Update app.py

app.py

@@ -48,13 +48,21 @@ def remove_invalid_unicode(input_string):
         return input_string  # Return non-string values as is
 
 def display(x, y):
-    # Assuming df is your DataFrame
-    for column in leaderboard_table.columns:
-        if leaderboard_table[column].dtype == 'object':
-            leaderboard_table[column] = leaderboard_table[column].apply(remove_invalid_unicode)
+    global leaderboard_table  # Ensure we're accessing the global variable
 
-    subset_df = leaderboard_df[COLS]
-    return subset_df
+    # Check if leaderboard_table is indeed a DataFrame
+    if isinstance(leaderboard_table, pd.DataFrame):
+        for column in leaderboard_table.columns:
+            if leaderboard_table[column].dtype == 'object':
+                leaderboard_table[column] = leaderboard_table[column].apply(remove_invalid_unicode)
+
+        # Ensure COLS is defined and valid; it's used to filter columns in the DataFrame
+        subset_df = leaderboard_table[COLS]  # Assuming COLS is a list of column names you want to keep
+        return subset_df
+    else:
+        # Handle the case where leaderboard_table is not a DataFrame
+        # This could include logging an error or initializing leaderboard_table as a DataFrame
+        print("leaderboard_table is not a DataFrame.")
 
 dummy1 = gr.Textbox(visible=False)
 
@@ -104,7 +112,6 @@ interface = gr.Interface(
 
 scheduler = BackgroundScheduler()
 scheduler.add_job(restart_space, "interval", seconds=1800)
-
 scheduler.start()
 
 interface.launch()