1. 代码

import time


def task_1():
    while True:
        print("------------1-------------")
        time.sleep(0.1)
        yield


def task_2():
    while True:
        print("------------2-------------")
        time.sleep(0.1)
        yield


def main():
    t1 = task_1()
    t2 = task_2()
    while True:
        next(t1)
        next(t2)


if __name__ == "__main__":
    main()