November 2015
Beginner to intermediate
340 pages
7h 29m
English
We will start by building a screen saver. The program will consist of several random-colored and random-sized balls bouncing all over the screen at random velocity, as shown in the following screenshot:

Let's create a class to generate balls with random attributes. Accordingly, we define a new class named RandomBall. 7.01_screensaver.py:
class RandomBall:
def __init__(self, canvas):
self.canvas = canvas
self.screen_width = canvas.winfo_screenwidth()
self.screen_height = canvas.winfo_screenheight()
self.create_ball()
def create_ball(self): self.generate_random_attributes() self.create_oval() def generate_random_attributes(self): ...