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login/models.py

@@ -46,9 +46,7 @@ class User(db.Model):
         }
 
         # Relabel field names
-        for field in mapping:
-            old_field_name = field[0]
-            new_field_name = field[1]
+        for old_field_name, new_field_name in mapping:
             token[new_field_name] = token[old_field_name]
             del token[old_field_name]