diff --git a/moto/batch/models.py b/moto/batch/models.py
index 1a28fdcc5..ab52db54c 100644
--- a/moto/batch/models.py
+++ b/moto/batch/models.py
@@ -302,9 +302,7 @@ class Job(threading.Thread, BaseModel):
         self.job_id = str(uuid.uuid4())
         self.job_definition = job_def
         self.job_queue = job_queue
-        self.job_state = (
-            "SUBMITTED"
-        )  # One of SUBMITTED | PENDING | RUNNABLE | STARTING | RUNNING | SUCCEEDED | FAILED
+        self.job_state = "SUBMITTED"  # One of SUBMITTED | PENDING | RUNNABLE | STARTING | RUNNING | SUCCEEDED | FAILED
         self.job_queue.jobs.append(self)
         self.job_started_at = datetime.datetime(1970, 1, 1)
         self.job_stopped_at = datetime.datetime(1970, 1, 1)
diff --git a/moto/cloudformation/responses.py b/moto/cloudformation/responses.py
index fe875fed5..f5e094c15 100644
--- a/moto/cloudformation/responses.py
+++ b/moto/cloudformation/responses.py
@@ -177,9 +177,7 @@ class CloudFormationResponse(BaseResponse):
             start = stack_ids.index(token) + 1
         else:
             start = 0
-        max_results = (
-            50
-        )  # using this to mske testing of paginated stacks more convenient than default 1 MB
+        max_results = 50  # using this to mske testing of paginated stacks more convenient than default 1 MB
         stacks_resp = stacks[start : start + max_results]
         next_token = None
         if len(stacks) > (start + max_results):
diff --git a/moto/iam/models.py b/moto/iam/models.py
index a73ee709c..c67d5b365 100644
--- a/moto/iam/models.py
+++ b/moto/iam/models.py
@@ -788,9 +788,7 @@ class AccountSummary(BaseModel):
         self._groups_per_user_quota = 10
         self._attached_policies_per_user_quota = 10
         self._policies_quota = 1500
-        self._account_mfa_enabled = (
-            0
-        )  # Haven't found any information being able to activate MFA for the root account programmatically
+        self._account_mfa_enabled = 0  # Haven't found any information being able to activate MFA for the root account programmatically
         self._access_keys_per_user_quota = 2
         self._assume_role_policy_size_quota = 2048
         self._policy_versions_in_use_quota = 10000
diff --git a/moto/iam/policy_validation.py b/moto/iam/policy_validation.py
index c1a16cc5d..95610ac4d 100644
--- a/moto/iam/policy_validation.py
+++ b/moto/iam/policy_validation.py
@@ -88,9 +88,7 @@ class IAMPolicyDocumentValidator:
         self._policy_document = policy_document
         self._policy_json = {}
         self._statements = []
-        self._resource_error = (
-            ""
-        )  # the first resource error found that does not generate a legacy parsing error
+        self._resource_error = ""  # the first resource error found that does not generate a legacy parsing error
 
     def validate(self):
         try:
diff --git a/tests/test_ecs/test_ecs_boto3.py b/tests/test_ecs/test_ecs_boto3.py
index 38095bdc5..224e6935b 100644
--- a/tests/test_ecs/test_ecs_boto3.py
+++ b/tests/test_ecs/test_ecs_boto3.py
@@ -1924,9 +1924,7 @@ def test_attributes():
     )
     attrs = resp["attributes"]
 
-    NUM_CUSTOM_ATTRIBUTES = (
-        4
-    )  # 2 specific to individual machines and 1 global, going to both machines (2 + 1*2)
+    NUM_CUSTOM_ATTRIBUTES = 4  # 2 specific to individual machines and 1 global, going to both machines (2 + 1*2)
     NUM_DEFAULT_ATTRIBUTES = 4
     len(attrs).should.equal(
         NUM_CUSTOM_ATTRIBUTES + (NUM_DEFAULT_ATTRIBUTES * len(instances))