diff --git a/moto/secretsmanager/utils.py b/moto/secretsmanager/utils.py
index cc2d6ce8a..73275ee05 100644
--- a/moto/secretsmanager/utils.py
+++ b/moto/secretsmanager/utils.py
@@ -81,7 +81,7 @@ def get_secret_name_from_arn(secret_id):
         # split the arn by colon
         # then get the last value which is the name appended with a random string
         # then remove the random string
-        secret_id = '-'.join(secret_id.split(':')[-1].split('-')[:-1])
+        secret_id = "-".join(secret_id.split(":")[-1].split("-")[:-1])
     return secret_id
 
 
diff --git a/tests/test_secretsmanager/test_secretsmanager.py b/tests/test_secretsmanager/test_secretsmanager.py
index 4d880604d..3b8c74e81 100644
--- a/tests/test_secretsmanager/test_secretsmanager.py
+++ b/tests/test_secretsmanager/test_secretsmanager.py
@@ -378,11 +378,11 @@ def test_describe_secret_with_arn():
     conn = boto3.client("secretsmanager", region_name="us-west-2")
     results = conn.create_secret(Name="test-secret", SecretString="foosecret")
 
-    secret_description = conn.describe_secret(SecretId=results['ARN'])
+    secret_description = conn.describe_secret(SecretId=results["ARN"])
 
     assert secret_description  # Returned dict is not empty
     assert secret_description["Name"] == ("test-secret")
-    assert secret_description["ARN"] != results['ARN']
+    assert secret_description["ARN"] != results["ARN"]
 
 
 @mock_secretsmanager