Break a list into 'n' pieces. The last list may be larger than the rest if the list doesn't break cleanly.

partition.py

#!/usr/bin/python

def partition(thelist, n):
  try:
    n = int(n)
    list(thelist)
  except (ValueError, TypeError):
    return [thelist]
  p = len(thelist) / n
  return [thelist[p*i:p*(i+1)] for i in range(n - 1)] + [thelist[p*(i+1):]]