1. lst = [
    2.     [
    3.         [[], [2], [3]],
    4.         [[4], [5], [6]]
    5.     ],
    6.     [
    7.         [[1], [2], [3]],
    8.         [[4], [5], [6]]
    9.     ],
    10.     [
    11.         [[1], [2], [3]],
    12.         [[4], [5, 123], [6]]
    13.     ],
    14. ]
    17. # 方法一：sum
    18. def unpack_sum(lst):
    19.     while isinstance(lst[0], list):
    20.         lst = sum(lst, [])
    21.     return lst
    24. # 方法二：chain（官方推荐）
    25. def unpack_chain(lst):
    26.     from itertools import chain
    28.     while isinstance(lst[0], list):
    29.         lst = list(chain.from_iterable(lst))  # or return list(chain(*lst))
    30.     return lst
    33. pack1 = unpack_sum(lst)
    34. pack2 = unpack_chain(lst)
    36. print(pack1)
    37. print(pack2)