ioloop = tornado.ioloop.IOLoop.instance() ioloop.start() def ping(self): print("pong!") # ============================================================================================================= _main = None _db = None #_menu = None if __name__ == "__main__": print("main") _main = main() #Menu.Instance().number = 10 print("creating menu") _menu = Menu() print("created menu") _menu.number = 10 _db = DatabaseManager() _db.connect() _main.launch_server() _main.show_index()