# -*- coding:utf-8 -*- import asyncio async def hello(i): print("hello ", i) await asyncio.sleep(3) print("world ", i) def main(): tasks = [] for i in range(4): tasks.append(hello(i)) loop = asyncio.get_event_loop() loop.run_until_complete(asyncio.wait(tasks)) loop.close() if __name__ == '__main__': main()