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write_graph6

write_graph6(G, path, nodes=None, header=True)

Write a simple undirected graph to path in graph6 format.

Parameters:

G : Graph (undirected)

path : file or string

File or filename to write.

nodes: list or iterable

Nodes are labeled 0...n-1 in the order provided. If None the ordering given by G.nodes() is used.

header: bool

If True add ‘>>graph6<<’ string to head of data

Raises:

NetworkXError

If the graph is directed or has parallel edges

See also

generate_graph6, parse_graph6, read_graph6

Notes

The format does not support edge or node labels, parallel edges or self loops. If self loops are present they are silently ignored.

References

Graph6 specification: http://cs.anu.edu.au/~bdm/data/formats.txt for details.

Examples

>>> G = nx.Graph([(0, 1)])
>>> nx.write_graph6(G, 'test.g6')