多进程，进程池。

 1 from multiprocessing import Process
 2 import time
 3 def f(name):
 4     time.sleep(1)
 5     print(‘hello‘, name,time.ctime())
 6 
 7 if __name__ == ‘__main__‘:
 8     p_list=[]
 9     for i in range(3):
10         p = Process(target=f, args=(‘alvin‘,))
11         p_list.append(p)
12         p.start()
13     for i in p_list:
14         i.join()
15     print(‘end‘)

1 hello alvin Tue Oct 18 15:10:28 2016
2 hello alvin Tue Oct 18 15:10:28 2016
3 hello alvin Tue Oct 18 15:10:28 2016
4 end

 1 from multiprocessing import Process
 2 import time
 3 
 4 class MyProcess(Process):
 5     def __init__(self):
 6         super(MyProcess, self).__init__()
 7         # self.name = name
 8 
 9     def run(self):
10         time.sleep(1)
11         print (‘hello‘, self.name,time.ctime())
12 
13 
14 if __name__ == ‘__main__‘:
15     p_list=[]
16     for i in range(3):
17         p = MyProcess()
18         p.start()
19         p_list.append(p)
20 
21     for p in p_list:
22         p.join()
23 
24     print(‘end‘)

1 hello MyProcess-1 Tue Oct 18 15:13:46 2016
2 hello MyProcess-2 Tue Oct 18 15:13:46 2016
3 hello MyProcess-3 Tue Oct 18 15:13:46 2016
4 end

 1 from multiprocessing import Process
 2 import os
 3 import time
 4 def info(title):
 5     print(title)
 6     print(‘module name:‘, __name__)
 7     print(‘parent process:‘, os.getppid())
 8     print(‘process id:‘, os.getpid())
 9 
10 
11 def f(name):
12     info(‘\033[31;1mfunction f\033[0m‘)
13     print(‘hello‘, name)
14 
15 if __name__ == ‘__main__‘:
16     info(‘\033[32;1mmain process line\033[0m‘)
17     time.sleep(5)
18     p = Process(target=info, args=(‘bob‘,))
19     p.start()
20     p.join()

1 main process line
2 module name: __main__
3 parent process: 11156
4 process id: 4592
5 bob
6 module name: __mp_main__
7 parent process: 4592
8 process id: 7280