title: Draw a Line in Pygame
body: <p>I want to draw a line in Python, but when I run the code below, this line never appears. In fact, I need to make a field with 4x4 sections, but let's begin with a line.
  My code:</p>
  <pre><code>import sys, pygame
  from pygame.locals import*
  
  width = 1000
  height = 500
  screen_color = (49, 150, 100)
  line_color = (255, 0, 0)
  
  def main():
      screen=pygame.display.set_mode((width,height))
      screen.fill(screen_color)
      pygame.display.flip()
      pygame.draw.line(screen,line_color, (60, 80), (130, 100))
  
      while True:
          for events in pygame.event.get():
              if events.type == QUIT:
                  sys.exit(0)
  main()
  </code></pre>
  <p>What's wrong?</p>