1 >>> class PClass(object):
 2     def setInfo(self,sex=‘Male‘):
 3         self.gender = sex
 4 
 5         
 6 >>> class CClass(PClass):
 7     def setInfo(self,who):
 8         self.name = who
 9         PClass.setInfo(self)＃子类继承父类后想要扩展父类方法，若仍想保留父类方法可以通过回调
10 
11         
12 >>> x = CClass()
13 >>> x.setInfo(‘Tom‘)
14 >>> x.name
15 ‘Tom‘
16 >>> x.gender
17 ‘Male‘