Python 协程

手动协程操作：

# pip install gevent
from greenlet import greenlet

def test():
    print(‘He ‘)
    gr2.switch()
    print(‘a ‘)
    gr2.switch()

def test2():
    print(‘is ‘)
    gr1.switch()
    print(‘student.‘)

gr1 = greenlet(test)
gr2 = greenlet(test2)
gr1.switch()

2. 自动协程，遇到I/O自动切换