Note

This documents the development version of NetworkX. Documentation for the current release can be found here.

networkx.readwrite.sparse6.write_sparse6

write_sparse6(G, path, nodes=None, header=True)[source]

Write graph G to given path in sparse6 format.

Parameters
GGraph (undirected)
pathfile 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 ‘>>sparse6<<’ string to head of data

Raises
NetworkXError

If the graph is directed

Notes

The format does not support edge or node labels.

References

1

Sparse6 specification <http://users.cecs.anu.edu.au/~bdm/data/formats.html>

Examples

You can write a sparse6 file by giving the path to the file:

>>> import tempfile
>>> with tempfile.NamedTemporaryFile() as f:
...     nx.write_sparse6(nx.path_graph(2), f.name)
...     print(f.read())
b'>>sparse6<<:An\n'

You can also write a sparse6 file by giving an open file-like object:

>>> with tempfile.NamedTemporaryFile() as f:
...     nx.write_sparse6(nx.path_graph(2), f)
...     _ = f.seek(0)
...     print(f.read())
b'>>sparse6<<:An\n'