multiapp.py

import streamlit as st

class MultiApp:
    def __init__(self, state):
        self.apps = []
        self.state = state

    def add_app(self, title, func):
        self.apps.append({"title": title, "function": func})

    def run(self):
        st.sidebar.header("Go To:")
        app = st.sidebar.radio(
            "", self.apps, format_func=lambda app: app["title"]
        )
        app["function"](self.state)