There are a lot of pygame tutorials out there, but I haven't yet found a simple, step-by-step how-to on how to just get pygame installed on a Mac, and then actually use it. So, hopefully, this will work for you. This example was done using Macs running OS X 10.10 (Yosemite). Your mileage may vary.
Go to the pygame downloads page and scroll down to the Mac section.
Find the download titled Lion apple supplied python: pygame-1.9.2pre-py2.7-macosx10.7.mpkg.zip and download and install it.
It says Lion, but it will work with Yosemite.
Creating a short sample pygame
Just so you can see how it works basically (and then later on, you can create/tweak your own games), here's one you can start with.
Open up a text editor (e.g., a terminal editor like nano or a graphical one like TextWrangler—avoid TextEdit, unless you know the difference between plain text and rich text).
Paste into the text editor the following:
import sys, pygame pygame.init() size = width, height = 320, 240 speed = [2, 2] black = 0, 0, 0 screen = pygame.display.set_mode(size) ball = pygame.image.load("ball.gif") ballrect = ball.get_rect() while 1: for event in pygame.event.get(): if event.type == pygame.QUIT: sys.exit() ballrect = ballrect.move(speed) if ballrect.left < 0 or ballrect.right > width: speed = -speed if ballrect.top < 0 or ballrect.bottom > height: speed = -speed screen.fill(black) screen.blit(ball, ballrect) pygame.display.flip()
Then, save this beach ball image file to your desktop as well.
In Terminal.app (which you can find in /Applications/Utilities or using Spotlight), paste in this command:
Paste this command in next to run your script:
Credit where credit's due
I didn't make up this tutorial out of thin air. This is a synthesis of a couple of online resources I found.