Pygame barebones template

pygame_template.py

import pygame, sys
from pygame.locals import *

pygame.init()
DISPLAYSURF = pygame.display.set_mode((400, 300))
pygame.display.set_caption('Hello World!')

while True: # main game loop
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
    pygame.display.update()

This will crash some computers (including mine)! You must limit the frame rate as such:

import time
import datetime

fps_target = 30 # Frames per second  
spf_target = float(1) / fps_target # Seconds per frame  

while (True):  
	global spf_target	
  
	# Log initial time  
	t0 = datetime.datetime.now()

	# Check for events
	for event in pygame.event.get():
	     if event.type == pygame.QUIT:
	          sys.exit()

	# All update logic goes here	 
 
	# Log time after update logic
	t1 = datetime.datetime.now()

	# Calculate elapsed (delta) time
	tDelta = t1 - t0

	# Delay if necessary to meet target fps
	if (spf_target > tDelta.total_seconds()):
	     time.sleep(spf_target - tDelta.total_seconds())
 
	# All draw logic goes here

	pygame.display.flip()

Alternatively, just sleep for about 15 milliseconds each frame.
time.sleep(float(15) / 1000)

Also, you could replace
pygame.display.update()
with
pygame.display.flip()
unless you don't plan to update the whole screen.

http://stackoverflow.com/questions/29314987/difference-between-pygame-display-update-and-pygame-display-flip