greenlet手动切换协程
from greenlet import greenlet

def tes_1():
print(12)
gr2.switch()#协程手动切换
print(34)
gr2.switch()#协程切换

def tes_2():
print(56)
gr1.switch()#协程切换
print(78)

gr1 = greenlet(tes_1) #生成两个协程
gr2 = greenlet(tes_2)
gr1.switch()#协程切换

gevent自动切换协程
import gevent

def foo():
print("running in foo")
gevent.sleep(2) #IO阻塞2秒 自动切换下一个协程
print('Explict context switch to foo again')
def bar():
print("Explicit精确的 context上下文切换 to bar")
gevent.sleep(1)#IO阻塞1秒
print('Implicit context switch back to bar')
def func3():
print("running func3")
gevent.sleep(0)#IO不阻塞，释放 就先执行下面代码
print("running func3 again")

gevent.joinall([
gevent.spawn(foo),#生成协程
gevent.spawn(bar),
gevent.spawn(func3),
])