Modify graph to prevent further change by adding or removing nodes or edges.
Node and edge data can still be modified.
Parameters: G (graph) – A NetworkX graph
>>> G = nx.path_graph(4) >>> G = nx.freeze(G) >>> try: ... G.add_edge(4, 5) ... except nx.NetworkXError as e: ... print(str(e)) Frozen graph can't be modified
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