Method add_node

graphs_trees/graph/graph.py:48–53

(self, key)

        self.nodes = {}  # Key = key, val = Node

    def add_node(self, key):
        if key is None:
            raise TypeError('key cannot be None')
        if key not in self.nodes:
            self.nodes[key] = Node(key)
        return self.nodes[key]

    def add_edge(self, source_key, dest_key, weight=0):
        if source_key is None or dest_key is None: