Update app.py

app.py

@@ -5,6 +5,16 @@ import streamlit as st
 import streamlit.components.v1 as components
 from IPython.display import IFrame
 
+def SetIframeURL(option_selected):
+    if (option_selected=='Book'):
+        src='https://oreilly-qc.github.io?p=2-1'
+    if (option_selected=='Grok'):
+        src='https://javafxpert.github.io/grok-bloch/'
+    if (option_selected=='Playground'):
+        src='https://davidbkemp.github.io/quantum-gate-playground/'
+    if (option_selected=='Circuit'):
+        src='https://algassert.com/quirk#circuit={%22cols%22:[[%22H%22],[%22Bloch%22],[%22Measure%22]]}'
+
 # query params exist
 try:
     options = ['Book', 'Grok', 'Playground', 'Circuit']
@@ -26,16 +36,6 @@ except: # catch exception and set query param to predefined value
         st.experimental_set_query_params(option=option_selected)
         SetIframeURL(option_selected)
 
-def SetIframeURL(option_selected):
-    if (option_selected=='Book'):
-        src='https://oreilly-qc.github.io?p=2-1'
-    if (option_selected=='Grok'):
-        src='https://javafxpert.github.io/grok-bloch/'
-    if (option_selected=='Playground'):
-        src='https://davidbkemp.github.io/quantum-gate-playground/'
-    if (option_selected=='Circuit'):
-        src='https://algassert.com/quirk#circuit={%22cols%22:[[%22H%22],[%22Bloch%22],[%22Measure%22]]}'
-
 # Render iframe contents
 st.components.v1.iframe(src, width=1200, height=800, scrolling=False)