<s>[INST] import pygame
import sys
import os

# Initialize Pygame
pygame.init()

# Set up some constants
WIDTH = 800
HEIGHT = 600
TITLE = "My Window"
BACKGROUND_COLOR = (255, 255, 255)

# Set up the display
window = pygame.display.set_mode((WIDTH, HEIGHT))

# Set up the title of the window
pygame.display.set_caption(TITLE)

# Set up the font
font = pygame.font.Font(None, 36)

# Set up the color of the text
text_color = (0, 0, 0)

# Set up the text
text = "Hello, world!"

# Set up the text surface
text_surface = font.render(text, True, text_color)

# Set up the rectangle of the text surface
text_rect = text_surface.get_rect()

# Position the rectangle
text_rect.center = (WIDTH // 2, HEIGHT // 2)

# Draw the background
window.fill(BACKGROUND_COLOR)

# Draw the text
window.blit(text_surface, text_rect)

# Update the display
pygame.display.update()

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

What does this code do?[/INST]