python中@property和property函数使用

1、基本的@property使用，可以把函数当做属性用

class Person(object):
    @property
    def get_name(self):
        print('我叫xxx')

def main():
    person = Person()
    person.get_name

if __name__ == '__main__':
    main()

2、@property的set，deleter，get

class Goods(object):
    @property
    def price(self):
        print('@property')

    @price.setter
    def price(self,value):
        print('@price.setter:'+str(value))

    @price.deleter
    def price(self):
        print('@price.deleter')

obj = Goods()
obj.price = 50
obj.price
del obj.price

3、@property demo

class Goods(object):
    def __init__(self):
        #原价
        self.original_price = 100
        #折扣
        self.discount = 0.8

    @property
    def price(self):
        #实际价格=原价*折扣
        new_price = self.original_price*self.discount
        return new_price
    @price.setter
    def price(self,value):
        self.original_price = value
    @price.deleter
    def price(self):
        del self.original_price
obj = Goods()
obj.price
obj.price = 200
del obj.price

4、property函数使用

class Foo(object):
    def get_name(self):
        print('get_name')
        return 'laowang'

    def set_name(self, value):
        '''必须两个参数'''
        print('set_name')
        return 'set value' + value

    def del_name(self):
        print('del_name')
        return 'laowang'

    NAME = property(get_name, set_name, del_name, 'description.')

obj = Foo()
obj.NAME    #调用get方法
obj.NAME = 'alex'   #调用set方法
desc = Foo.NAME.__doc__     #调用第四个描述
print(desc)
del obj.NAME    #调用第三个删除方法

5、property函数操作私有属性的get和set方法

class Person(object):
    def __init__(self, age):
        self.__age = age

    def set_age(self, value):
        self.__age = value

    def get_age(self):
        return self.__age

    AGE = property(get_age, set_age)

person = Person(15)
person.AGE = 20
print(str(person.AGE))