多进程

多进程2

 1 import time
 2 from multiprocessing import Process
 3 import os
 4 
 5 
 6 def dance(num, name):
 7     print('Process of basketball is %s.' % os.getpid())
 8     for i in range(num):
 9         print(name+' is playing basketball right now.')
10         time.sleep(0.5)
11 
12 
13 def sing(num, name):
14     print('Process of the guitar is %s.' % os.getpid())
15     for i in range(num):
16         print(name+' is playing the guitar next door.')
17         time.sleep(0.5)
18 
19 
20 if __name__ == '__main__':
21     print('Parent process: %s.' % os.getpid())
22     # 下面这两个是在创建子进程对象并指定执行的任务名
23     # target就是指定函数名,args就是参数
24     # 若使用元组,参数位置必须按照定义的函数的顺序来写
25     p = Process(target=dance, args=(2, 'Bob'))  # 只传一个参数时，加个逗号，否则解释器会认为这不是一个元祖而是一个数字
26     f = Process(target=sing, kwargs={'num': 2, 'name': 'Eric'})  # 使用字典时,甚至可以不按顺序,只要参数名称对就可以
27     # 启动子进程并执行任务
28     p.start()
29     f.start()
30     p.join()
31     f.join()
32     print('Boys love these things.')