Update app.py

app.py

@@ -276,16 +276,31 @@ def server(input, output, session):
             fig.subplots_adjust(left=0.01, right=0.99, top=0.99, bottom=0.01)
 
 
+    # # Download handler for CSV
+    # @session.download(filename="data.csv")
+    # def download_data():
+    #     # Create a string buffer
+    #     buffer = StringIO()
+    #     # Write the DataFrame to the buffer
+    #     cached_data().write_csv(buffer)
+    #     buffer.seek(0)
+    #     # Get the string value and return it
+    #     return buffer.getvalue()
+
+    # Reactive expression for the dataset
+    @reactive.calc
+    def dataset():
+        np.random.seed(123)
+        return pd.DataFrame({
+            'x': np.random.normal(0, 1, input.num_points()),
+            'y': np.random.normal(0, 1, input.num_points())
+        })
+
     # Download handler for CSV
     @session.download(filename="data.csv")
     def download_data():
-        # Create a string buffer
-        buffer = StringIO()
-        # Write the DataFrame to the buffer
-        cached_data().write_csv(buffer)
-        buffer.seek(0)
-        # Get the string value and return it
-        return buffer.getvalue()
+        # Get the current dataset and save it to CSV
+        return dataset().to_csv(index=False)