Update app.py

app.py

@@ -1,3 +1,4 @@
+import os
 import streamlit as st
 from PyPDF2 import PdfReader
 from langchain.text_splitter import CharacterTextSplitter
@@ -19,7 +20,7 @@ def main():
     pdf_files = st.file_uploader("Upload your PDF files", type="pdf", accept_multiple_files=True)
     
     if pdf_files:
-        for pdf_file in pdf_files:
+        for idx, pdf_file in enumerate(pdf_files):
             pdf_reader = PdfReader(pdf_file)
             
             text = ""
@@ -37,7 +38,7 @@ def main():
             embeddings = OpenAIEmbeddings()
             knowledge_base = FAISS.from_texts(chunks, embeddings)
             
-            user_question = st.text_input("Ask a question about your PDF:")
+            user_question = st.text_input("Ask a question about your PDF:", key=f"question_{idx}")
             if user_question:
                 docs = knowledge_base.similarity_search(user_question)