Graph.add_node

Graph.add_node(key=None, attr_dict=None, **kwattr)[source]

Add a node and specify its attributes (optional).

Parameters:
keyhashable, optional

An identifier for the node. Defaults to None, in which case an identifier of type int is automatically generated.

attr_dictdict[str, Any], optional

A dictionary of vertex attributes.

**kwattrdict[str, Any], optional

A dictionary of additional attributes compiled of remaining named arguments.

Returns:
hashable

The identifier of the node.

See also

add_edge()
delete_node()

Notes

If no key is provided for the node, one is generated automatically. An automatically generated key increments the highest integer key in use by 1.

Examples

>>> graph = Graph()
>>> node = graph.add_node()
>>> node
0