[0, 1, 2, 3, 4, 5] => [[0, 1], [2, 3], [4, 5]]

chunker.py

chunker1 = lambda xs: zip(xs[:-1:2], xs[1::2])

chunker2 = lambda xs: [xs[i:i+2] for i in range(0,len(xs),2)]

def chunker3(xs):
    i = 0
    while xs[i:i+2]:
        yield xs[i:i+2]
        i += 2

def chunker4(xs):
    t = xs[::-1]
    while t:
        a = t.pop()
        b = t.pop()
        yield a, b

chunker5 = lambda xs: (lambda xs, size: zip(*tuple(xs[i::size] for i in range(size))))(xs, 2)

要素数が奇数の場合の挙動が、それぞれ若干違う

これ素晴らしい https://gist.github.com/knzm/6133057