dict.items() vs dict.iteritems and similar questions

[Leif K-Brooks]

Laurent Pointal wrote:
> Both work, you may prefer xrange/iteritems for iteration on large
> collections, you may prefer range/items when processing of the result
> value explicitly need a list (ex. calculate its length) or when you are
> going to manipulate the original container in the loop.

xrange actually supports len():

  >>> len(xrange(10))
  10