Python: Co-process

#协程, also known as micro-threading, is a lightweight thread of user-state

#!usr/bin/env python
#-*-Coding:utf-8-*-

__author__ = "Samson"
#greenlet是协程 "Manual Stop Switching"
From Greenlet import Greenlet

def test1 ():
    Print (12)
    T2.switch () #切换到协程t2
    Print (36)
    T2.switch ()

Def test2 ():
    Print (48)
    T1.switch ()
    Print (60)

T1 = Greenlet (test1) #启动一个协程
T2 = Greenlet (test2)

T1.switch ()

 #!usr/bin/env python 
 #-*-coding:utf-8-*-
 
 __author__ = "Samson" 
 #greenlet是协程 "Auto block toggle" 
 Import Gevent 
 
 def foo (): 
 Print ("Running in foo") 
 Gevent.sleep (2) #模仿io操作 
 Print ("Explicit context SWITC    H to foo again ") 
 
 
 def Bar (): 
 Print (" Explicit precise context content to bar ") 
 Gevent.sleep (1) # mimic IO operation 
 Print ("Implicit context switch back to bar") 
 
 Gevent.joinall ([
 Gevent.spawn (foo), 
 Gevent . Spawn (bar), 
]) 
 
 
 co-crawler 

#!usr/bin/env python
#-*-Coding:utf-8-*-

__author__ = "Samson"

From Urllib Import Request
Import Gevent,time
From gevent Import Monkey

Monkey.patch_all () #将当前所有程序io操作单独做上标记 so that the crawler can be used in a co-process mode, otherwise it will be serial

def f (URL):
    Print ("Get:%s"%url)
    resp = request.urlopen (URL)
    data = Resp.read ()
    Print ("%d bytes received from%s."% ( Len (data), URL))

URLs = ["https://www.python.org/",
    "https://www.yahoo.com/",
    "https://github.com/"]
Time_start = Time.time ()
For URL in URLs:
    F (URL)
Print ("Sync Cost", Time.time ()-time_start)

Async_time_start = Time.time ()
Gevent.joinall ([
    Gevent.spawn (F, "https://www.python.org/"),
    Gevent.spawn (F, "https://www.yahoo.com/"),
    Gevent.spawn (F, "https://github.com/"),
])
Print ("HS Cost", Time.time ()-async_time_start)

Python: Co-process