gevent

# __author: "ZXYang"
# date: 2020/5/21

import gevent
import time


def f():
    print('11', time.ctime())
    gevent.sleep(1)  # 不能用time.sleep(1), cpu切换可以，此处是单线程不可以。
    print('22', time.ctime())


def g():
    print('33', time.ctime())
    gevent.sleep(2)
    print('44', time.ctime())


gevent.joinall([
    gevent.spawn(f),
    gevent.spawn(g),
])