Update app.py

app.py

@@ -14,6 +14,10 @@ def main():
     st.set_page_config(page_title="Chat PDF")
     st.header("Chat PDF 💬")
 
+    # Initialize session state for chat history
+    if 'chat_history' not in st.session_state:
+        st.session_state.chat_history = []
+
     pdfs = st.file_uploader("Upload your PDF files", type="pdf", accept_multiple_files=True)
 
     text = ""
@@ -37,14 +41,21 @@ def main():
             docsearch = FAISS.from_texts(text_chunks, embeddings)
             llm = OpenAI()
 
-            chain = load_qa_chain(llm, chain_type="stuff")  
+            chain = load_qa_chain(llm, chain_type="your_chain_type_here")  # Replace with the actual chain type
 
             query = st.text_input("Type your question:")
 
             if query:
                 docs = docsearch.similarity_search(query)
                 response = chain.run(input_documents=docs, question=query)
-                st.write(response)
+
+                # Update chat history
+                st.session_state.chat_history.append({"question": query, "answer": response})
+                
+                # Display chat history
+                for chat in st.session_state.chat_history:
+                    st.text(f"Q: {chat['question']}\nA: {chat['answer']}")
+                    st.write("---")
 
         except Exception as e:
             st.error(f"An error occurred: {e}")