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
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