title: How to create a border in Pygame
body: <p>I would like to know how to create a border in Pygame to stop the user controlled object from exiting the screen. Right now, I only have it so python prints some text when the user controlled object has come near one of the 4 sides.</p>
  
  <p>Here is my code so far.</p>
  
  <pre><code>import pygame
  from pygame.locals import *
  pygame.init()
  
  #Display Stuff 
  screenx = 1000
  screeny = 900
  screen = pygame.display.set_mode((screenx,screeny))
  pygame.display.set_caption('Block Runner')
  clock = pygame.time.Clock()
  image = pygame.image.load('square.png')
  
  
  
  
  #Color Stuff
  red = (255,0,0)
  green = (0,255,0)
  blue = (0,0,255)
  white = (255,255,255)
  black = (0,0,0)
  
  
  #Variables
  x_blocky = 50
  y_blocky = 750
  blocky_y_move = 0
  blocky_x_move = 0
  
  
  
  #Animations
  def Blocky(x_blocky, y_blocky, image):
  screen.blit(image,(x_blocky,y_blocky))
  
  #Game Loop
  
  game_over = False
  while not game_over:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              pygame.quit()
              quit()
  
          if event.type == pygame.KEYDOWN:
              if event.key == pygame.K_UP:
                  blocky_y_move = -3
          if event.type == pygame.KEYUP:
              if event.key == pygame.K_UP:
                  blocky_y_move = 0
  
          if event.type == pygame.KEYDOWN:
              if event.key == pygame.K_DOWN:
                  blocky_y_move = 3
          if event.type == pygame.KEYUP:
              if event.key == pygame.K_DOWN:
                  blocky_y_move = 0
  
          if event.type == pygame.KEYDOWN:
              if event.key == pygame.K_RIGHT:
                  blocky_x_move = 3
          if event.type == pygame.KEYUP:
              if event.key == pygame.K_RIGHT:
                  blocky_x_move = 0
  
          if event.type == pygame.KEYDOWN:
              if event.key == pygame.K_LEFT:
                  blocky_x_move = -3
          if event.type == pygame.KEYUP:
              if event.key == pygame.K_LEFT:
                  blocky_x_move = 0
  
          if x_blocky &gt; 870 or x_blocky &lt; 0:
              print(' X Border')
  
  
          if y_blocky &gt; 750 or y_blocky &lt; 2:
              print(' Y Border')
  
  
  
      y_blocky += blocky_y_move
      x_blocky += blocky_x_move
  
  
      screen.fill(white)
      Blocky(x_blocky, y_blocky, image)
      pygame.display.update()
  clock.tick(60)
  </code></pre>