code: def incoming_edges(self, node):
          
          edges = self.edges()
          in_edges = []
          for out_node, in_node in edges:
              if node is in_node:
                  in_edges.append((out_node, in_node))
          return tuple(in_edges)
docs: Returns a ``tuple`` of incoming edges for a **node object**.
          
          Arguments:
          
            - node(``object``) **node object** present in the graph to be queried 
              for incoming edges.