TypeError NoneType object has no attribute getitem

Question

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     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      The 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    Can you explain to me what that error means and why it is happening so I can fix it

User · Answer

move CompleteMove   does not return a value  perhaps it just prints something   Any method that does not return a value returns None  and you have assigned None to self values   Here is an example of this    gt  gt  gt  def hello x          print x 2      gt  gt  gt  hello  world   worldworld  gt  gt  gt  y   hello  world   worldworld  gt  gt  gt  y  gt  gt  gt    You ll note y doesn t print anything  because its None  the only value that doesn t print anything on the interactive prompt

User · Answer

BrenBarn is correct  The error means you tried to do something like None 5   In the backtrace  it says self imageDef self values 2   which means that your self values is None   You should go through all the functions that update self values and make sure you account for all the corner cases

User · Answer

The function move CompleteMove events  that you use within your class probably doesn t contain a return statement  So nothing is returned to self values      None   Use return in move CompleteMove events  to return whatever you want to store in self values and it should work  Hope this helps

[python] TypeError: 'NoneType' object has no attribute 'getitem'

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[python] TypeError: 'NoneType' object has no attribute 'getitem'