python之系统编程 --进程

[root@master gaoji]# vim test2.py
  1 #!/usr/local/bin/python3
  2 # -*- coding:utf-8 -*-
  3 
  4 def getAverage(a,b):
  5     result = a + b
  6     print("result=%d" %result)
  7     return result
  8 
  9 a = 100
 10 b = 200
 11 c = a + b
 12 ret = getAverage(a,b)
 13 print(ret)

[root@master gaoji]# python3 -m pdb test2.py 
> /home/weixin/gaoji/test2.py(4)<module>()
-> def getAverage(a,b):
(Pdb) l
  1     #!/usr/local/bin/python3
  2     # -*- coding:utf-8 -*-
  3  
  4  -> def getAverage(a,b):
  5         result = a + b
  6         print("result=%d" %result)
  7         return result
  8  
  9     a = 100
 10     b = 200
 11     c = a + b
(Pdb) 

[root@master process]# vim 01-进程.py     
  1 #!/usr/local/bin/python3
  2 # -*- coding:utf-8 -*-
  3 
  4 import os
  5 import time
  6 ret = os.fork()
  7 
  8 if ret == 0:
  9     print(‘---子进程1---‘)
 10     time.sleep(5)
 11     print(‘---子进程2---‘)
 12 else:
 13     print(‘---父进程---‘)
 14     time.sleep(3)
 15 
 16 print(‘---over---‘)

[root@master 进程]# vim 02-进程.py     
  1 #!/usr/local/bin/python3
  2 # -*- coding:utf-8 -*-
  3 
  4 
  5 import os-
  6 import time
  7 g_sum = 100
  8 
  9 pid = os.fork()
 10 if pid == 0:
 11     print(‘---process-01---‘)
 12     g_sum += 1
 13     print(‘---process-01--%d‘ %g_sum)
 14 else:
 15     time.sleep(3)                    ###为了保证让子进程优先运行
 16     print(‘---process-02---‘)
 17     print(‘---process-02--%d‘ %g_sum)
 18 

[root@master 进程]# python3 02-进程.py 
---process-01---
---process-01--101
---process-02---
---process-02--100        ###结果还是100，并没与变成101