Update demo2.py

demo2.py

@@ -124,7 +124,6 @@ class DemoDataset(datasets.GeneratorBasedBuilder):
 
     # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
     def _generate_examples(self, filepath):
-        key = 0
         with open(filepath, encoding="utf-8") as f:
             reader = csv.DictReader(f)
             for key, row in enumerate(reader):
@@ -132,5 +131,4 @@ class DemoDataset(datasets.GeneratorBasedBuilder):
                         "index": row["index"],
                         "text": row["text"],
                         "label": row["label"]
-                    }
-                    key += 1
+                    }