#coding=utf-8
from greenlet import greenlet
import time 

def test1():
	while True:
		print("---A")
		gr2.switch()
		time.sleep(0.5)
def test2():
	while True:
		print("-----B")
		gr1.switch()
		time.sleep(0.5)

gr1=greenlet(test1)
gr2=greenlet(test2)

#切换到gr1中运行
gr1.switch()

