qiskit/dagcircuit/dagcircuit.py
def topological_nodes(self):
        """
        Yield nodes in topological order.

        Returns:
            generator(DAGNode): node in topological order
        """
        return nx.lexicographical_topological_sort(self._multi_graph,
                                                   key=lambda x: str(x.qargs))
def topological_nodes(self):
        return nx.lexicographical_topological_sort(self._multi_graph,
                                                   key=lambda x: str(x.qargs))
def topological_nodes ( self ) : return nx . lexicographical_topological_sort ( self . _multi_graph , key = lambda x : str ( x . qargs ) )
Yield nodes in topological order.

        Returns:
            generator(DAGNode): node in topological order
Yield nodes in topological order .