super 理解

Posted 2023-01-13

• super 解决了类继承时候，不同类的同名称方法继承问题
• 当执行下面代码的时候，代码会报错’Girl’ object has no attribute ‘height’，
• 两个类（Girl 和Person)有相同的方法名称，init 和about，当名称相同时候子类的方法会覆盖’父类’（这个父类的叫法有问题姑且这么叫）
• 在子类Girl中，__init__方法已经覆盖父类的方法，
• 当执行 E.about(‘Elisabeth’) ，这个about 是子类的about ,这个方法会用到height,但是这个功能在父类中的__init__的方法里面，不好意思被覆盖掉了，所以报错了

class Person:
    def __init__(self):
        self.height=180
    def about(self,name):
        print(from Person about++++ ,  is about .format(\\n,name,self.height))
        
class Girl(Person):
    def __init__(self):
        
        
        self.age=16
        
    def about(self,name):
        print(from Girl about +++++ ,  is a hot girl ,she is about ,and her age is .format(\\n,name,
    self.height,self.age))
        
    
    
if __name__==__main__:
    E=Girl()
    E.about(Elisabeth)

在子类Girl里面加上 super(Girl,self).init()，那么父类的__init__方法下移，子类的__init__方法继承了父类的功能

class Person:
    def __init__(self):
        self.height=180
    def about(self,name):
        print (from Person about++++ ,  is about .format(\\n,name,self.height))
        
class Girl(Person):
    def __init__(self):
        
        super(Girl,self).__init__()
        self.age=16
        
    def about(self,name):
        print(from Girl about +++++ ,  is a hot girl ,she is about ,and her age is .format(\\n,name,
    self.height,self.age))
        
    
    
if __name__==__main__:
    E=Girl()
    E.about(Elisabeth)

可以看出现在这个方法还是Girl 里面的，因为子类的同名方法覆盖父类的方法

from Girl about +++++
 , Elisabeth is a hot girl ,she is about 180,and her age is 16

加载父类中的about方法

class Person:
    def __init__(self):
        self.height=180
    def about(self,name):
        print(from Person about++++ ,  is about .format(\\n,name,self.height))
        
class Girl(Person):
    def __init__(self):
        
        super(Girl,self).__init__()
        self.age=16
        
    def about(self,name):
        
        super(Girl,self).about(name)
        print (from Girl about +++++ ,  is a hot girl ,she is about ,and her age is .format(\\n,name,
    self.height,self.age))
        
    
    
if __name__==__main__:
    E=Girl()
    E.about(Elisabeth)

from Person about++++
 , Elisabeth is about 180
from Girl about +++++
 , Elisabeth is a hot girl ,she is about 180,and her age is 16