I find that about 90% of the time I want want to zip iterators together, I expect them to be the same length and want to throw an exception if they aren't. Yet there is not currently a solution for this in the standard library for this, and as a result I always have to take this function everywhere I go: def zip_equal(*iterables): """ Zip and raise exception if lengths are not equal. Taken from solution by Martijn Pieters, here: http://stackoverflow.com/questions/32954486/zip-iterators-asserting-for-equa... :param iterables: Iterable objects :return: A new iterator outputting tuples where one element comes from each iterable """ sentinel = object() for combo in zip_longest(*iterables, fillvalue=sentinel): if any(sentinel is c for c in combo): raise ValueError('Iterables have different lengths. Iterable(s) #{} (of 0..{}) ran out first.'.format([i for i, c in enumerate(combo) if c is sentinel], len(combo)-1)) yield combo Would anybody object to adding this to the standard library for Python 3.8?