freeze

freeze(G)

Modify graph to prevent further change by adding or removing nodes or edges.

Node and edge data can still be modified.

Parameters

Ggraph

A NetworkX graph

See also

is_frozen

Notes

To “unfreeze” a graph you must make a copy by creating a new graph object:

>>> graph = nx.path_graph(4)
>>> frozen_graph = nx.freeze(graph)
>>> unfrozen_graph = nx.Graph(frozen_graph)
>>> nx.is_frozen(unfrozen_graph)
False

Examples

>>> G = nx.path_graph(4)
>>> G = nx.freeze(G)
>>> try:
...     G.add_edge(4, 5)
... except nx.NetworkXError as err:
...     print(str(err))
Frozen graph can't be modified