On Dec 27, 11:34 am, Kugutsumen <[EMAIL PROTECTED]> wrote:
> I am relatively new the python language and I am afraid to be missing
> some clever construct or built-in way equivalent to my 'chunk'
> generator below.
>
> def chunk(size, items):
> """generate N items from a generator."""
> chunk = []
> count = 0
> while True:
> try:
> item = items.next()
> count += 1
> except StopIteration:
> yield chunk
> break
> chunk.append(item)
> if not (count % size):
> yield chunk
> chunk = []
> count = 0
The itertools module is always a good place to look when you've got a
complicated generator.
import itertools
import operator
def chunk(N, items):
"Group items in chunks of N"
def clump((n, _)):
return n // N
for _, group in itertools.groupby(enumerate(items), clump):
yield itertools.imap(operator.itemgetter(1), group)
for ch in chunk(7, range(30)):
print list(ch)
I've changed chunk to return a generator rather than building a list
which is probably only going to be iterated over. But if you prefer
the list version, replace 'itertools.imap' with 'map'.
--
Paul Hankin
--
http://mail.python.org/mailman/listinfo/python-list
