Functions

Functional interface to graph methods and assorted utilities.

Graph

degree(G[, nbunch, weighted])	Return degree of single node or of nbunch of nodes.
degree_histogram(G)	Return a list of the frequency of each degree value.
density(G)	Return the density of a graph.
info(G[, n])	Print short summary of information for the graph G or the node n.
create_empty_copy(G[, with_nodes])	Return a copy of the graph G with all of the edges removed.
is_directed(G)	Return True if graph is directed.

Nodes

nodes(G)	Return a copy of the graph nodes in a list.
number_of_nodes(G)	Return the number of nodes in the graph.
nodes_iter(G)	Return an iterator over the graph nodes.

Edges

edges(G[, nbunch])	Return list of edges adjacent to nodes in nbunch.
number_of_edges(G)	Return the number of edges in the graph.
edges_iter(G[, nbunch])	Return iterator over edges adjacent to nodes in nbunch.

Attributes

set_node_attributes(G, name, attributes)	Set node attributes from dictionary of nodes and values
get_node_attributes(G, name)	Get node attributes from graph
set_edge_attributes(G, name, attributes)	Set edge attributes from dictionary of edge tuples and values
get_edge_attributes(G, name)	Get edge attributes from graph

Freezing graph structure

freeze(G)	Modify graph to prevent addition of nodes or edges.
is_frozen(G)	Return True if graph is frozen.