Create a process using multiprocessing module

#_author: child star to 
#date: 2019/12/17 
from multiprocessing Import Process 
Import Time 
Import os 
two Method # two sub-processes will be called 
DEF child_1 (i): 
    Print ( 'child process (% s) started, parent process of (% S) '% (os.getpid (), os.getppid ())) 
    t_start the time.time = () 
    the time.sleep (I) 
    () = the time.time T_End 
    Print ( "child process (% s) execution time '% 0.2f' s "% (os.getpgid (), T_End-t_start)) 
DEF child_2 (I): 
    Print ( 'sub-process (% s) begins execution, the parent process of (% s) '% (os.getpid (), os.getppid ())) 
    t_start the time.time = () 
    the time.sleep (I) 
    T_End the time.time = () 
    Print ( "child process (% s) execution time'% 0.2f 's "% (os.getpgid (), T_End-t_start)) 
IF __name__ __ ==' __ main__ ': 
    Print (' ------- ------- parent process started ') 
    Print ( 'parent PID:% s'% os.getppid ( ))
    p1 = Process (target = child_1, args = (1,)) # instantiation process P1 
    P2 = Process (target = child_2, args = (2,)) Example # Process P2 
    p1.start () 
    p2.start () 
    # At the same time the parent process is still down implementation, if p2 process is still running, will return True 
    Print ( "p1.is_alive =% S"% p1.is_alive ()) 
    Print ( "p2.is_alive =% S"% p2. is_alive ()) 
    # outputs p1, p2 and aliases process PID 
    Print ( "% S = p1.name" p1.name%) 
    Print ( '% S = p1.pid' p1.pid%) 
    Print ( "p2.name % S = "p2.name%) 
    Print ( '% S = p2.pid' p2.pid%) 
    Print ( 'wait for the child ------- -------') 
    p1.join ( ) 
    p2.join () 
    Print ( 'end ------- ------- parent process') 
The result: 
------- ------- parent process started 
parent PID: 5580 
p1.is_alive = True 
P2.is_alive=True
p1.name=Process-1
2508 = p1.pid 
p2.name = Process-2 
p2.pid = 10164 
------- ------- wait for the child