携程greenlet模块使用

import greenlet


def f1():
    print(11)
    gr2.switch()
    print(22)
    gr2.switch()


def f2():
    print(33)
    gr1.switch()
    print(44)


# 协程 gr1
gr1 = greenlet.greenlet(f1)
# 协程 gr2
gr2 = greenlet.greenlet(f2)

gr1.switch()