多任务5-协程（IO密集型适用）--gevent完成多任务及monkey补丁

代码：

import gevent


def f1(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        gevent.sleep(1)

def f2(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        gevent.sleep(0.1)


def f3(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        gevent.sleep(0.2)


print("---1---")
# gevent比greenlet好的地方是，遇到sleep自动切换，但是不支持time.sleep（），支持gevent.sleep()
# 不止是sleep，但凡延时或者堵塞的东西全要换成gevent里面的
g1 = gevent.spawn(f1,5)
print("---2---")
g2 = gevent.spawn(f2,5)
print("---3---")
g3 = gevent.spawn(f3,5)
print("---4---")
g1.join()
g2.join()
g3.join()

结果：

---1---
---2---
---3---
---4---
<Greenlet at 0x1ba58dbc648: f1(5)> 0
<Greenlet at 0x1ba58dbc948: f2(5)> 0
<Greenlet at 0x1ba58dbca48: f3(5)> 0
<Greenlet at 0x1ba58dbc948: f2(5)> 1
<Greenlet at 0x1ba58dbca48: f3(5)> 1
<Greenlet at 0x1ba58dbc948: f2(5)> 2
<Greenlet at 0x1ba58dbc948: f2(5)> 3
<Greenlet at 0x1ba58dbca48: f3(5)> 2
<Greenlet at 0x1ba58dbc948: f2(5)> 4
<Greenlet at 0x1ba58dbca48: f3(5)> 3
<Greenlet at 0x1ba58dbca48: f3(5)> 4
<Greenlet at 0x1ba58dbc648: f1(5)> 1
<Greenlet at 0x1ba58dbc648: f1(5)> 2
<Greenlet at 0x1ba58dbc648: f1(5)> 3
<Greenlet at 0x1ba58dbc648: f1(5)> 4

　　

这种比较麻烦，如果源代码里面用到time.sleep()或者socket中的堵塞，一个一个改会很麻烦，所以有了gevent的补丁

代码：

import gevent
import time
from gevent import monkey


monkey.patch_all()

def f1(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        time.sleep(1)


def f2(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        time.sleep(0.1)


def f3(n):
    for i in range(n):
        print(gevent.getcurrent(),i)
        time.sleep(0.2)


# print("---1---")
# # gevent比greenlet好的地方是，遇到sleep自动切换，但是不支持time.sleep（），支持gevent.sleep()
# # 不止是sleep，但凡延时或者堵塞的东西全要换成gevent里面的
# g1 = gevent.spawn(f1,5)
# print("---2---")
# g2 = gevent.spawn(f2,5)
# print("---3---")
# g3 = gevent.spawn(f3,5)
# print("---4---")
# g1.join()
# g2.join()
# g3.join()
# 一个一个join()很麻烦，可以放到joinall()的列表中
gevent.joinall([
    gevent.spawn(f1,5),
    gevent.spawn(f2,5),
    gevent.spawn(f3,5)

])

结果不变：

<Greenlet at 0x1a159007048: f1(5)> 0
<Greenlet at 0x1a159007248: f2(5)> 0
<Greenlet at 0x1a159007348: f3(5)> 0
<Greenlet at 0x1a159007248: f2(5)> 1
<Greenlet at 0x1a159007348: f3(5)> 1
<Greenlet at 0x1a159007248: f2(5)> 2
<Greenlet at 0x1a159007248: f2(5)> 3
<Greenlet at 0x1a159007348: f3(5)> 2
<Greenlet at 0x1a159007248: f2(5)> 4
<Greenlet at 0x1a159007348: f3(5)> 3
<Greenlet at 0x1a159007348: f3(5)> 4
<Greenlet at 0x1a159007048: f1(5)> 1
<Greenlet at 0x1a159007048: f1(5)> 2
<Greenlet at 0x1a159007048: f1(5)> 3
<Greenlet at 0x1a159007048: f1(5)> 4