def collect_compare_into(left, right, added, removed, altered, same):
    """
    collects the differences between left and right, which are
    filenames for valid zip files, into the lists added, removed,
    altered, and same.  Returns a tuple of added, removed, altered,
    same
    """

    with open_zip(left) as l:
        with open_zip(right) as r:
            return collect_compare_zips_into(l, r,
                                             added, removed,
                                             altered, same)
collects the differences between left and right, which are
    filenames for valid zip files, into the lists added, removed,
    altered, and same.  Returns a tuple of added, removed, altered,
    same