greenlet模块使用
"""
greenlet: 底层由源生c写成.
greenlet() 创建对象.
obj.switch() 切换函数.
切换着运行.
"""
import greenlet
def test1():
print(1)
gr2.switch()
print(3)
gr2.switch()
def test2():
print(2)
gr1.switch()
print(4)
gr1 = greenlet.greenlet(test1)
gr2 = greenlet.greenlet(test2)
gr1.switch()