以下代码有什么问题(在Python2.7.1下):classTestFailed(BaseException):def__new__(self,m):self.message=mdef__str__(self):returnself.messagetry:raiseTestFailed('Oops')exceptTestFailedasx:printx当我运行它时，我得到:Traceback(mostrecentcalllast):File"x.py",line9,inraiseTestFailed('Oops')TypeError:exceptionsmustbeold-stylec
