title: add/remove items in a list
body: <p>I'm trying to create a player who can add and remove items from their inventory. I have everything working, I just have 1 small problem. Every time it prints the inventory, 'None' also appears. I've been messing with it to try and remove that, but no matter what I do, 'None' always appears in the program! I know I'm just missing something simple, but I can't figure it out for the life of me.  </p>
  
  <pre><code>class Player(object):
  
    def __init__(self, name, max_items, items):
      self.name=name
      self.max_items=max_items
      self.items=items
  
    def inventory(self):
      for item in self.items:
          print item
  
    def take(self, new_item):
      if len(self.items)&lt;self.max_items:
          self.items.append(new_item)
      else:
          print "You can't carry any more items!"
  
    def drop(self, old_item):
      if old_item in self.items:
          self.items.remove(old_item)
      else:
          print "You don't have that item."
  
  
  def main():
    player=Player("Jimmy", 5, ['sword', 'shield', 'ax'])
    print "Max items:", player.max_items
    print "Inventory:", player.inventory()
  
    choice=None
    while choice!="0":
      print \
      """
      Inventory Man
  
      0 - Quit
      1 - Add an item to inventory
      2 - Remove an item from inventory
      """
  
      choice=raw_input("Choice: ")
      print
  
      if choice=="0":
          print "Good-bye."
  
      elif choice=="1":
          new_item=raw_input("What item would you like to add to your inventory?")
          player.take(new_item)
          print "Inventory:", player.inventory()
  
      elif choice=="2":
          old_item=raw_input("What item would you like to remove from your inventory?")
          player.drop(old_item)
          print "Inventory:", player.inventory()
  
  
      else:
          print "\nSorry, but", choice, "isn't a valid choice."
  
  main()
  
  raw_input("Press enter to exit.")
  </code></pre>