from gevent import monkey;monkey.patch_all()
import time
import gevent
def eat():
    print("eating start")
    time.sleep(2)
    print("eating end")
def play():
    print("playing start")
    gevent.sleep(1)
    print("playing end")
g1 = gevent.spawn(eat)
g2 = gevent.spawn(play)
g1.join()
g2.join()

输出结果：
eating start
playing start
playing end
eating end