Update app.py

app.py

@@ -41,6 +41,7 @@ def factorial(n):
 
 # callback to update query param on selectbox change
 def update_params():
+    print("update1")
     #try:
         #st.experimental_set_query_params(option=st.session_state.query)
     #except ValueError:
@@ -53,7 +54,8 @@ query_params = st.experimental_get_query_params()
 ix = 0
 if query_params:
     try:
-        ix = options.index(query_params['query'][0])
+        q0 = query_params['query'][0]
+        ix = options.index(q0)
     except ValueError:
         pass
 selected_option = st.radio(