Warning

This documents an unmaintained version of NetworkX. Please upgrade to a maintained version and see the current NetworkX documentation.

networkx.algorithms.isolate.is_isolate

is_isolate(G, n)

Determines whether a node is an isolate.

An isolate is a node with no neighbors (that is, with degree zero). For directed graphs, this means no in-neighbors and no out-neighbors.

Parameters:

• G (NetworkX graph)
• n (node) – A node in G.

Returns:

is_isolate – True if and only if n has no neighbors.

Return type:

bool

Examples

>>> G=nx.Graph()
>>> G.add_edge(1,2)
>>> G.add_node(3)
>>> nx.is_isolate(G,2)
False
>>> nx.is_isolate(G,3)
True