Python - Extracting inner most lists

Question

Just started toying around with Python so please bear with me :)

Assume the following list which contains nested lists:

[[[[[1, 3, 4, 5]], [1, 3, 8]]         


        

Answer 1

Using itertools.chain.from_iterable:

from itertools import chain

def get_inner_lists(xs):
    if isinstance(xs[0], list): # OR all(isinstance(x, list) for x in xs)
        return chain.from_iterable(map(get_inner_lists, xs))
    return xs,

used isinstance(xs[0], list) instead of all(isinstance(x, list) for x in xs), because there's no mixed list / empty inner list.

---

>>> list(get_inner_lists([[[[[1, 3, 4, 5]], [1, 3, 8]], [[1, 7, 8]]], [[[6, 7, 8]]], [9]]))
[[1, 3, 4, 5], [1, 3, 8], [1, 7, 8], [6, 7, 8], [9]]