Update app.py

app.py

@@ -21,23 +21,33 @@ uploaded_file = st.file_uploader("Upload an Excel file", type=["xlsx"])
 
 
 import base64
+from io import BytesIO
 
 def get_binary_file_downloader_link(file_data, file_name, link_text):
     """
     Generates a link to download a file.
-    
+
     Parameters:
     - file_data: The data you want to make available for download.
     - file_name: The name of the file when downloaded.
     - link_text: The text to display for the download link.
-    
+
     Returns:
     - A Streamlit markdown link for downloading the file.
     """
-    b64 = base64.b64encode(file_data.to_excel(index=False, engine='xlsxwriter')).decode()
+    # Write the DataFrame to an in-memory Excel file
+    excel_buffer = BytesIO()
+    file_data.to_excel(excel_buffer, index=False, engine='xlsxwriter')
+    
+    # Create a base64-encoded string of the Excel file's contents
+    b64 = base64.b64encode(excel_buffer.getvalue()).decode()
+    
+    # Generate the download link
     href = f'<a href="data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,{b64}" download="{file_name}">{link_text}</a>'
+    
     return href
 
+
 def pre_processing(data_frame):
 
     # Lowercase all characters