Python__继承

Posted 2020-10-02

#继承的基本形式
# class ParentClass1(object): #定义父类
# pass
#
# class ParentClass2: #定义父类
# pass
#
# class SubClass1(ParentClass1): #单继承，基类是ParentClass1，派生类是SubClass
# pass
#
# class SubClass2(ParentClass1,ParentClass2): #python支持多继承，用逗号分隔开多个继承的类
# pass
#
#
#
#
# print(SubClass1.__bases__)
# print(SubClass2.__bases__)
# print(ParentClass1.__bases__)

#经典类与新式类的区别

 

# class Animal:
# x=1
# def __init__(self,name,age,sex):
# self.name=name
# self.age=age
# self.sex=sex
# # print(‘Animal.__init__‘)
# def eat(self):
# print(‘%s eat‘ %self.name)
#
# def talk(self):
# print(‘%s say‘ %self.name)
#
# class People(Animal):
# x=10
# def __init__(self,name,age,sex,education):
# Animal.__init__(self,name,age,sex)
# self.education=education
# # print(‘People.__init__‘)
#
# def talk(self):
# Animal.talk(self)
# print(‘这是人在说话‘)
#
# class Dog(Animal):
# pass
# class Pig(Animal):
# pass
#
#
# peo1=People(‘alex‘,18,‘male‘,‘小学肄业‘)
# print(peo1.__dict__)
# peo1.talk()
# print(peo1.x)

# dog1=Dog(‘yuanhao‘,28,‘male‘)
# pig1=Pig(‘wupeiqi‘,18,‘male‘)
#
#
# print(peo1.name)
# print(dog1.name)
# print(pig1.name)

 

class OldboyPeople:
school = ‘oldboy‘
def __init__(self,name,age,sex):
self.name=name
self.age=age
self.sex=sex

def eat(self):
print(‘is eating‘)

class OldboyStudent(OldboyPeople):
def learn(self):
print(‘%s is learning‘ %self.name)

class OldboyTeacher(OldboyPeople):
def __init__(self,name,age,sex,salary,title):
OldboyPeople.__init__(self,name,age,sex)
self.salary=salary
self.title=title

def teach(self):
print(‘%s is teaching‘ %self.name)

yl_obj=OldboyStudent(‘yanglei‘,28,‘female‘)
egon_obj=OldboyTeacher(‘egon‘,18,‘male‘,3.1,‘沙河霸道金牌讲师‘)

#
# yl_obj.learn()
# yl_obj.eat()

print(egon_obj.__dict__)

‘‘‘
总结：
1 继承的功能之一：解决类与类之间的代码重复问题
2 继承是类与类之间的关系，是一种，什么是什么的关系
3 在子类派生出的新的属性，已自己的为准
4 在子类派生出的新的方法内重用父类的功能的方式：指名道姓法
OldboyPeople.__init__
这种调用方式本身与继承是没有关系
‘‘‘