week3.1 装饰器_以下代码为简单装饰器的应用,计算面积和周长-优快云博客

本文介绍了使用Python实现矩形和圆形类的过程，包括初始化、属性的获取与设置、计算面积与周长等功能，并展示了如何通过继承扩展功能，实现学生类，支持学习课程和观看活动。

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矩形

class Jx(object):
    def __init__(self,length,width):
        self._length=length
        self._width=width

    @property
    def length(self):
        return self._length
    @length.setter
    def length(self,length):
        self._length=length if length>0 else 0

    @property
    def width(self):
        return self._width
    @width.setter
    def widrh(self,width):
        self._width=width if width>0 else 0

    def area(self):
        return self._width*self._length

    def premier(self):
        return (self._length+self._width)*2

def main():
    jx1=Jx(12,15)
    jx2=Jx(10,8)
    print("矩形1的周长是：%d"%jx1.premier())
    print("矩形1的面积是：%d"%jx1.area())
    print("矩形2的周长是：%d"%jx2.premier())
    print("矩形2的面积是：%d"%jx2.area())
if __name__ == '__main__':
    main()

self.length,加表示不能访问，如需访问需要装饰器@property 访问、@setter 修改。

圆

from math import pi
class Circle(object):
    def __init__(self,radius):
        self._radius=radius

    @property
    def radinus(self):
        return self._radius
    @radinus.setter
    def radius(self,radius):
        self._radius=radius if radius>0 else 0

    def area(self):
        return pi*self._radius**2

    def premier(self):
        return 2*pi*self._radius

def main():
    circle1=Circle(5)
    circle2=Circle(3.5)
    print(circle1.area())
    print(circle1.premier())
    print(circle2.premier())
    print(circle2.area())

if __name__ == '__main__':
    main()

子类继承父类

class Person(object):
    def __init__(self,name,age):
        self._name=name
        self._age=age

    @property
    def name(self):
        return self._name

    @property
    def age(self):
        return  self._age
    @age.setter
    def age(self,age):
        self._age=age if age>0 else 0

class Stu(Person):
    def __init__(self,num,name,age):
        super().__init__(name,age)
        self._num=num
    @property
    def num(self):
        return self._num
    @num.setter
    def num(self,num):
        self._num=num

    def study(self,course):
        print("%s 在学习%s"%(self._name,course))

    def watch_av(self):
        if self._age>18:
            print("%s,%d岁了，在看av"%(self._name,self._age))
        else:
            print("%s,%d岁了，应该看《熊出没》"%(self._name,self._age))

def main():
    stu12=Stu(20180123,"王大锤",19)
    stu14=Stu(201709865,"翠花",4)
    stu14.study("python and politics")
    print(stu14.study)
    print(stu12.watch_av())
    print(stu14.watch_av())
if __name__ == '__main__':
    main()