(self, node1, node2)
indicate that node1 depends on node2
indicate that node1 depends on node2
indicate that node1 depends on node2
def dependency(self, node1, node2):
        "indicate that node1 depends on node2"
        self.graph.add_node(node1)
        self.graph.add_node(node2)
        self.graph.add_edge(node2, node1)
def dependency ( self , node1 , node2 ) : self . graph . add_node ( node1 ) self . graph . add_node ( node2 ) self . graph . add_edge ( node2 , node1 )