initial reader - bug fix

b2w-reviews01.py

@@ -74,11 +74,10 @@ class Reviews(datasets.GeneratorBasedBuilder):
 
     def _generate_examples(self, filepath):
         def process_row(row):
-            for key, value in row.items():
-                if value == "nan":
-                    row[key] = None
-            if row["reviewer_birth_year"] is not None:
+            try:
                 row["reviewer_birth_year"] = int(float(row["reviewer_birth_year"]))
+            except ValueError:
+                row["reviewer_birth_year"] = None
             return row
         records = pd.read_csv(filepath).to_dict("records")
         for idx, row in enumerate(records):