My re-creation of the classic Pong game but (super simple) with the Pygame module (https://www.pygame.org/wiki/GettingStarted#Pygame%20Installation).
Going for the retro look, the paddles and puck have coloured outlines, no fill. This can be adjusted with self.borderwidth from PyPong under PyPong.py where 0=fill, 1>= is the thickness (integer).
This version has bugs but has many different iterations of failed collision detection and resolving, commented out.
This version uses zones around the puck to determine impending collisions and then only enact them; this prevents the order of if statements to affect the puck's motion. Additionally, a form of spin is included in this version. If a paddle is moving when the puck collides with it then vector addition is at play.
Puck's motion is acquired through x_vel and y_vel members, which allows for simple reflections; flip the vector component (x or y) by multiplying by -1.