title: pygame.Rect around circle
body: <p>I'm trying to make a pong game in pygame , but i can't figure out how to but a ball circle , which i can create with pygame.draw.circle into a pygame.Rect object so i can use the colliderect function and manipulate the ball's position. 
  For example, with rectangles, i can do something like this :</p>
  
  <pre><code>rect = pygame.Rect(255, 255, 100, 100)
  pygame.draw.rect(screen, yellow, rect)
  </code></pre>
  
  <p>and then when i change the pygame.Rect object position , the drawing primitives position also changes. How can the same effect be achieved when i want to draw a circle, instead of a rectangle?
  Thank you.</p>