diff --git a/shierfeng-fastapi-backend/module_business/service/usage_service.py b/shierfeng-fastapi-backend/module_business/service/usage_service.py
index efb6014..c4d5340 100644
--- a/shierfeng-fastapi-backend/module_business/service/usage_service.py
+++ b/shierfeng-fastapi-backend/module_business/service/usage_service.py
@@ -130,9 +130,7 @@ class UsageService:
     @staticmethod
     def _success(usage: BizUsageRecord) -> CrudResponseModel:
         remaining_packages = usage.remaining_packages_after
-        flow_state = (
-            PalletFlowState.AT_SITE_EMPTY if remaining_packages == 0 else PalletFlowState.AT_SITE_PARTIAL
-        )
+        flow_state = PalletFlowState.AT_SITE_EMPTY if remaining_packages == 0 else PalletFlowState.AT_SITE_PARTIAL
         return CrudResponseModel(
             is_success=True,
             message='使用成功',
diff --git a/shierfeng-fastapi-backend/tests/module_business/test_usage_service.py b/shierfeng-fastapi-backend/tests/module_business/test_usage_service.py
index 31d567f..a08c42d 100644
--- a/shierfeng-fastapi-backend/tests/module_business/test_usage_service.py
+++ b/shierfeng-fastapi-backend/tests/module_business/test_usage_service.py
@@ -581,9 +581,7 @@ class TestUsageControllerContract(unittest.TestCase):
         response_schema = schema['components']['schemas'][post_response_schema['$ref'].rsplit('/', 1)[-1]]
         self.assertIn('data', response_schema['properties'])
         self.assertIn('data', response_schema['required'])
-        data_schema = schema['components']['schemas'][
-            response_schema['properties']['data']['$ref'].rsplit('/', 1)[-1]
-        ]
+        data_schema = schema['components']['schemas'][response_schema['properties']['data']['$ref'].rsplit('/', 1)[-1]]
         self.assertEqual(
             {'usageId', 'remainingPackages', 'flowState'},
             set(data_schema['properties']),
@@ -1472,9 +1470,7 @@ class TestUsageIdempotency(unittest.IsolatedAsyncioTestCase):
                     ),
                 )
                 expected_state = (
-                    PalletFlowState.AT_SITE_EMPTY
-                    if remaining_after == 0
-                    else PalletFlowState.AT_SITE_PARTIAL
+                    PalletFlowState.AT_SITE_EMPTY if remaining_after == 0 else PalletFlowState.AT_SITE_PARTIAL
                 )
                 self.assertIsInstance(result.result, UsageSuccessResponseModel)
                 self.assertEqual(