relabel_nodes

relabel_nodes(G, mapping, copy=True)[source]

Relabel the nodes of the graph G.

Parameters:
  • G (graph) – A NetworkX graph
  • mapping (dictionary) – A dictionary with the old labels as keys and new labels as values. A partial mapping is allowed.
  • copy (bool (optional, default=True)) – If True return a copy, or if False relabel the nodes in place.

Examples

>>> G=nx.path_graph(3)  # nodes 0-1-2
>>> mapping={0:'a',1:'b',2:'c'}
>>> H=nx.relabel_nodes(G,mapping)
>>> print(sorted(H.nodes()))
['a', 'b', 'c']
>>> G=nx.path_graph(26) # nodes 0..25
>>> mapping=dict(zip(G.nodes(),"abcdefghijklmnopqrstuvwxyz"))
>>> H=nx.relabel_nodes(G,mapping) # nodes a..z
>>> mapping=dict(zip(G.nodes(),range(1,27)))
>>> G1=nx.relabel_nodes(G,mapping) # nodes 1..26

Partial in-place mapping:

>>> G=nx.path_graph(3)  # nodes 0-1-2
>>> mapping={0:'a',1:'b'} # 0->'a' and 1->'b'
>>> G=nx.relabel_nodes(G,mapping, copy=False)

print(G.nodes()) [2, ‘b’, ‘a’]

Mapping as function:

>>> G=nx.path_graph(3)
>>> def mapping(x):
...    return x**2
>>> H=nx.relabel_nodes(G,mapping)
>>> print(H.nodes())
[0, 1, 4]

Notes

Only the nodes specified in the mapping will be relabeled.

The keyword setting copy=False modifies the graph in place. This is not always possible if the mapping is circular. In that case use copy=True.