python 静态方法类方法属性方法详解

Posted 2020-12-16 anhao-world

‘‘‘
class Dog(object):

    def __init__(self,name):
        self.name = name

    @staticmethod#实际上跟类没有什么关系了。eat和类的关系截断了，只是类下面函数
    #静态方法：只是名义上归类管理，实际上在静态方法里访问不了类或实例中的任何属性
    def eat(self):
        print(‘%s  is eating %s‘%(self.name,‘dd‘))

d = Dog(‘test‘)
d.eat(d)


#类方法：只能访问类变量，不能访问实例变量
class Dog(object):
    name =‘testing‘
    def __init__(self,name):
        self.name = name

    @classmethod
    def eat(self):
        print(‘%s  is eating %s‘%(self.name,‘dd‘))

d = Dog(‘test‘)
d.eat()
‘‘‘
#属性方法:把一个方法变成一个静态属性

class Dog(object):
    name =‘testing‘
    def __init__(self,name):
        self.name = name
        self.__food = None

    @property
    def eat(self):
        print(‘%s  is eating %s‘%(self.name,self.__food))
    @eat.setter
    def eat(self,food):
        print("set to food:",food)
        self.__food = food#赋值

    @eat.deleter
    def eat(self):
        del self.__food
        print(‘删除了‘)
d = Dog(‘test‘)
d.eat
d.eat = "包子"
d.eat

del d.eat#无法通过del删除属性