title: Python NameError: name 'width' is not defined
body: <p>This is my code for creating a game. When I try to run this it keeps saying name "width" is 
  not defined. I am new to this so please make it simple while answering my question. Thanks :)</p>
  
  <pre><code># 1 - Import library
  import pygame
  from pygame.locals import *
  
  # 2 - Initialize the game
  pygame.init()
  width, height - 640, 480
  screen-pygame.display.set_mode((width, height))
  
  # 3 - Load Images
  player - pygame.images.load("resources/images/dude.png")
  
  # 4 - keep looping through
  while 1:
      # 5 - clear the screen before drawing it again
      screen.fill(0)
      # 6 - draw the screen elements
      screen.blit(player, (100,100))
      # 7 - update the screen
      pygame.display.flip()
      # 8 - loop through the events
      for event in pygame.event.get():
          # check if the event is the X button
          if event.type--pygame.QUIT:
              # if it is quit the game
              pygame.quit()
              exit(0)
  </code></pre>