Python - How to sort multidimensional list to two-dimensional list?

Question

How i can sort multidimensional list to two-dimensional list?

Multidimensional input: [8, [6, 7, [-1], [4, [[10]]], 2], 1]

Desired two-dimension

Answer 1

Somebody recently posted a similar question which, by the time I composed my answer, was closed as a duplicate. So I figured I'd add my answer here.

def extract_entries(nested_list, new_list=[]):
    # Add the list of all of the items in  that are NOT lists themselves. 
    new_list.append( [ e for e in nested_list if type(e) != list ] )

    # Look at entries in  that ARE lists themselves.
    for entry in nested_list:
        if type(entry) == list:
            extract_entries(entry, new_list)

    return new_list

Testing:

M = [8, [6, 7, [-1], [4, [[10]]], 2], 1]
print(extract_entries(M))
# Returns: [[8, 1], [6, 7, 2], [-1], [4], [], [10]]