Qn 4) Using Python Programming Language only, write a Shape, a Circle, a Rectangle and a Square classes with the following requirements: Shape class: - has 2 private variables filled (boolean) & colour (string) - the filled & colour properties are set during initialization, if nothing is given, filled & colour defaults to True and 'Green' respectively - accessor methods for both variables - the Shape class must return a string representation following the format 'Shape[colour=, filled=]' when called from the print() function

Circle class: - is derived from the Shape class - has 1 additional private variable radius - its properties are set during initialization, if nothing is given, radius defaults to 1.0. - accessor methods for the radius variable - the Circle class must know how to calculate its own area and perimeter - the Circle class must return a string representation following the format 'Circle[Shape[filled=, colour=], radius=]' when called from the print() function - round all numbers to 2 decimal places

Rectangle class: - is derived from the Shape class - has 2 additional private variable width & length - its properties are set during initialization, if nothing is given, both width & length defaults to 1.0. - accessor methods for both the width & length variable - the Rectangle class must know how to calculate its own area and perimeter - the Circle class must return a string representation following the format 'Rectangle[Shape[filled=, colour=], width=, length=]' when called from the print() function - round all numbers to 2 decimal places

Square class: - is derived from the Rectangle class - has 1 additional private variable side - its properties are set during initialization, if nothing is given, side defaults to 1.0. - accessor methods for the side (Note that the accessor methods should set both the width & length of the parent class and get the value of either width or length from the parent class) - the Square class must return a string representation following the format 'Square[Rectangle[Shape[filled=, colour=], width=, length=]]' when called from the print() function - round all numbers to 2 decimal places

Sample Program Output: Circle[Shape[colour=Green, filled=True], radius=5] area=78.54 perimeter=31.42 Square[Rectangle[Shape[colour=Green, filled=True], width=5, length=5]] area=25 perimeter=20