title: TypeError: 'NoneType' object has no attribute '__getitem__'
body: <p>I'm having an issue and I have no idea why this is happening and how to fix it. I'm working on developing a Videogame with python and pygame and I'm getting this error: </p>
  
  <pre><code> File "/home/matt/Smoking-Games/sg-project00/project00/GameModel.py", line 15, in Update 
     self.imageDef=self.values[2]
  TypeError: 'NoneType' object has no attribute '__getitem__'
  </code></pre>
  
  <p>The code:</p>
  
  <pre><code>import pygame,components
  from pygame.locals import *
  
  class Player(components.Entity):
  
      def __init__(self,images):
          components.Entity.__init__(self,images)
          self.values=[]
  
      def Update(self,events,background):
          move=components.MoveFunctions()
          self.values=move.CompleteMove(events)
          self.imageDef=self.values[2]
          self.isMoving=self.values[3]
  
      def Animation(self,time):
          if(self.isMoving and time==1):
              self.pos+=1
              if (self.pos&gt;(len(self.anim[self.imageDef])-1)):
                  self.pos=0
          self.image=self.anim[self.imageDef][self.pos]
  </code></pre>
  
  <p>Can you explain to me what that error means and why it is happening so I can fix it?</p>