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import streamlit as st if "sum" not in st.session_state: st.session_state.sum = "" def sum(): result = st.session_state.a + st.session_state.b st.session_state.sum = result col1, col2 = st.columns(2) col1.title("Sum:") if isinstance(st.session_state.sum, float): col2.title(f"{st.session_state.sum:.2f}") with st.form("addition"): st.number_input("a", key="a") st.number_input("b", key="b") st.form_submit_button("add", on_click=sum)