Python类继承的例子 python继承与多重继承

python中继承实现方法

派生类继承形式为：
class DerivedClass(BaseClass):
 
[注意]
[1] Python不会自动调用基类的constructor，要亲自专门调用它。在方法调用之前加上类名前缀，然后把self变量及其他参数传递给它。
[2] Python总是首先查找对应类型的方法，如果它不能在派生类中找到对应的方法，它才开始到基类中查找。
[3] 基类是在派生类定义时，在元组之中指明的。
[4] 如果在继承元组中列了一个以上的类，那么它就被称作多重继承。
 

#! /usr/bin/python  
# Filename: inherit.py  
# 2010-7-14 wcdj 
# www.jb200.com
class SchoolMember:  
        '''''Represents any school member.'''  
        def __init__(self, name, age):  
                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), # note, this comma  
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  
class Student(SchoolMember):  
        '''''Represents a student.'''  
        def __init__(self, name, age, marks):  
                SchoolMember.__init__(self, name, age)  
                self.marks=marks  
                print '(Initialized Student:%s)' % self.name  
        def tell(self):  
                SchoolMember.tell(self)  
                print 'Marks:"%d"' % self.marks  
t=Teacher('Mr. Young', 40, 30000)  
s=Student('wcdj', 22, 75)  
print # prints a blank line  
members=[t, s]  
for i in members:  
        i.tell() # works for both Teachers and Students  
#########  
# output  
#########  
>>>   
(Initialized SchoolMember:Mr. Young)  
(Initialized Teacher:Mr. Young)  
(Initialized SchoolMember:wcdj)  
(Initialized Student:wcdj)  
Name:"Mr. Young" Age:"40" Salary:"30000"  
Name:"wcdj" Age:"22" Marks:"75"