def grouper(iterable, n, fillvalue=None):
      "Collect data into fixed-length chunks or blocks"
      # grouper('ABCDEFG', 3, 'x') --> ABC DEF Gxx"
      args = [iter(iterable)] * n
      return zip_longest(*args, fillvalue=fillvalue)

- Idiomatic way to take groups of n items from a list in Python? [2]

- Python “Every Other Element” Idiom [3]

- Iterate an iterator by chunks (of n) in Python? [4]

- How do you split a list into evenly sized chunks in Python? [5]

[1]: http://stackoverflow.com/questions/434287/what-is-the-most-p...

[2]: http://stackoverflow.com/questions/2461484/idiomatic-way-to-...

[3]: http://stackoverflow.com/questions/2631189/python-every-othe...

[4]: http://stackoverflow.com/questions/8991506/iterate-an-iterat...

[5]: http://stackoverflow.com/questions/312443/how-do-you-split-a...

[6]: http://docs.python.org/3/library/itertools.html#itertools-re...