python学习笔记之property

# property

# 内置装饰器函数 只在面向对象中使用
from math import pi
class Circle:
    def __init__(self,r):
        self.r = r
    @property
    def perimeter(self):
        return 2*pi*self.r
    @property
    def area(self):
        return self.r**2*pi

c1 = Circle(5)
print(c1.area)     # 圆的面积
print(c1.perimeter) # 圆的周长

class Person:
    def __init__(self,name,high,weight):
        self.name = name
        self.high = high
        self.weight = weight
    @property
    def bmi(self):
        return self.weight / self.high**2

jin = Person('金老板',1.6,90)
jin.bmi = 18
classmethod
staticmethod

class Person:
    def __init__(self,name):
        self.__name = name
    @property
    def name(self):
        return self.__name + 'sb'
    @name.setter
    def name(self,new_name):
        self.__name = new_name

tiger = Person('泰哥')
print(tiger.name)
tiger.name = '全班'
print(tiger.name)

class Goods:
    discount = 0.8
    def __init__(self,name,price):
        self.name = name
        self.__price = price
    @property
    def price(self):
        return self.__price * Goods.discount
apple = Goods('苹果',5)
print(apple.price)

# 属性 查看 修改 删除
class Person:
    def __init__(self,name):
        self.__name = name
        self.price = 20
    @property
    def name(self):
        return self.__name
    @name.deleter
    def name(self):
        del self.__name
    @name.setter
    def name(self,new_name):
        self.__name = new_name
brother2 = Person('二哥')
del Person.price
brother2.name = 'newName'
brother2
del brother2.name
print(brother2.name)

# 内置装饰器函数 只在面向对象中使用
from math import pi
class Circle:
    def __init__(self,r):
        self.r = r
    @property
    def perimeter(self):
        return 2*pi*self.r
    @property
    def area(self):
        return self.r**2*pi

c1 = Circle(5)
print(c1.area)     # 圆的面积
print(c1.perimeter) # 圆的周长

class Person:
    def __init__(self,name,high,weight):
        self.name = name
        self.high = high
        self.weight = weight
    @property
    def bmi(self):
        return self.weight / self.high**2

jin = Person('金老板',1.6,90)
jin.bmi = 18
classmethod
staticmethod

class Person:
    def __init__(self,name):
        self.__name = name
    @property
    def name(self):
        return self.__name + 'sb'
    @name.setter
    def name(self,new_name):
        self.__name = new_name

tiger = Person('泰哥')
print(tiger.name)
tiger.name = '全班'
print(tiger.name)

class Goods:
    discount = 0.8
    def __init__(self,name,price):
        self.name = name
        self.__price = price
    @property
    def price(self):
        return self.__price * Goods.discount
apple = Goods('苹果',5)
print(apple.price)

# 属性 查看 修改 删除
class Person:
    def __init__(self,name):
        self.__name = name
        self.price = 20
    @property
    def name(self):
        return self.__name
    @name.deleter
    def name(self):
        del self.__name
    @name.setter
    def name(self,new_name):
        self.__name = new_name
brother2 = Person('二哥')
del Person.price
brother2.name = 'newName'
brother2
del brother2.name
print(brother2.name)