gistfile1.py

# -*- coding:utf-8 -*-
import sys

class Sample(object):
    def __init__(self, n):
        self.n = n

    def __iter__(self):
        for i in range(self.n):
            print(i)
            yield i

    def __len__(self):
        return self.n

def chunk(xs, n):
    xs = list(xs)
    for i in range(0,len(xs), n):
        yield(xs[i:i+n])

def chunk2(xs, n):
    itr = iter(xs)
    r = xrange(n)
    while True:
        yield [next(itr) for i in r]

itr = chunk(Sample(10), 2)
print("よくあるchunk")
print(next(itr))
print(next(itr))
print(next(itr))
print("-")
for e in itr:
    print(e)

print("@@@@@@@@@@")

itr = chunk2(Sample(10), 2)
print(next(itr))
print(next(itr))
print(next(itr))
print("-")
for e in itr:
    print(e)

よくあるchunk
0
1
2
3
4
5
6
7
8
9
[0, 1]
[2, 3]
[4, 5]
-
[6, 7]
[8, 9]
@@@@@@@@@@
0
1
[0, 1]
2
3
[2, 3]
4
5
[4, 5]
-
6
7
[6, 7]
8
9
[8, 9]