read.py 文件源码

def write_gml(G, path):
    """
    Write the graph G in GML format to the file or file handle path.

    Parameters
    ----------
    path : filename or filehandle
       The filename or filehandle to write.  Filenames ending in
       .gz or .gz2 will be compressed.

    See Also
    --------
    read_gml, parse_gml

    Notes
    -----
    GML specifications indicate that the file should only use
    7bit ASCII text encoding.iso8859-1 (latin-1).

    This implementation does not support all Python data types as GML
    data.  Nodes, node attributes, edge attributes, and graph
    attributes must be either dictionaries or single stings or
    numbers.  If they are not an attempt is made to represent them as
    strings.  For example, a list as edge data
    G[1][2]['somedata']=[1,2,3], will be represented in the GML file
    as::

       edge [
         source 1
         target 2
         somedata "[1, 2, 3]"
       ]


    Examples
    ---------
    >>> G=nx.path_graph(4)
    >>> nx.write_gml(G,"test.gml")

    Filenames ending in .gz or .bz2 will be compressed.

    >>> nx.write_gml(G,"test.gml.gz")
    """
    for line in generate_gml(G):
        line += '\n'
        path.write(line.encode('ascii', 'xmlcharrefreplace'))


# fixture for nose tests