Python中的继承

转自：/article/3709484.html

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，我们要亲自专门调用它。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的时候，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

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"