How do you delete a node in networkx?

Question

I have a dataset that I'm uploading as a graph for various timeframes and trying to figure relationships between them.

I want to delete all the nodes that do not have edges but I'm not sure the command to remove or delete nodes. Any idea how to do this?

Answer 1

import networkx as nx
import matplotlib.pyplot as plt

G=nx.Graph()
G.add_edges_from([('A','B'),('A','C'),('B','D'),('C','D')])
nx.draw(G)
plt.show()

G.remove_node('B')
nx.draw(G)
plt.show()

To remove multiple nodes, there is also the Graph.remove_nodes_from() method.

Answer 2

Documentation covers it.

Graph.remove_node(n): Remove node n.

Graph.remove_nodes_from(nodes): Remove multiple nodes.

For example:

In : G=networkx.Graph()

In : G.add_nodes_from([1,2,3])

In : G.nodes()
Out: [1, 2, 3]

In : G.remove_node(2)

In : G.nodes()
Out: [1, 3]