update app.py

app.py

@@ -1,4 +1,14 @@
 import streamlit as st
 
-x = st.slider('Select a value')
-st.write(x, 'squared is', x * x)
+# Using object notation
+add_selectbox = st.sidebar.selectbox(
+    "How would you like to be contacted?",
+    ("Email", "Home phone", "Mobile phone")
+)
+
+# Using "with" notation
+with st.sidebar:
+    add_radio = st.radio(
+        "Choose a shipping method",
+        ("Standard (5-15 days)", "Express (2-5 days)")
+    )