#!/usr/bin/env python
# -*- coding: utf-8 -*-

import gc
import itertools

def grouper(iterable, chunksize):
	"""
	Return elements from the iterable in `chunksize`-ed lists. The last returned
	element may be smaller (if length of collection is not divisible by `chunksize`).

	>>> print list(grouper(xrange(10), 3))
	[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]
	"""
	i = iter(iterable)
	while True:
		chunk = list(itertools.islice(i, int(chunksize)))
		if not chunk:
			break
		yield chunk

########## Solution, comment out to test original
def grouper(iterable, chunksize):
	i = iter(iterable)
	while True:
		tmpr = [list(itertools.islice(i, int(chunksize)))]
		if not tmpr[0]:
			break
		yield tmpr.pop()

class ReportingFree(object):
	def __del__(self):
		print('Freed ' + str(id(self)))

def createObjects():
	while True:
		yield ReportingFree()

g = grouper(createObjects(), 3)

gc.collect()
print(gc.get_referrers(next(g)))
gc.collect()

# We're now after yield, but before the next iteration

print('Finished')