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-equal-length-in-python
    
        :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?