How to unpack a nested list in python to sublists? -

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assume list is:

[ [1,2,3,4], [ [[5], [6]], [7] ]]

after unpack, want [1,2,3,4], [5], [6], [7]

how low time complexity?

the linked duplicate flattens iterable completely. need slight tweak make process stop 1 step earlier:

import collections def flattish(l):     el in l:         if isinstance(el, collections.iterable) , not isinstance(el, str):             if any(isinstance(e, collections.iterable) e in el):                 sub in flattish(el):                     yield sub             else:                     yield el         else:             yield [el]

the any(... check if iterable contains iterables. flatten [1, [2, 3]], leave [5] as-is. additionally, yield [el] ensures non-iterables contained in list, result list contains lists, of may have single element.


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