[Python-ideas] itertools.chunks(iterable, size, fill=None)

[anatoly techtonik]

I've run into the necessity of implementing chunks() again. Here is
the code I've made from scratch.

def chunks(seq, size):
  '''Cut sequence into chunks of given size. If `seq` length is
     not divisible by `size` without reminder, last chunk will
     have length less than size.

     >>> list( chunks([1,2,3,4,5,6,7], 3) )
     [[1, 2, 3], [4, 5, 6], [7]]
  '''
  endlen = len(seq)//size
  for i in range(endlen):
    yield [seq[i*size+n] for n in range(size)]
  if len(seq) % size:
    yield seq[endlen*size:]

--
anatoly t.


On Fri, Jun 29, 2012 at 11:32 PM, Georg Brandl <g.brandl at gmx.net> wrote:
> On 26.06.2012 10:03, anatoly techtonik wrote:
>>
>> Now that Python 3 is all about iterators (which is a user killer
>> feature for Python according to StackOverflow -
>> http://stackoverflow.com/questions/tagged/python) would it be nice to
>> introduce more first class functions to work with them? One function
>> to be exact to split string into chunks.
>>
>>      itertools.chunks(iterable, size, fill=None)
>>
>> Which is the 33th most voted Python question on SO -
>>
>> http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks-in-python/312464
>>
>> P.S. CC'ing to python-dev@ to notify about the thread in python-ideas.
>>
>
> Anatoly, so far there were no negative votes -- would you care to go
> another step and propose a patch?
>
>
> Georg
>
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