(self)
Returns a sequence of label bytes representing the next closest
        key in the graph.
Returns a sequence of label bytes representing the next closest
        key in the graph.
Returns a sequence of label bytes representing the next closest key in the graph .
def peek_key(self):
        """Returns a sequence of label bytes representing the next closest
        key in the graph.
        """

        for label in self.prefix():
            yield label
        c = self.copy()
        while not c.stopped():
            c.follow()
            yield c.label()
def peek_key ( self ) : for label in self . prefix ( ) : yield label c = self . copy ( ) while not c . stopped ( ) : c . follow ( ) yield c . label ( )