本文通过具体实例演示了Python中如何使用多进程进行并发任务处理，包括基本的Process应用及Pool的高级用法，并展示了如何利用subprocess执行外部命令。
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#!/usr/bin/env python3
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#-*- coding:utf-8 -*-
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'''
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'''
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#多进程,pool
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from multiprocessing import Process
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from multiprocessing import Pool
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import os
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import time
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import random
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def f(name):
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print('hello, %s,pid=%s' % (name, os.getpid()))
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if __name__ == '__main__':
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print('Parent process %s ' % os.getpid())
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p=Process(target=f, args=('talen',))
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print('Child process will start.')
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p.start()
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p.join()
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print('Child process end')
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def long_time_task(name):
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print('Run task %s (%s)...' % (name,os.getpid()))
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start=time.time()
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time.sleep(random.random() * 3)
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end=time.time()
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print('Task %s runs %0.2f seconds' % (name,(end - start )))
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if __name__ == '__main__':
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print('Parent process %s ' % os.getpid())
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pp=Pool(4)
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for i in range(6):
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pp.apply_async(long_time_task,args=(i,))
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print('Child process will start.')
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pp.close()
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pp.join()
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print('Child process end')
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#子进程
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import subprocess
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print('$ nslookup htfchina.blog.chinaunix.net')
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r = subprocess.call(['nslookup','htfchina.blog.chinaunix.net'])
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print('Exit code :',r)
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#输入网址
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print('$ nslookup')
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subp=subprocess.Popen(['nslookup '], shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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output, err = subp.communicate(b'set q=mx\nwww.baidu.com\nexit\n')
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print(output.decode('utf-8'))
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/usr/bin/python3 /home/t/PycharmProjects/untitled/mutliprocessing_t.py
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Parent process 14001
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Child process will start.
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hello, talen,pid=14002
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Child process end
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Parent process 14001
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Child process will start.
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Run task 0 (14003)...
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Run task 1 (14004)...
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Run task 2 (14005)...
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Run task 3 (14006)...
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Task 3 runs 0.02 seconds
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Run task 4 (14006)...
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Task 0 runs 2.07 seconds
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Run task 5 (14003)...
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Task 1 runs 2.46 seconds
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Task 4 runs 2.58 seconds
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Task 2 runs 2.97 seconds
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Task 5 runs 2.33 seconds
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Child process end
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$ nslookup htfchina.blog.chinaunix.net
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Server: 10.10.106.201
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Address: 10.10.106.201#53
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Non-authoritative answer:
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Name: htfchina.blog.chinaunix.net
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Address: 61.55.167.140
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Exit code : 0
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$ nslookup
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Server: 10.10.106.201
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Address: 10.10.106.201#53
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Non-authoritative answer:
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www.baidu.com canonical name = www.a.shifen.com.
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Authoritative answers can be found from:
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a.shifen.com
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origin = ns1.a.shifen.com
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mail addr = baidu_dns_master.baidu.com
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serial = 1605030003
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refresh = 5
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retry = 5
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expire = 86400
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minimum = 3600
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Exit code: 0
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- Process finished with exit code 0
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