage(database_connection_mocks):
                 items_connection = connection
                 break
 
-        assert (
-            items_connection is not None
-        ), "No connection was found for items endpoint"
+        assert items_connection is not None, (
+            "No connection was found for items endpoint"
+        )
 
         response = test_client.get("/items")
         assert response.status_code == 200