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Mastering the Art of Programming in Python 3

Solution Review: Devise a Shape

Understand how to create shape classes like Square and Rectangle using Python's object-oriented principles. Learn about constructors, instance and class variables, method types, and enforcing implementation via abstract classes. This lesson helps you apply idiomatic Python OOP techniques to design robust, reusable code.

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Explanation

Before jumping straight to the code, let’s proceed bit by bit.

To initialize a shape, whether a Square object or a Rectangle object, we need a constructor for initialization (__init__()) in both classes. Here’s the snippet:

For the Square class:

def __init__(self, l):
  self.length = l

Here, length is the instance variable. ...

For the Rectangle class:

def __init__(self, l, w):
  self.length = l
  self.width = w

Here, length and width are ...