python 多程序與子程序

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1. #!/usr/bin/env python3
2. #-*- coding:utf-8 -*-
3. '''
5. #多程序,pool
6. from multiprocessing import Process
7. from multiprocessing import Pool
8. import os
9. import time
10. import random
11. def f(name):
12.     print('hello, %s,pid=%s' % (name, os.getpid()))
13. if __name__ == '__main__':
14.     print('Parent process %s ' % os.getpid())
15.     p=Process(target=f, args=('talen',))
16.     print('Child process will start.')
17.     p.start()
18.     p.join()
19.     print('Child process end')
20. def long_time_task(name):
21.     print('Run task %s (%s)...' % (name,os.getpid()))
22.     start=time.time()
23.     time.sleep(random.random() * 3)
24.     end=time.time()
25.     print('Task %s runs %0.2f seconds' % (name,(end - start )))
28.     pp=Pool(4)
29.     for i in range(6):
30.         pp.apply_async(long_time_task,args=(i,))
32.     pp.close()
33.     pp.join()
35. #子程序
36. import subprocess
37. print('$ nslookup htfchina.blog.chinaunix.net')
38. r = subprocess.call(['nslookup','htfchina.blog.chinaunix.net'])
39. print('Exit code :',r)
40. #輸入網址
41. print('$ nslookup')
42. subp=subprocess.Popen(['nslookup '], shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
43. output, err = subp.communicate(b'set q=mx\nwww.baidu.com\nexit\n')
44. print(output.decode('utf-8'))
45. print('Exit code:',subp.returncode)

1. /usr/bin/python3 /home/t/PycharmProjects/untitled/mutliprocessing_t.py
2. Parent process 14001
3. Child process will start.
4. hello, talen,pid=14002
5. Child process end
8. Run task 0 (14003)...
9. Run task 1 (14004)...
10. Run task 2 (14005)...
11. Run task 3 (14006)...
12. Task 3 runs 0.02 seconds
13. Run task 4 (14006)...
14. Task 0 runs 2.07 seconds
15. Run task 5 (14003)...
16. Task 1 runs 2.46 seconds
17. Task 4 runs 2.58 seconds
18. Task 2 runs 2.97 seconds
19. Task 5 runs 2.33 seconds
21. $ nslookup htfchina.blog.chinaunix.net
22. Server:        10.10.106.201
23. Address:    10.10.106.201#53
24. Non-authoritative answer:
25. Name:    htfchina.blog.chinaunix.net
26. Address: 61.55.167.140
27. Exit code : 0
28. $ nslookup
32. www.baidu.com    canonical name = www.a.shifen.com.
33. Authoritative answers can be found from:
34. a.shifen.com
35.     origin = ns1.a.shifen.com
36.     mail addr = baidu_dns_master.baidu.com
37.     serial = 1605030003
38.     refresh = 5
39.     retry = 5
40.     expire = 86400
41.     minimum = 3600
42. Exit code: 0
43. Process finished with exit code 0