Update app.py

app.py

@@ -76,12 +76,11 @@ with gr.Blocks(css=css) as demo:
         with gr.Column():
             pdf_doc = gr.File(label="Load a PDF", file_types=['.pdf'], type="file")
             load_pdf = gr.Button("Load PDF")
-            Books = gr.Dropdown(label="Books", choices=[("Book 1","Book1") , ("Book 2","Book2") , ("Book 3","Book3")] )
+            Books = gr.Dropdown(label="Books", choices=[("Harry Potter and the Philosopher's Stone","Book1") , ("Harry Potter and the Chamber of Secrets","Book2") , ("Harry Potter and the Order of the Phoenix","Book3")] )
             langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False)
         chatbot = gr.Chatbot([], elem_id="chatbot").style(height=350)
         question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter ")
-        submit_btn = gr.Button("Send message")
-    #load_pdf.click(loading_pdf, None, langchain_status, queue=False)    
+        submit_btn = gr.Button("Send message") 
     Books.change(book_changes, inputs=[Books], outputs=[langchain_status], queue=False)
     load_pdf.click(pdf_changes, inputs=[pdf_doc], outputs=[langchain_status], queue=False)
     question.submit(add_text, [chatbot, question], [chatbot, question]).then(