Create app.py

app.py

@@ -0,0 +1,20 @@
+import streamlit as st
+
+# Input fields
+a = st.number_input("First value", 1, 1000)
+b = st.number_input("Second value", 1, 1000)
+
+# Perform an operation, and save its result
+if st.button("Compute value"):
+    result = a * b
+    st.experimental_set_query_params(my_saved_result=result)  # Save value
+
+# Retrieve app state
+app_state = st.experimental_get_query_params()  
+
+# Display saved result if it exist
+if "my_saved_result" in app_state:
+    saved_result = app_state["my_saved_result"][0]
+    st.write("Here is your result", saved_result)
+else:
+    st.write("No result to display, compute a value first.")