fix schema request params error (#11)

Author: yufeiminds

ucloud/core/typesystem/schema.py

@@ -7,7 +7,7 @@
 
 
 class Schema(abstract.Schema):
-    fields = {}
+    fields = {}  # noqa: F811
 
     def dumps(self, d: dict, name=None, **kwargs) -> dict:
         result = {}
@@ -81,7 +81,7 @@ def loads(self, d: dict, name=None, **kwargs) -> dict:
 
 
 class RequestSchema(Schema):
-    fields = {}
+    fields = {}  # noqa: F811
 
     def dumps(self, d: dict, name=None, **kwargs) -> dict:
         if not isinstance(d, dict):