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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 walk(self, node, *listeners:RDLListener):
 """ Initiates the walker to traverse the current ``node`` and its children. Calls the corresponding callback for each of the ``listeners`` provided in the order that they are listed. Parameters node : :class:`~systemrdl.node.Node` Node to start traversing. Listener traversal includes this node. listeners : list List of :class:`~RDLListener` that are invoked during node traversal. Listener callbacks are executed in the same order as provided by this parameter. """



        for listener in listeners:
            self.do_enter(node, listener)
        for child in node.children(unroll=self.unroll, skip_not_present=self.skip_not_present):
            self.walk(child, *listeners)
        for listener in listeners:
            self.do_exit(node, listener)