继承:承创建的新类称为“子类”或“派生类”,被继承的类称为“基类”、“父类.
继承的过程，就是从一般到特殊的过程.要实现继承，可以通过“继承”（Inheritance）和“组合”（Composition）来实现
继承概念的实现方式主要有2类：实现继承、接口继承.
实现继承是指使用基类的属性和方法而无需额外编码的能力
接口继承是指仅使用属性和方法的名称、但是子类必须提供实现的能力(子类重构爹类方法)
组合方式实现多继承
# -*- coding:utf-8 -*-
__author__ = 'shisanjun' class School(object):
def __init__(self,name):
self.name=name def sayhi(self):
print("school name",self.name) class SchoolMember(object): menber=0 #公有属性
def __init__(self,name,age,sex):
self.name=name
self.age=age
self.sex=sex
self.enrool() #每个子类都运行 def enrool(self):
print('%s has enroll' %self.name)
SchoolMember.menber+=1 #累计增加，不能写this.menber+=menber这样写只会在子类调用的时候加1，没有传到父类 def tell(self): #打印所有用户信息，实现如下
print("-----info %s-----" %self.name)
for v,k in self.__dict__.items(): #返回子类的 所有成员属性的字典
print("%s:\t%s" %(v,k)) def __del__(self):
print("%s has del" %self.name)
SchoolMember.menber-=1 class Teacher(SchoolMember): def __init__(self,name,age,sex,salary,course,school):
#SchoolMember.__init__(self,name,age,sex) #经典类写法==SchoolMember.__init__(self,name,age,sex)
super(Teacher,self).__init__(name,age,sex ) #新类式类写法
self.salary=salary
self.course=course
self.school=school #组合继承，实现多继承 def teach(self):
print("school:%s teacher course %s" %(self.school.name,self.course)) class Student(SchoolMember): def __init__(self,name,age,sex,tuition,course):
SchoolMember.__init__(self,name,age,sex)
self.tuition=tuition
self.course=course def pay_tuition(self):
print("the student pay ",self.tuition) school=School("南京大学")
t=Teacher("shi",23,"F",15000,"python",school) #组合继承，实现多继承
s=Student("san",26,'M',3000,"python")
t.teach() """
shi has enroll
san has enroll
school:南京大学 teacher course python
shi has del
san has del """
多继承
# -*- coding:utf-8 -*-
__author__ = 'shisanjun'
class A(object):
def request(self):
print('A.request')
def finish(self):
print('A.finish')
class C(A):
def request(self):
self.process()
print('C.request')
def finish(self):
print('C.finish')
class B(object):
def request(self):
print('B.request')
def process(self):
print('B.process')
self.finish()
def finish(self):
print('B.finish')
class D(C, B):
pass
obj = D()
obj.request() """
B.process
C.finish
C.request
"""