import streamlit as st
class MultiApp:
    def __init__(self):
        self.apps = []
    def add_app(self, title, func):
        self.apps.append({"title": title, "function": func})
    def run(self):
        st.sidebar.header("Tasks")
        app = st.sidebar.radio("", self.apps, format_func=lambda app: app["title"])
        app["function"]()