python线程池(threadpool)

时间:2023-09-25 14:20:50

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)

python线程池(threadpool)

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)

python线程池(threadpool)

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