[root@shuffle-dev py_test]$ vim debug.py   
  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3 
  4 from __future__ import division
  5 import pdb
  6 import subprocess
  7 
  8 def _executeCmd(cmd):
  9     pdb.set_trace()                                                                                                                       
 10     try:
 11         p = subprocess.Popen(cmd,shell=True,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
 12         output = ""
 13         for line in p.stdout.readlines():
 14             output = output + line
 15         retval = p.wait()
 16         pdb.set_trace()
 17         return output
 18     except BaseException,e:
 19         pdb.set_trace()
 20         pass
 21 
 22 if __name__=='__main__':
 23     cmd="free -g | grep - | awk '{print $4}'"
 24     print _executeCmd(cmd)

[root@shuffle-dev py_test]$ python debug.py
> /root/py_test/debug.py(10)_executeCmd()
-> try:
(Pdb) l
  5     import pdb
  6     import subprocess
  7  
  8     def _executeCmd(cmd):
  9         pdb.set_trace()
 10  ->     try:
 11             p = subprocess.Popen(cmd,shell=True,stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
 12             output = ""
 13             for line in p.stdout.readlines():
 14                 output = output + line
 15             retval = p.wait()
(Pdb) p cmd
"free -g | grep - | awk '{print $4}'"
(Pdb) c
> /root/py_test/debug.py(17)_executeCmd()
-> return output
(Pdb) l
 12             output = ""
 13             for line in p.stdout.readlines():
 14                 output = output + line
 15             retval = p.wait()
 16             pdb.set_trace()
 17  ->         return output
 18         except BaseException,e:
 19             pdb.set_trace()
 20             pass
 21  
 22     if __name__=='__main__':
(Pdb) p output
'14\n'
(Pdb) l
 23         cmd="free -g | grep - | awk '{print $4}'"
 24         print _executeCmd(cmd)
[EOF]
(Pdb) c
14

自己寫的還是太垃圾，還是看別人的吧墨叛。

• http://blog.csdn.net/eric_sunah/article/details/56484912

[root@shuffle-dev py_test]$ vim utils.py
  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3 
  4 def add(a,b):
  5     return a+b  

[root@shuffle-dev py_test]$ vim debugBetter.py
  1 #!/usr/bin/env python
  2 # -*- coding: utf-8 -*-
  3 
  4 import utils
  5 
  6 def cal(a,b):
  7     import pdb;pdb.set_trace()                                                                                                            
  8     c=utils.add(a,b)
  9     print c
 10 
 11 if __name__=='__main__':
 12     cal(3,4)

[root@shuffle-dev py_test]$ python debugBetter.py
> /root/py_test/debugBetter.py(8)cal()
-> c=utils.add(a,b)
(Pdb) s
--Call--
> /root/py_test/utils.py(4)add()
-> def add(a,b):
(Pdb) l
  1     #!/usr/bin/env python
  2     # -*- coding: utf-8 -*-
  3  
  4  -> def add(a,b):
  5         return a+b
[EOF]
(Pdb) b 5
Breakpoint 1 at /root/py_test/utils.py:5
(Pdb) c
> /root/py_test/utils.py(5)add()
-> return a+b
(Pdb) n
--Return--
> /root/py_test/utils.py(5)add()->7
-> return a+b
(Pdb) n
> /root/py_test/debugBetter.py(9)cal()
-> print c
(Pdb) n
7
--Return--
> /root/py_test/debugBetter.py(9)cal()->None
-> print c
(Pdb) p c
7
(Pdb) q
Traceback (most recent call last):
  File "debugBetter.py", line 12, in <module>
    cal(3,4)
  File "debugBetter.py", line 9, in cal
    print c
  File "/usr/lib64/python2.6/bdb.py", line 50, in trace_dispatch
    return self.dispatch_return(frame, arg)
  File "/usr/lib64/python2.6/bdb.py", line 84, in dispatch_return
    if self.quitting: raise BdbQuit
bdb.BdbQuit

• 官方文檔：https://docs.python.org/2/library/pdb.html
• 另外參考：https://www.cnblogs.com/chinasun021/archive/2013/03/19/2969107.html
• http://blog.csdn.net/kevin_darkelf/article/details/50585970
• https://zhuanlan.zhihu.com/p/25942045
• http://lib.csdn.net/article/python/1390