python pdb調試

在交互環境中一般使用pdb.run來調試:python

import pdb

def pdb_test(arg):
    for i in range(arg):
        print(i)
    return arg

pdb.run("pdb_test(3)")

 

 b 函數名、行號函數

     打斷點,b能夠查詢全部的斷點。spa

(Pdb) b pdb_test
Breakpoint 1 at c:\users\plpcc\desktop\pdbtest.py:3
(Pdb) b
Num Type         Disp Enb   Where
1   breakpoint   keep yes   at c:\users\plpcc\desktop\pdbtest.py:3

 

  c:調試

     運行程序,直到遇到斷點。blog

(Pdb) c
> c:\users\plpcc\desktop\pdbtest.py(4)pdb_test()
-> for i in range(arg):

 

   l:cmd

     查看斷點周圍的代碼string

(Pdb) l
  1  	import pdb
  2  	
  3 B	def pdb_test(arg):
  4  ->	    for i in range(arg):
  5  	        print(i)
  6  	    return arg
  7  	
  8  	pdb.run("pdb_test(3)")

 

  a:it

     查看參數io

(Pdb) a
arg = 3

 

  s, n:ast

     單步運行,區別s會進入路徑中的函數,n不會進入 

  p:

     查看錶達式的值

(Pdb) p i
0

  condition:

     條件斷點,只有條件爲true斷點才命中

> c:\users\plpcc\desktop\pdbtest.py(5)pdb_test()
-> print(i)
(Pdb) l
  1  	import pdb
  2  	
  3  	def pdb_test(arg):
  4  	    for i in range(arg):
  5 B->	        print(i)
  6  	    return arg
  7  	
  8  	pdb.run("pdb_test(3)")
[EOF]
(Pdb) b
Num Type         Disp Enb   Where
2   breakpoint   keep yes   at c:\users\plpcc\desktop\pdbtest.py:5
(Pdb) condition 2 i==1   //i==1時才觸發斷點2
New condition set for breakpoint 2.
(Pdb) b
Num Type         Disp Enb   Where
2   breakpoint   keep yes   at c:\users\plpcc\desktop\pdbtest.py:5
	stop only if i==1
(Pdb) c
0                       //i==0直接打印未斷住
> c:\users\plpcc\desktop\pdbtest.py(5)pdb_test()
-> print(i)             //觸發斷點,i==1
(Pdb) p i
1

  bt:

      查看調用堆棧

(Pdb) bt
  c:\python33\lib\bdb.py(405)run()
-> exec(cmd, globals, locals)
  <string>(1)<module>()
> c:\users\plpcc\desktop\pdbtest.py(5)pdb_test()
-> print(i)

  r:

      執行到函數返回

(Pdb) r
1
2
--Return--
> c:\users\plpcc\desktop\pdbtest.py(6)pdb_test()->3 //代碼位置、函數返回值->3
-> return arg                                       //代碼位置的語句
(Pdb) l
  1  	import pdb
  2  	
  3  	def pdb_test(arg):
  4  	    for i in range(arg):
  5  	        print(i)
  6  ->	    return arg
  7  	
  8  	pdb.run("pdb_test(3)")

 

經過pdb.set_trace() 在代碼中指定位置嵌入一個斷點,一般能夠經過調試開關來控制

import pdb

__DEBUG__ = True

def pdb_test(arg):
    if True == __DEBUG__:
        pdb.set_trace()
    for i in range(arg):
        print(i)
    return arg

pdb_test(3)

 

 運行後在pdb.set_trace()位置被斷住,當__DEBUG__ = False,代碼正常運行

> c:\users\plpcc\desktop\pdbtest.py(8)pdb_test()
-> for i in range(arg):
(Pdb) l
  3  	__DEBUG__ = True
  4  	
  5  	def pdb_test(arg):
  6  	    if True == __DEBUG__:
  7  	        pdb.set_trace()
  8  ->	    for i in range(arg):
  9  	        print(i)
 10  	    return arg
 11  	
 12  	pdb_test(3)
[EOF]

 

經過pdb.pm()進行過後調試,能夠跟蹤異常程序最後的堆載信息:

Traceback (most recent call last):
  File "C:\Users\plpcc\Desktop\pdbTest.py", line 13, in <module>
    pdb_test(3)
  File "C:\Users\plpcc\Desktop\pdbTest.py", line 10, in pdb_test
    1/0
ZeroDivisionError: division by zero
>>> import pdb
>>> pdb.pm()
> c:\users\plpcc\desktop\pdbtest.py(10)pdb_test()
-> 1/0
(Pdb) l
  5  	def pdb_test(arg):
  6  	    if True == __DEBUG__:
  7  	        pdb.set_trace()
  8  	    for i in range(arg):
  9  	        print(i)
 10  ->	        1/0
 11  	    return arg
 12  	
 13  	pdb_test(3)
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