append_const (Was: Python 2.5 update)

By the way, for those using up to Python-2.4 (Optik 1.5a2), here is a
simple trick to implement the append_const action with a callback:

    def append_const_cb( const ):
        "Create callback to implement an append_const action via a callback=
."
        def cb( option, opt_str, value, parser ):
            getattr(parser.values, option.dest).append(const)
        return cb

    parser.add_option(...,
        action=3D'callback', callback=3Dappend_const_cb(YOUR_CONSTANT),
        ...)

    parser.add_option(...,
        action=3D'callback', callback=3Dappend_const_cb(OTHER_CONSTANT),
        ...)


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