title: list assignment index out of range for 2d array error
body: <p>I looked into answers regarding similar questions but couldn't figure out my problem. I am newbie to python please help.</p>
  
  <pre><code>length = 13
  breadth = 24
  sheet = [ [ 0 for y in range( length ) ] for x in range( breadth ) ]
  sheet[length-2][breadth-3] = 1
  </code></pre>
  
  <p>The above code gives me list assignment index out of range error.</p>