def pretty_string_ops(n):
    """
    Return a humanized string representation of a large number.
    """
    abbrevs = [(1000000000000, 'Tera Ops'), (1000000000, 'Giga Ops'), (
        1000000, 'Mega Ops'), (1000, 'kilo Ops')]
    for factor, suffix in abbrevs:
        if n >= factor:
            break
    return '%.1f %s' % (float(n) / factor, suffix)
