networkx.readwrite.adjlist.read_adjlist¶
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read_adjlist
(path, comments='#', delimiter=None, create_using=None, nodetype=None, encoding='utf-8')[source]¶ Read graph in adjacency list format from path.
Parameters: - path (string or file) – Filename or file handle to read. Filenames ending in .gz or .bz2 will be uncompressed.
- create_using (NetworkX graph container) – Use given NetworkX graph for holding nodes or edges.
- nodetype (Python type, optional) – Convert nodes to this type.
- comments (string, optional) – Marker for comment lines
- delimiter (string, optional) – Separator for node labels. The default is whitespace.
Returns: G – The graph corresponding to the lines in adjacency list format.
Return type: NetworkX graph
Examples
>>> G=nx.path_graph(4) >>> nx.write_adjlist(G, "test.adjlist") >>> G=nx.read_adjlist("test.adjlist")
The path can be a filehandle or a string with the name of the file. If a filehandle is provided, it has to be opened in ‘rb’ mode.
>>> fh=open("test.adjlist", 'rb') >>> G=nx.read_adjlist(fh)
Filenames ending in .gz or .bz2 will be compressed.
>>> nx.write_adjlist(G,"test.adjlist.gz") >>> G=nx.read_adjlist("test.adjlist.gz")
The optional nodetype is a function to convert node strings to nodetype.
For example
>>> G=nx.read_adjlist("test.adjlist", nodetype=int)
will attempt to convert all nodes to integer type.
Since nodes must be hashable, the function nodetype must return hashable types (e.g. int, float, str, frozenset - or tuples of those, etc.)
The optional create_using parameter is a NetworkX graph container. The default is Graph(), an undirected graph. To read the data as a directed graph use
>>> G=nx.read_adjlist("test.adjlist", create_using=nx.DiGraph())
Notes
This format does not store graph or node data.
See also