diff --git a/graphene/relay/tests/test_connection_query.py b/graphene/relay/tests/test_connection_query.py
index be6ee8c7..2e7a1531 100644
--- a/graphene/relay/tests/test_connection_query.py
+++ b/graphene/relay/tests/test_connection_query.py
@@ -54,10 +54,10 @@ for i, letter in enumerate(letter_chars):
 def edges(selected_letters):
     return [
         {
-            "node": {"id": base64("Letter:%s" % l.id), "letter": l.letter},
-            "cursor": base64("arrayconnection:%s" % l.id),
+            "node": {"id": base64("Letter:%s" % letter.id), "letter": letter.letter},
+            "cursor": base64("arrayconnection:%s" % letter.id),
         }
-        for l in [letters[i] for i in selected_letters]
+        for letter in [letters[i] for i in selected_letters]
     ]
 
 
diff --git a/graphene/types/mutation.py b/graphene/types/mutation.py
index c96162e4..31c32284 100644
--- a/graphene/types/mutation.py
+++ b/graphene/types/mutation.py
@@ -135,7 +135,7 @@ class Mutation(ObjectType):
     def Field(
         cls, name=None, description=None, deprecation_reason=None, required=False
     ):
-        """ Mount instance of mutation Field. """
+        """Mount instance of mutation Field."""
         return Field(
             cls._meta.output,
             args=cls._meta.arguments,
diff --git a/graphene/types/tests/test_query.py b/graphene/types/tests/test_query.py
index 8681e462..0885e22b 100644
--- a/graphene/types/tests/test_query.py
+++ b/graphene/types/tests/test_query.py
@@ -399,7 +399,7 @@ def test_big_list_of_containers_multiple_fields_query_benchmark(benchmark):
 
 
 def test_big_list_of_containers_multiple_fields_custom_resolvers_query_benchmark(
-    benchmark
+    benchmark,
 ):
     class Container(ObjectType):
         x = Int()
diff --git a/tests_asyncio/test_relay_connection.py b/tests_asyncio/test_relay_connection.py
index ec86fef6..edac6fc9 100644
--- a/tests_asyncio/test_relay_connection.py
+++ b/tests_asyncio/test_relay_connection.py
@@ -56,10 +56,10 @@ for i, letter in enumerate(letter_chars):
 def edges(selected_letters):
     return [
         {
-            "node": {"id": base64("Letter:%s" % l.id), "letter": l.letter},
-            "cursor": base64("arrayconnection:%s" % l.id),
+            "node": {"id": base64("Letter:%s" % letter.id), "letter": letter.letter},
+            "cursor": base64("arrayconnection:%s" % letter.id),
         }
-        for l in [letters[i] for i in selected_letters]
+        for letter in [letters[i] for i in selected_letters]
     ]