1，如何实现在两个函数之间的切换？

(3
=(2(4

2,协程

greenlet greenlet
(5(<span style=”color: #0000ff”>def<span style=”color: #000000″> eat2():
<span style=”color: #0000ff”>print(<span style=”color: #800000″>'<span style=”color: #800000″>吃饺子1<span style=”color: #800000″>'<span style=”color: #000000″>)
g1.switch()
time.sleep(3<span style=”color: #000000″>)
<span style=”color: #0000ff”>print(<span style=”color: #800000″>'<span style=”color: #800000″>白切鸡<span style=”color: #800000″>'<span style=”color: #000000″>)

g1 =<span style=”color: #000000″> greenlet(eat1)
g2 =<span style=”color: #000000″> greenlet(eat2)
g1.switch()

3，gevent

gevent time
gevent
threading (1231(456<span style=”color: #0000ff”>def<span style=”color: #000000″> func2():
<span style=”color: #0000ff”>print(current_thread().name) <span style=”color: #008000″>#<span style=”color: #008000″> dummythread
<span style=”color: #0000ff”>print(<span style=”color: #800000″>'<span style=”color: #800000″>hahaha<span style=”color: #800000″>'<span style=”color: #000000″>)
time.sleep(1<span style=”color: #000000″>)
<span style=”color: #0000ff”>print(<span style=”color: #800000″>'<span style=”color: #800000″>10jq<span style=”color: #800000″>'<span style=”color: #000000″>)

g1 = gevent.spawn(func1) <span style=”color: #008000″>#<span style=”color: #008000″> 遇见他认识的io会自动切换的模块
g2 =<span style=”color: #000000″> gevent.spawn(func2)
gevent.joinall([g1,g2])

4，效率对比

gevent time
gevent

<span style=”color: #0000ff”>def<span style=”color: #000000″> task(args):
time.sleep(1<span style=”color: #000000″>)
<span style=”color: #0000ff”>print<span style=”color: #000000″>(args)

<span style=”color: #0000ff”>def sync_func(): <span style=”color: #008000″>#<span style=”color: #008000″> 同步
<span style=”color: #0000ff”>for i <span style=”color: #0000ff”>in range(10<span style=”color: #000000″>):
task(i)

<span style=”color: #0000ff”>def async_func(): <span style=”color: #008000″>#<span style=”color: #008000″> 异步
g_l =<span style=”color: #000000″> []
<span style=”color: #0000ff”>for i <span style=”color: #0000ff”>in range(10<span style=”color: #000000″>):
g_l.append(gevent.spawn(task,i)) <span style=”color: #008000″>#<span style=”color: #008000″> 给写成任务传参数
<span style=”color: #000000″> gevent.joinall(g_l)

start =<span style=”color: #000000″> time.time()
sync_func()
<span style=”color: #0000ff”>print(time.time() -<span style=”color: #000000″> start)

start =<span style=”color: #000000″> time.time()
async_func()
<span style=”color: #0000ff”>print(time.time() – start)