python中rect函数_使用类和函数的面向对象Python-rectangle

我正在用Python创建一个程序，它将利用面向对象的编程来打印给定矩形的属性。该项目有以下限制：The purpose of this lab is to give you practice creating your own

object. You will be given a main function that expects an instance of

the (yet undefined) Rectangle object. Your job is to determine what

attributes and methods the Rectangle class requires and create a class

that will satisfy the requirements.Add only one feature at a time

You may need to comment out parts of the main function for testing

Constructor should take 0, 1, or 2 parameters (illustrating polymorphism)

Your class should be a subclass of something (illustrating inheritance)

Your class should have methods and properties (illustrating encapsulation)

Make your instance variables hidden (using the __ trick)

Add setter and getter methods for each instance variable

Use properties to encapsulate instance variable access

Not all instance variables are real... Some are derived, and should be write-only

You may not substantially change the main function (unless you're doing the blackbelt challenge)

Be sure to add the needed code to run the main function when needed

以下是评估准则代码：main()函数相对不变3

代码：矩形类是用默认值声明的，因此它支持0、1和2参数3

代码：实例化矩形(5,7)2

代码：实例化Rectangle()2

代码：矩形类定义实例变量2

代码：为每个实例变量2定义getter和setter

代码：矩形类包括面积和周长方法4

代码：矩形类继承自某个对象，即使它是对象2

代码：矩形类定义宽度和长度属性4

代码：矩形包含派生的只读实例变量2

代码：当python文件作为main 2执行时调用main

代码：矩形类定义了返回字符串4的getStats()方法

执行：打印矩形a:1

执行：打印区域：351

执行：打印周长：24 1

执行：打印矩形b:1

执行：打印宽度：101

执行：打印高度：201

执行：打印区域：200 1

执行：打印周长：60 1

40分

我得到这个代码的开始是：def main():

print "Rectangle a:"

a = Rectangle(5, 7)

print "area: %d" % a.area

print "perimeter: %d" % a.perimeter

print ""

print "Rectangle b:"

b = Rectangle()

b.width = 10

b.height = 20

print b.getStats()

我应该得到这个输出：Rectangle a:

area: 35

perimeter: 24

Rectangle b:

width: 10

height: 20

area: 200

perimeter: 60

我已经走了这么远，但是我不能用矩形B来打印宽度和高度？class Rectangle:

def __init__(self, width=0, height=0):

self.width = width

self.height = height

def area(self):

return self.width * self.height

def perimeter(self):

return 2 * self.height + 2 * self.width

def setWidth(self, width):

self.width = width

def setHeight(self, height):

self.height = height

def getStats(self):

return "area: %s\nperimeter: %s" % (self.area(), self.perimeter())

def main():

print ""

print "Rectangle a:"

a = Rectangle(5, 7)

print "area: %s" % a.area()

print "perimeter: %s" % a.perimeter()

print ""

print "Rectangle b:"

b = Rectangle()

b.width = 10

b.height = 20

print b.getStats()

print ""

main()

我正在获取此输出：Rectangle a:

area: 35

perimeter: 24

Rectangle b:

area: 200

perimeter: 60

Process finished with exit code 0