Update app.py

app.py

@@ -1,4 +1,16 @@
 import streamlit as st
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+animal = st.form('my_animal')
+
+# This is writing directly to the main body. Since the form container is
+# defined above, this will appear below everything written in the form.
+sound = st.selectbox('Sounds like', ['meow','woof','squeak','tweet'])
+
+# These methods called on the form container, so they appear inside the form.
+submit = animal.form_submit_button(f'Say it with {sound}!')
+sentence = animal.text_input('Your sentence:', 'Where\'s the tuna?')
+say_it = sentence.rstrip('.,!?') + f', {sound}!'
+if submit:
+    animal.subheader(say_it)
+else:
+    animal.subheader(' ')