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forms.form_process2.py

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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)