app.py

import streamlit as st
import uuid

def get_user_id():
    if "user_id" not in st.session_state:
        query_params = st.query_params
        user_id = query_params.get("user_id", None)
        if not user_id:
            user_id = str(uuid.uuid4())
            st.query_params["user_id"] = user_id
        st.session_state.user_id = user_id
    return st.session_state.user_id

user_id = get_user_id()
st.write(f"Your unique ID is: {user_id}")