这就是你需要的
http://ynniv.com/blog/2007/11/debugging- python.html
三种方式，第一种是简单但粗略的方法（Thomas Heller）-将以下内容添加到site-packages / sitecustomize.py中：
import pdb, sys, traceback
def info(type, value, tb):
traceback.print_exception(type, value, tb)
pdb.pm()
sys.excepthook = info
第二个更为复杂，并从菜谱中检查交互模式（奇怪地跳过了交互模式下的调试）：
# code snippet, to be included in 'sitecustomize.py'
import sys
def info(type, value, tb):
if hasattr(sys, 'ps1') or not sys.stderr.isatty():
# we are in interactive mode or we don't have a tty-like
# device, so we call the default hook
sys.__excepthook__(type, value, tb)
else:
import traceback, pdb
# we are NOT in interactive mode, print the exception...
traceback.print_exception(type, value, tb)
print
# ...then start the debugger in post-mortem mode.
pdb.pm()
sys.excepthook = info
第三个（ynniv）（除非重定向stdin或stderr，否则始终启动调试器）
# code snippet, to be included in 'sitecustomize.py'
import sys
def info(type, value, tb):
if (#hasattr(sys, "ps1") or
not sys.stderr.isatty() or
not sys.stdin.isatty()):
# stdin or stderr is redirected, just do the normal thing
original_hook(type, value, tb)
else:
# a terminal is attached and stderr is not redirected, debug
import traceback, pdb
traceback.print_exception(type, value, tb)
print
pdb.pm()
#traceback.print_stack()
original_hook = sys.excepthook
if sys.excepthook == sys.__excepthook__:
# if someone already patched excepthook, let them win
sys.excepthook = info
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