title: How can I add objects every three seconds?
body: <p>In the current version of the code, falling objects are added at each iteration of the main loop. I was trying to add falling objects every three seconds. I was trying to do it with time.sleep() but it didn't worked because I lost the ability to move.
  When it did not work I tried to add the addObject () function in a few places, but soon I found out that nothing would change. How can I do this?. This is my code:</p>
  
  <pre><code>import pygame,random,sys
  from pygame.locals import *
  pygame.init()
  blue = (0,0,255)
  white = (255,255,255)
  red = (255,0,0)
  Clock = pygame.time.Clock()
  width = 300
  height = 500
  player = pygame.Rect(0,480,20,20)
  windowSurface = pygame.display.set_mode((300,500),0 ,32)
  moveLeft = False
  moveRight = False
  moveSpeed = 6
  fallingObjects = []
  fallingObjectsPositionX = []
  fallingObjectsPositionY = []
  x = 0   
  def addObject(x):
      for i in range(x):
          if len(fallingObjects) &lt; 10:
              fallingObjectsPositionX.append(random.randint(0,width - 20))
              fallingObjectsPositionY.append(0)
              fallingObjects.append((pygame.Rect(fallingObjectsPositionX[len(fallingObjectsPositionX) - 1],fallingObjectsPositionY[len(fallingObjectsPositionY) - 1],20,20))) 
  addObject(1)
  while x == 0:
      for event in pygame.event.get():
          if event.type == QUIT:
              pygame.quit()
              sys.exit()
          if event.type == KEYDOWN:
              if event.key == K_LEFT:
                  moveRight = False
                  moveLeft = True
              if event.key == K_RIGHT:
                  moveLeft = False
                  moveRight = True
          if event.type == KEYUP:
              if event.key == K_LEFT:
                  moveLeft = False
              if event.key == K_RIGHT:
                  moveRight = False
      windowSurface.fill(white)
      if moveLeft and player.left &gt; 0:
          player.left -= moveSpeed
      if moveRight and player.right &lt; width:
          player.right += moveSpeed
      pygame.draw.rect(windowSurface,blue,player)
      for i in fallingObjects[:]:
          if player.colliderect(i):
              x = 1
      for i in range(len(fallingObjects)):
          fallingObjectsPositionY[i] += 5
          fallingObjects[i] = pygame.Rect(fallingObjectsPositionX[i],fallingObjectsPositionY[i],20,20)
          pygame.draw.rect(windowSurface,red,fallingObjects[i])
      for i in range(len(fallingObjects)):
          if fallingObjectsPositionY[i] &gt;= height:
              del fallingObjects[i]
              del fallingObjectsPositionX[i]
              del fallingObjectsPositionY[i]
              for i in range(5):
                  addObject(1)
          if IndexError:
              break
      pygame.display.update()
      Clock.tick(40)
  </code></pre>