1.如题：
gdb可以调试python的pdb么？
答案：可以，实验如下。
2.实验：
生成一个a.py代码文件，代码如下：
import pdb
a = 1
print "111",a
pdb.set_trace()
a = 2
print "222",a
gdb python
(gdb) b main
Breakpoint 1 at 0x400770: file ./Modules/python.c, line 23.
(gdb) b exit
Function "exit" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (exit) pending.
Breakpoint 2 (exit) pending.
(gdb) r a.py
Breakpoint 1, main (argc=2, argv=0x7fff6d9883f8) at ./Modules/python.c:23
23 ./Modules/python.c: No such file or directory.
in ./Modules/python.c =====================（到达main断点）
(gdb) c =====================（继续执行）
Continuing.
111 1
> /home/users/dodng/tmp/a.py(6)<module>()
-> a = 2
(Pdb) p a =====================（到达pdb断点，用pdb查看变量a的值）
1
(Pdb) n =====================（用pdb next）
> /home/users/dodng/tmp/a.py(7)<module>()
-> print "222",a
(Pdb) c
222 2
Breakpoint 3, 0x0000003f0b030c00 in exit () from /lib64/tls/libc.so.6
(gdb) bt =====================（到达exit断点）
#0 0x0000003f0b030c00 in exit () from /lib64/tls/libc.so.6
#1 0x0000003f0b01c4c2 in __libc_start_main () from /lib64/tls/libc.so.6
#2 0x00000000004006da in _start ()