delattr

>>> class MyData():

    def __init__(self,name,phone):
        self.name=name
        self.phone=phone
    def updatephone(self,newphone):
        self.phone=newphone
        print 'new phone is:',self.phone

>>> data=MyData('xiaodeng',28)  #实例化
>>> delattr(data,'name')
>>> data.__dict__
{'phone': 28}
>>>