app.py

import streamlit as st
from state import provide_state
import json

INITIAL_CONF = {
    "checkbox": False,
    "number": 0.0
}

@provide_state
def main(state):
    query_params = st.experimental_get_query_params()
    if "conf" in query_params:
        state.conf = json.loads(query_params["conf"][0])
    state.conf = state.conf or INITIAL_CONF

    state.conf["checkbox"] = st.checkbox("Retain State !", value=state.conf["checkbox"])
    state.conf["number"] = st.number_input("You Too Retain State !", value=state.conf["number"])
    st.experimental_set_query_params(**{"conf": json.dumps(state.conf)})

main()