Magic Methods, Operator Overloads, and Union Types

0: Setup

For this challenge question, you’re going to modify the Point and Line classes we wrote together in class to add more functionality! This will mean modifying the point.py and line.py files inside CQs/cq04, so make sure you’ve set up those files correctly according to the instructions from class!

1: Point#__str__

First, you are going to write a __str__ magic method to return Points in a readable way! It should return

(<x value>, <y value>)

where <x value> and <y value> are the x and y attributes of the Point, respectively.

Example Usage

$ python 
>>> from CQs.cq04.point import Point
>>> my_point: Point = Point(1.0, 2.0)
>>> print(str(my_point))
(1.0, 2.0)

2: Point#__mul__

Now, you are going to add a __mul__ method to overload the multiplication * operator!

The goal is that when multiplying a Point object with a factor: int, it should create a new Point where both the x and y attributes should be the previous points attributes multiplied by factor.

Example Usage:

$ python 
>>> from CQs.cq04.point import Point
>>> my_point: Point = Point(1.0, 2.0)
>>> new_point: Point = my_point * 3
>>> print(new_point)
(3.0, 6.0)

3: Line#__str__

Now that we have a way to visualize Point objects, you can use the str interpretation of Points to visualize a line!

It should return

(<p1> <-> <p2>)

where <p1> and <p2> are the p1 and p2 attributes of the Line, respectively.

(Note that you should NOT need to manually access the x and y attributes of each Point to print them! You should be able to just convert the points to a string using the __str__ magic method you defined in Part 1.)

Example Usage:

$ python 
>>> from CQs.cq04.line import Line
>>> from CQs.cq04.point import Point
>>> point_1: Point = Point(1.0, 2.0)
>>> point_2: Point = Point(3.0, 4.0)
>>> my_line: Line = Line(point_1, point_2)
>>> print(str(my_line))
(1.0, 2.0) <-> (3.0, 4.0)

4: Line#__mul__

Now, you are going to add a __mul__ method to Line to overload the multiplication * operator!

The goal is that when multiplying a Line object with a factor: int, it should create a new Line where both the p1 and p2 attributes should be the previous Line’s attributes multiplied by factor.

(Note that you should NOT need to manually access the x and y attributes of each Point to print them! You should be able to just multiply the points by factor using the __mul__ magic method you defined in Part 2.)

Example Usage:

$ python 
>>> from CQs.cq04.line import Line
>>> from CQs.cq04.point import Point
>>> point_1: Point = Point(1.0, 2.0)
>>> point_2: Point = Point(3.0, 4.0)
>>> my_line: Line = Line(point_1, point_2)
>>> new_line: Line = my_line * 2
>>> print(str(new_line))
(2.0, 4.0) <-> (6.0, 8.0)

5: Submission

Create your submission with the following command:

python -m tools.submission CQs/cq04