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
    if debug:
        exhausted = []
    while iterators:
        if debug:
            time.sleep(0.1)
        try:
            current = next(iterators[-1])
        except StopIteration:
            it = iterators.pop()
            if debug:
                print('Stop iteration.')
                exhausted.append(it)
            continue
        if isinstance(current, traverse) and not isinstance(current, exclude):
            if last is current:
                if debug:
                    print('Last is Current', last)
                yield current
                iterators.pop()
                continue
            if debug:
                print('Traverse', current)
            iterators.append(iter(current))
            last = current
        else:
            if debug:
                print('Yielding', current)
            yield current
    if debug:
        print('Yielding exhausted iterators')
        yield exhausted