Update app.py

app.py

@@ -20,7 +20,7 @@ def label_data(ranges):
     global global_data
     for start, end, label in ranges.values:
         global_data.loc[start:end, 'label'] = label
-    return global_data.tail()
+    return pd.concat([global_data.head(), global_data.tail()])
 
 
 #def label_data(ranges):