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

See also

read_sparse6, from_sparse6_bytes

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'