python线程池(threadpool)

一、安装

pip install threadpool   

二、使用介绍

(1)引入threadpool模块

(2)定义线程函数   

(3)创建线程 池threadpool.ThreadPool()   

(4)创建需要线程池处理的任务即threadpool.makeRequests()   

(5)将创建的多个任务put到线程池中,threadpool.putRequest   

(6)等到所有任务处理完毕theadpool.pool()

import threadpool  
def ThreadFun(arg1,arg2):  
    pass  
def main():  
    device_list=[object1,object2,object3......,objectn]#需要处理的设备个数  
    task_pool=threadpool.ThreadPool(8)#8是线程池中线程的个数  
    request_list=[]#存放任务列表  
    #首先构造任务列表  
    for device in device_list:  
        request_list.append(threadpool.makeRequests(ThreadFun,[((device, ), {})]))  
    #将每个任务放到线程池中,等待线程池中线程各自读取任务,然后进行处理,使用了map函数,不了解的可以去了解一下。  
    map(task_pool.putRequest,request_list)  
    #等待所有任务处理完成,则返回,如果没有处理完,则一直阻塞  
    task_pool.poll()  
if __name__=="__main__":  
    main()  

说明:makeRequests存放的是要开启多线程的函数,以及函数相关参数和回调函数,其中回调函数可以不写(默认是无),也就是说makeRequests只需要2个参数就可以运行。

 

二、代码实例

 
import time
def sayhello(str): print "Hello ",str time.sleep(2) name_list =['xiaozi','aa','bb','cc']
start_time = time.time() for i in range(len(name_list)): sayhello(name_list[i]) print '%d second'% (time.time()-start_time)
 

改用线程池代码,花费时间更少,更效率

 
import time
import threadpool  
def sayhello(str):
    print "Hello ",str
    time.sleep(2)

name_list =['xiaozi','aa','bb','cc']
start_time = time.time()
pool = threadpool.ThreadPool(10) 
requests = threadpool.makeRequests(sayhello, name_list) 
[pool.putRequest(req) for req in requests] 
pool.wait() 
print '%d second'% (time.time()-start_time)
 

 

 当函数有多个参数的情况,函数调用时第一个解包list,第二个解包dict,所以可以这样:

 
def hello(m, n, o):
    """"""
    print "m = %s, n = %s, o = %s"%(m, n, o)
     
 
if __name__ == '__main__':
     
   # 方法1  
    lst_vars_1 = ['1', '2', '3']
    lst_vars_2 = ['4', '5', '6']
    func_var = [(lst_vars_1, None), (lst_vars_2, None)]
    # 方法2
    dict_vars_1 = {'m':'1', 'n':'2', 'o':'3'}
    dict_vars_2 = {'m':'4', 'n':'5', 'o':'6'}
    func_var = [(None, dict_vars_1), (None, dict_vars_2)]    
     
    pool = threadpool.ThreadPool(2)
    requests = threadpool.makeRequests(hello, func_var)
    [pool.putRequest(req) for req in requests]
    pool.wait()        
 

 需要把所传入的参数进行转换,然后带人线程池。

 
def getuserdic():
    username_list=['xiaozi','administrator']
    password_list=['root','','abc123!','123456','password','root']
    userlist = []
    
    for username in username_list:
        
        user =username.rstrip()
        for password in password_list:
            pwd = password.rstrip()
            userdic ={}
            userdic['user']=user
            userdic['pwd'] = pwd
            tmp=(None,userdic)
            userlist.append(tmp)
    return userlist
 

 

扩展阅读:

Python 多进程 multiprocessing.Pool类详解

posted @ 2018-03-26 16:14  张老师的小黑屋  阅读(47576)  评论(1编辑  收藏  举报