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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def touch(args):
 """ find . -type l | %prog touch Linux commands `touch` wouldn't modify mtime for links, this script can. Use find to pipe in all the symlinks. """

    p = OptionParser(touch.__doc__)
    opts, args = p.parse_args(args)
    fp = sys.stdin

    for link_name in fp:
        link_name = link_name.strip()
        if not op.islink(link_name):
            continue
        if not op.exists(link_name):
            continue

        source = get_abs_path(link_name)
        lnsf(source, link_name)