python中@property和property函數使用

1、基本的@property使用，可以把函數當做屬性用

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):
        #原價
        self.original_price = 100
        #折扣
        self.discount = 0.8
 
    @property
    def price(self):
        #實際價格=原價*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函數使用

class Foo(object):
    def get_name(self):
        print('get_name')
        return 'laowang'
 
    def set_name(self, value):
        '''必須兩個參數'''
        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    #調用get方法
obj.NAME = 'alex'   #調用set方法
desc = Foo.NAME.__doc__     #調用第四個描述
print(desc)
del obj.NAME    #調用第三個刪除方法

5、property函數操作私有屬性的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))