方法一：捕获所有异常
try
a=b
b=c
except Exception,ex:
print Exception,':',ex
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方法二：采用traceback模块查看异常
import traceback
try:
a=b
b=c
except:
traceback.print_exc()
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方法三：采用sys模块回溯最后的异常
import sys
try:
a=b
b=c
except:
info=sys.exc_info()
print info[0],':',info[1]
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把 traceback.print_exc() 打印在屏幕上的信息保存到一个文本文件中
try:
a=b
b=c
except:
f=open('c:\log.txt','a')
traceback.print_exc(file=f)
f.flush()
f.close()
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