Update app.py

app.py

@@ -44,11 +44,17 @@ elif page == "NLP Techniques":
 # Pagination buttons
 if st.button("Previous Page"):
     if page == "NLP Techniques":
-        st.query_params(page=pages[0])
+        st.experimental_set_query_params(page="Introduction to NLP")
 
 if st.button("Next Page"):
     if page == "Introduction to NLP":
-        st.query_params(page=pages[1])
+        st.experimental_set_query_params(page="NLP Techniques")
+
+# Handle query params to set the active page
+query_params = st.experimental_get_query_params()
+if "page" in query_params and query_params["page"]:
+    page = query_params["page"][0]
+
 
 # Footer
 st.sidebar.write("---")