更新

使用迭代器

def chunks(lst, n):
    """Yield successive n-sized chunks from lst."""
    for i in range(0, len(lst), n):
        yield lst[i:i + n]

  • 示例
    # Use xrange() instead of range() in python2
    ret = chunks(list(range(68)),21)
    print(list(ret))
    # 返回
    [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20],
     [21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41],
     [42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62], [63, 64, 65, 66, 67]]

    自己写的

import math

def split_list(alist, split_len):   # TODO: 是否有改进之处
    """
    按照每4个一组进行划分
    :param alist:
    :param split_len:
    :return:
    """
    b = []
    start_split_index = 0
    length = int(math.ceil(len(alist) / float(split_len)))
    while length > 0:
        a = []
        end_index = start_split_index + split_len
        for i in alist[start_split_index:end_index]:
            a.append(i)

        start_split_index += split_len

        length -= 1
        b.append(a)

    return b

网上看到的

def list_of_groups(init_list, children_list_len):
    list_of_group = zip(*(iter(init_list),) * children_list_len)
    end_list = [list(i) for i in list_of_group]
    count = len(init_list) % children_list_len
    end_list.append(init_list[-count:]) if count != 0 else end_list
    return end_list

CookBook


def slice_list(seq, size):
    return [seq[i:i + size] for i in range(0, len(seq), size)]
    
def zip_iter(seq, size): # TODO:没看懂，这个方法当 seq 太小时，会返回空；e.g.zip_iter(list(range(2)),4)
    return list(zip(*[iter(seq)] * size))

执行结果

if __name__ == '__main__':
    a = list(range(24))
    num = 4
    t1 = split_list(a, num)
    t2 = list_of_groups(a, num)
    t3 = slice_list(a, num)
    t4 = zip_iter(a, num)
    print(t1)
    print(t2)
    print(t3)
    print(t4)
# [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23]]
# [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23]]
# [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23]]
# [(0, 1, 2, 3), (4, 5, 6, 7), (8, 9, 10, 11), (12, 13, 14, 15), (16, 17, 18, 19), (20, 21, 22, 23)]

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