def METHOD_NAME(cookie):
    """Return string representation of Cookie in the LWP cookie file format.
    Actually, the format is extended a bit -- see module docstring.
    """
    h = [(cookie.name, cookie.value),
         ("path", cookie.path),
         ("domain", cookie.domain)]
    if cookie.port is not None: h.append(("port", cookie.port))
    if cookie.path_specified: h.append(("path_spec", None))
    if cookie.port_specified: h.append(("port_spec", None))
    if cookie.domain_initial_dot: h.append(("domain_dot", None))
    if cookie.secure: h.append(("secure", None))
    if cookie.expires: h.append(("expires",
                               time2isoz(float(cookie.expires))))
    if cookie.discard: h.append(("discard", None))
    if cookie.comment: h.append(("comment", cookie.comment))
    if cookie.comment_url: h.append(("commenturl", cookie.comment_url))
    keys = cookie._rest.keys()
    keys.sort()
    for k in keys:
        h.append((k, str(cookie._rest[k])))
    h.append(("version", str(cookie.version)))
    return join_header_words([h])