flat_list_gen.py

def flat_sequnce_gen(input_list, traverse=None, exclude=None, debug=False):
    traverse = traverse or (list, tuple)
    exclude = exclude or (str, bytes, int, float, complex)
    iterators = [iter(input_list)]
    last = None
    while iterators:
        try:
            current = next(iterators[-1])
        except StopIteration:
            iterators.pop()
            continue
        if isinstance(current, traverse) and not isinstance(current, exclude):
            if last is current:
                yield current
                iterators.pop()
                continue
            iterators.append(iter(current))
            last = current
        else:
            yield current