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```"""
Sample Python/Pygame Programs
Simpson College Computer Science
http://simpson.edu/computer-science/

Explanation video: http://youtu.be/_XdrKSDmzqA

"""

# Import a library of functions called 'pygame'
import pygame

def draw_snowman(screen, x, y):
""" --- Function for a snowman ---
Define a function that will draw a snowman at a certain location.
"""
pygame.draw.ellipse(screen, WHITE, [35 + x, 0 + y, 25, 25])
pygame.draw.ellipse(screen, WHITE, [23 + x, 20 + y, 50, 50])
pygame.draw.ellipse(screen, WHITE, [0 + x, 65 + y, 100, 100])

# Initialize the game engine
pygame.init()

# Define the colors we will use in RGB format
BLACK = [0, 0, 0]
WHITE = [255, 255, 255]

# Set the height and width of the screen
size = [400, 500]
screen = pygame.display.set_mode(size)

# Loop until the user clicks the close button.
done = False
clock = pygame.time.Clock()

while not done:

for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True

# Clear the screen and set the screen background
screen.fill(BLACK)

# Snowman in upper left
draw_snowman(screen, 10, 10)

# Snowman in upper right
draw_snowman(screen, 300, 10)

# Snowman in lower left
draw_snowman(screen, 10, 300)

# Go ahead and update the screen with what we've drawn.
# This MUST happen after all the other drawing commands.
pygame.display.flip()

# This limits the while loop to a max of 60 times per second.
# Leave this out and we will use all CPU we can.
clock.tick(60)

# Be IDLE friendly
pygame.quit()

```
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