本文实例讲述了Python面向对象类继承和组合。分享给大家供大家参考，具体如下：
在python3中所有类默认继承object,凡是继承了object的类都成为新式类，以及该子类的子类Python3中所有的类都是新式类，没有集成object类的子类成为经典类(在Python2中没有集成object的类以及它的子类都是经典类
继承式用来创建新的类的一种方式，好处是减少重复代码
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class People: def __init__(self,name,age): self.name=name self.age=age def walking(self): print('%s is walking ' %self.name) def talking(self): print('%s is talking '%self.name)class Teacher(People): passclass Student(People): passt1=Teacher('egon',18)print(t1.name,t1.age)t1.walking()t1.talking()s1=Student('xiaobai',22)print(s1.name,s1.age)s1.talking()s1.walking() |
执行结果
egon 18
egon is walking
egon is talking
xiaobai 22
xiaobai is talking
xiaobai is walking
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class People: def __init__(self,name,age,sex): self.name=name self.age=age self.sex=sex def walking(self): print('%s is walking ' %self.name) def talking(self): print('%s is talking '%self.name)class Teacher(People): def __init__(self,name,age,sex,level,salary): People.__init__(name,age,sex) self.level=level self.salary=salary def teaching(self): People.talking(self) print('%s is teaching'%self.name)class Student(People): def __init__(self,name,age,sex,group): People.__init__(name,age,sex) self.group=group def studying(self): People.talking(self) print('%s is studying'%self.name) |
组合
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class Date: def __init__(self,year,mon,day): self.year=year self.mon=mon self.day=day def tell_birth(self): print('出生于<%s>年 <%s>月 <%s>日'%(self.year,self.mon,self.day))class Teacher: def __init__(self,name,age,sex,year,month,day): self.name=name self.age=age self.sex=sex self.birth=Date(year,month,day) def teaching(self): print('%s is teaching'%self.name)class Student: def __init__(self,name,age,sex,year,mon,day): self.name=name self.age=age self.sex=sex self.birth=Date(year,mon,day) def studying(self): print('%s is studying'%self.name)xiaobai=Student('xiaobai',22,'male','1995','3','16')xiaobai.birth.tell_birth() |
执行结果
出生于<1995>年 <3>月 <16>日
继承和组合
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class People: def __init__(self,name,age,sex,year,mon,day): self.name=name self.age=age self.sex=sex self.birth=Date(year,mon,day) def walking(self): print('%s is walking ' %self.name) def talking(self): print('%s is talking '%self.name)class Date: def __init__(self,year,mon,day): self.year=year self.mon=mon self.day=day def tell_birth(self): print('出生于<%s>年 <%s>月 <%s>日'%(self.year,self.mon,self.day))class Teacher(People): def __init__(self,name,age,sex,level,salary,year,mon,day): People.__init__(self,name,age,sex,year,mon,day) self.level=level self.salary=salary def teaching(self): People.talking(self) print('%s is teaching'%self.name)class Student(People): def __init__(self,name,age,sex,year,mon,day,group): People.__init__(self,name,age,sex,year,mon,day) self.group=group def studying(self): People.talking(self) print('%s is studying'%self.name) |
父类要限制
1、子类必须有父类的方法
2、子类实现的方法必须跟父类的方法的名字一样
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import abcclass File(metaclass=abc.ABCMeta): @abc.abstractclassmethod def read(self): pass @abc.abstractclassmethod def write(self): pass |
希望本文所述对大家Python程序设计有所帮助。
原文链接：https://www.cnblogs.com/c491873412/p/7112668.html
