(self)
Returns a sequence of the label bytes for the path from the root
        to the current arc.
Returns a sequence of the label bytes for the path from the root
        to the current arc.
Returns a sequence of the label bytes for the path from the root to the current arc .
def prefix(self):
        """Returns a sequence of the label bytes for the path from the root
        to the current arc.
        """

        raise NotImplementedError
def prefix ( self ) : raise NotImplementedError