import uasyncio as asyncio
import time
async def co_task1():
    print("co task1 start!")
    await asyncio.sleep(2)
    print("co task1 end!")

async def co_task2():
    print("co task2 start!")
    await asyncio.sleep(4)
    print("pull up co_extra_task.")
    asyncio.create_task(co_extra_task())
    while True:
        await asyncio.sleep(4)
        print("co task2 loop!")

async def co_extra_task():
    print("co extra task run!")
    while True:
        await asyncio.sleep(2)
        print("co extra task loop!")

async def main():
    print("Main start!")
    while True:
        await asyncio.sleep(1)
        print("Current tick:", time.time())


asyncio.create_task(co_task1())
print("create co task1")
time.sleep(1)
asyncio.create_task(co_task2())
print("create co task2")
time.sleep(1)


asyncio.run(main())