def repr_long_list(seq):
    """

    >>> repr_long_list(list(range(100)))
    '[0, 1, 2, ..., 98, 99]'
    """
    if len(seq) < 8:
        return repr(seq)
    else:
        return repr(seq[:3])[:-1] + ', ..., ' + repr(seq[-2:])[1:]