exception
使用exception是为了程序健壮性考虑，在程序退出的时候做好文件关闭，资源释放等工作，当然清晰的提示也是很重要。
import traceback
fid = open()
try:
pass
except Exception as e:
print(traceback.fomat_exe()) # 不像print(e)，只打印最后出错，而是会递归的找到最开始出错的地方
finally:
fid.close()
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