#解决代码重用的问题,减少代码冗余 #继承是一种什么‘是’什么的关系 class People: def __init__(self, name, age): # print('People.__init__') self.name = name self.age = age def walk(self): print('%s is walking' %self.name) class Teacher(People): pass class Student(People): pass # t=Teacher() # print(t.name,t.age) # print(t.__dict__) # t.walk() # s=Student() # print(s.name,s.age) # s.walk() #==================== class People: def __init__(self, name, age,sex): self.name = name self.age = age self.sex=sex def walk(self): print('%s is walking' % self.name) def foo(self): print('from father %s' %self.name) class Teacher(People): school = '偶的博爱' #__init__(t,,,) def __init__(self, name, age,sex,level,salary): People.__init__(self,name,age,sex) #People.__init__(t,,'male') #t.name='egon' #t.age= #t.sex='male' self.level=level self.salary=salary def teach(self): print('%s is teaching' %self.name) def foo(self): People.foo(self) print('from teacher') class Student(People): def __init__(self, name, age,sex,group): People.__init__(self, name, age, sex) self.group=group def study(self): print('%s is studying' %self.name) t=Teacher(,,) #__init__(t,,,) t.foo() # # class Teacher: # school = '偶的博爱' # def __init__(self, name, age): # self.name = name # self.age = age # def teach(self): # print('%s is teaching' %self.name) # def walk(self): # print('%s is walking' %self.name) # # # class Student: # def __init__(self, name, age): # self.name = name # self.age = age # # def study(self): # print('%s is studying' %self.name) # def walk(self): # print('%s is walking' %self.name)
继承
#继承是用来创建新的类的一种方式,好处是可以减少重复代码 #继承是类与类之间的关系,是一种什么是什么的关系 #组合:是一种什么有什么的关系,也是为了减少重复代码 class People: def __init__(self, name, age, year, mon, day): self.name = name self.age = age self.birth = Date(year, mon, day) def walk(self): print('%s is walking' % 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, year, mon, day,level,salary): People.__init__(self,name,age,year,mon,day) self.level=level self.salary=salary def teach(self): print('%s is teaching' %self.name) class Student(People): def __init__(self, name, age, year, mon, day,group): People.__init__(self,name,age,year,mon,day) self.group=group def study(self): print('%s is studying' %self.name) # t=Teacher(,,,) # print(t.name,t.age) # print(t.birth) # t.birth.tell_birth() # print(t.birth.year) # print(t.birth.mon) # print(t.birth.day) class Course: def __init__(self,name,price,period): self.name=name self.price=price self.period=period def tell_info(self): print('课程名<%s> 价钱<%s> 周期<%s>' %(self.name,self.price,self.period)) #===================================== # 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,birth): # self.name=name # self.age=age # self.birth=birth # # def teach(self): # print('%s is teaching' %self.name) # # t_birth=Date(,,) # t=Teacher(,t_birth)
组合
接口