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import streamlit as st

if "sum" not in st.session_state:

st.session_state.sum = ""

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"):

a = st.number_input("a")

b = st.number_input("b")

submit = st.form_submit_button("add")

# The value of st.session_state.sum is updated at the end of the script rerun,

# so the displayed value at the top in col2 does not show the new sum. Trigger

# a second rerun when the form is submitted to update the value above.

st.session_state.sum = a + b

if submit:

st.rerun()