title: Python List Indexing Efficiency
body: <p>Quick question about the built in python list object.  Say you have a list with the numbers 0 - 99.  You are writing a program that takes the last item in the list and uses it for some other purpose.  Is it more efficient to use list[-1] than to use list[99]?  In other words, does python iterate through the whole list in either case?  </p>
  
  <p>Thanks for your help.</p>