pdb debug python

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如果是命令行debug的话，只要加上 -m pdb。可以看到(Pdb)就可以debug了。看到举例如下：
/grub-master$ python -m pdb util/import_unicode.py unicode/UnicodeData.txt unicode/BidiMirroring.txt unicode/ArabicShaping.txt grub-core/unidata.c
> /home/tao/grub-master/util/import_unicode.py(19)<module>()
-> import re
(Pdb)
输入help 可以得到pdb的所有命令
(Pdb) help

Documented commands (type help <topic>):
========================================
EOF    bt         cont      enable jump pp       run      unt
a      c          continue exit    l     q        s        until
alias cl         d         h       list quit     step     up
args   clear      debug     help    n     r        tbreak   w
b      commands   disable   ignore next restart u        whatis
break condition down      j       p     return   unalias where

Miscellaneous help topics:
==========================
exec pdb

Undocumented commands:
======================
retval rv

常用的就是
查看：l
(Pdb) l
14     #*
15     #* You should have received a copy of the GNU General Public License
16     #* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
17     #*
18
19 ->   import re
20     import sys
21
22     if len (sys.argv) < 3:
23          print ("Usage: %s SOURCE DESTINATION" % sys.argv[0])
24          exit (0)

断点设置：b + 行号
(Pdb) b 22
Breakpoint 1 at /home/tao/grub-master/util/import_unicode.py:22

继续运行：c
(Pdb) c
> /home/tao/grub-master/util/import_unicode.py(22)<module>()
-> if len (sys.argv) < 3:

查看变量：p
(Pdb) p sys.argv
['util/import_unicode.py', 'unicode/UnicodeData.txt', 'unicode/BidiMirroring.txt', 'unicode/ArabicShaping.txt', 'grub-core/unidata.c']

看到堆栈：bt
(Pdb) bt
/usr/lib/python2.7/bdb.py(400)run()
-> exec cmd in globals, locals
<string>(1)<module>()
> /home/tao/grub-master/util/import_unicode.py(22)<module>()
-> if len (sys.argv) < 3:
单步运行：n
(Pdb) n
> /home/tao/grub-master/util/import_unicode.py(25)<module>()
-> infile = open (sys.argv[3], "r")
(Pdb)
> /home/tao/grub-master/util/import_unicode.py(26)<module>()
-> joining = {}
(Pdb)
> /home/tao/grub-master/util/import_unicode.py(27)<module>()
-> for line in infile:
(Pdb)
> /home/tao/grub-master/util/import_unicode.py(28)<module>()
-> line = re.sub ("#.*$", "", line)

退出：q
第二中方式是在原文件中加测试点，相当于断点
首先在源文件中埋断点：
for line in infile:
     line = re.sub ("#.*$", "", line)
     line = line.replace ("\n", "")
     line = line.replace (" ", "")
     if len (line) == 0 or line[0] == '\n':
         continue
     sp = line.split (";")
     curcode = int (sp[0], 16)
     import pdb
     pdb.set_trace()

然后直接运行就可以看到程序停在我们加pdb.set_trace()的下一行了

~/grub-master$ python util/import_unicode.py unicode/UnicodeData.txt unicode/BidiMirroring.txt unicode/ArabicShaping.txt grub-core/unidata.c
> /home/tao/grub-master/util/import_unicode.py(37)<module>()
-> if sp[2] == "U":

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