How to generate a fully connected subgraph from node list using python's networkx module

Question

I need to generate a fully connected subgraph with networkx, starting from the list of nodes I want to connect. Basically, I want all the nodes in the list I pass to the function to be all connected with each other.

I wonder if there is any built-in function to achieve this (which I haven't found)? Or should I think of some algorithm?

Thank you very much.

Answer 1

I don't know of any method which does this, but you can easily mimic the complete_graph() method of networkx and slightly change it(almost like a builtin):

import networkx
import itertools

def complete_graph_from_list(L, create_using=None):
    G = networkx.empty_graph(len(L),create_using)
    if len(L)>1:
        if G.is_directed():
            edges = itertools.permutations(L,2)
        else:
            edges = itertools.combinations(L,2)
        G.add_edges_from(edges)
    return G

S = complete_graph_from_list(["a", "b", "c", "d"])
print S.edges()