python开发中async如何使用？

import asyncio

async def print_num(num):

    print("Maoli is printing " + str(num) + " nows" )

    await asyncio.sleep(1)

    print("Maoli prints" + str(num) + " OK")

async def main(nums):

    for num in nums:

        await print_num(num)

%time asyncio.run(main([i for i in range(1,6)]))