多程序

多程序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     # 下面這兩個是在建立子程序物件並指定執行的任務名
23     #
 
 target就是指定函式名,args就是引數
24     # 若使用元組,引數位置必須按照定義的函式的順序來寫
25     p = Process(target=dance, args=(2, 'Bob'))  # 只傳一個引數時，加個逗號，否則直譯器會認為這不是一個元祖而是一個數字
26     f = Process(target=sing, kwargs={'num': 2, 'name': 'Eric'})  # 使用字典時,甚至可以不按順序,只要引數名稱對就可以
27     # 啟動子程序並執行任務
28     p.start()
29     f.start()
30     p.join()
 
31     f.join()
32     print('Boys love these things.')