协程greenlet类

from greenlet import greenlet


def work1():
    for i in range(10):
        print(f'--------work1------{i}')
        g2.switch()


def work2():
    for i in range(10):
        print(f'--------work2------{i}')
        g1.switch()


g1 = greenlet(work1)
g2 = greenlet(work2)
g1.switch()   # 协程执行入口
g2.switch()