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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Classes
Date: Fri, 31 Oct 2014 18:57:31 -0400
Organization: IISS Elusive Unicorn
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On Fri, 31 Oct 2014 14:18:44 -0400, Seymore4Head
<Seymore4Head@Hotmail.invalid> declaimed the following:

>On Fri, 31 Oct 2014 10:43:19 -0700, Rob Gaddi
><rgaddi@technologyhighland.invalid> wrote:
>
>
>>Define a Square class, subclassed from Rectangle.  Use getters/setters
>>to enforce that the length and width must be equal.  Confirm that
>>length and width remain locked, and that perimeter() and area() work
>>correctly.
>
>class Rectangle:
>    def __init__(self,length,width):
>        self.length=length
>        self.width=width
>    def area(self):
>        return self.length*self.width
>    def perimeter(self):
>        return 2*self.length+2*self.width
>class Square(Rectangle):
>    def set_side (self):
>        if self.length!=self.width:
>           
	Where's the rest of that -- not to mention you called it "set_side" but
never pass a side into it for use.
 
-=-=-=-=-=-=-=-

class Rectangle(object):
    def __init__(self, length, width=None):
        self.length = length
        if width is None:
            self.width = length
        else:
            self.width = width
    def area(self):
        return self.length * self.width
    def perimeter(self):
        return 2 * (self.length + self.width)

class Square(Rectangle):
    def __init__(self, side):
        self.side = side
    def _getLength(self):
        return self.side
    def _getWidth(self):
        return self.side
    def _setLength(self, vlu):
        self.side = vlu
    def _setWidth(self, vlu):
        self.side = vlu
    length = property(_getLength, _setLength)
    width = property(_getWidth, _setWidth)

aRect = Rectangle(2, 4)
print aRect.length, aRect.width, aRect.area(), aRect.perimeter()
aRect.length = 9
print aRect.length, aRect.width, aRect.area(), aRect.perimeter()


aSqr = Square(3)
print aSqr.side, aSqr.length, aSqr.width, aSqr.area(), aSqr.perimeter()
aSqr.length = 4
print aSqr.side, aSqr.length, aSqr.width, aSqr.area(), aSqr.perimeter()
aSqr.width = 5
print aSqr.side, aSqr.length, aSqr.width, aSqr.area(), aSqr.perimeter()
aSqr.side = 7
print aSqr.side, aSqr.length, aSqr.width, aSqr.area(), aSqr.perimeter()

-=-=-=-=-=-=-=-=-
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\Wulfraed\Documents>cd "Python Progs"

C:\Users\Wulfraed\Documents\Python Progs>property2.py
2 4 8 12
9 4 36 26
3 3 3 9 12
4 4 4 16 16
5 5 5 25 20
7 7 7 49 28

C:\Users\Wulfraed\Documents\Python Progs>
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/