# create a method to extract values from List
def iterable(values):
    result_values = []
    for element in values:
        if isinstance(element, list):
            sub_iter_elements = iterable(element)
            result_values.extend(sub_iter_elements)
        else:
            result_values.append(element)
    return result_values

# create some test examples using a dict
if __name__ == '__main__':
    test_dict = {}
    test_dict['A'] = [1,[2,3,[4,[5,[6,7,[8,[9,10,11]]]]]]]
    test_dict['B'] = [1,2]
    test_dict['C'] = [1,2,[3,4]]
    test_dict['D'] = 1
    # obtain every test case and run the method to extract values
    # in case you do not provide an array/list the stuff is going to return a message
    for test_value in test_dict.keys():
        iter_list = test_dict[test_value]
        if isinstance(iter_list, list):
            flatten_array = iterable(iter_list)
            print(flatten_array)
        else:
            print('You are not providing an array/list')