[Python]group操作

• 很妙

def group(lst, n):
    """group([0,3,4,10,2,3], 2) => [(0,3), (4,10), (2,3)]

    Group a list into consecutive n-tuples. Incomplete tuples are
    discarded e.g.

    >>> group(range(10), 3)
    [(0, 1, 2), (3, 4, 5), (6, 7, 8)]
    """
    return zip(*[lst[i::n] for i in range(n)])

• lst[i::n]的作用

lst = range(10)
n = 5
print(*[lst[i::n] for i in range(n)])
>> range(0, 10, 5) range(1, 10, 5) range(2, 10, 5) range(3, 10, 5) range(4, 10, 5)