基本类 或 超类：SchoolMember类

导出类 或 子类：Teacher和Student类

下面是一个示例

#!/usr/bin/python
# Filename: inherit.py

class SchoolMember:
    '''Represents any school member.'''
    def __init__(self, name, age):#__init__ method
        self.name = name
        self.age = age
        print '(Initialized SchoolMember: %s)' % self.name

    def tell(self):
        '''Tell my details.'''
        print 'Name:"%s" Age:"%s"' % (self.name, self.age),

class Teacher(SchoolMember):
    '''Represents a teacher.'''
    def __init__(self, name, age, salary):
        SchoolMember.__init__(self, name, age)
        self.salary = salary
        print '(Initialized Teacher: %s)' % self.name

    def tell(self):
        SchoolMember.tell(self)
        print 'Salary: "%d"' % self.salary