networkx.readwrite.edgelist.read_edgelist¶
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read_edgelist
(path, comments='#', delimiter=None, create_using=None, nodetype=None, data=True, edgetype=None, encoding='utf-8')[source]¶ Read a graph from a list of edges.
- Parameters
path (file or string) – File or filename to read. If a file is provided, it must be opened in ‘rb’ mode. Filenames ending in .gz or .bz2 will be uncompressed.
comments (string, optional) – The character used to indicate the start of a comment.
delimiter (string, optional) – The string used to separate values. The default is whitespace.
create_using (NetworkX graph constructor, optional (default=nx.Graph)) – Graph type to create. If graph instance, then cleared before populated.
nodetype (int, float, str, Python type, optional) – Convert node data from strings to specified type
data (bool or list of (label,type) tuples) – Tuples specifying dictionary key names and types for edge data
edgetype (int, float, str, Python type, optional OBSOLETE) – Convert edge data from strings to specified type and use as ‘weight’
encoding (string, optional) – Specify which encoding to use when reading file.
- Returns
G – A networkx Graph or other type specified with create_using
- Return type
graph
Examples
>>> nx.write_edgelist(nx.path_graph(4), "test.edgelist") >>> G = nx.read_edgelist("test.edgelist")
>>> fh = open("test.edgelist", "rb") >>> G = nx.read_edgelist(fh) >>> fh.close()
>>> G = nx.read_edgelist("test.edgelist", nodetype=int) >>> G = nx.read_edgelist("test.edgelist", create_using=nx.DiGraph)
Edgelist with data in a list:
>>> textline = "1 2 3" >>> fh = open("test.edgelist", "w") >>> d = fh.write(textline) >>> fh.close() >>> G = nx.read_edgelist("test.edgelist", nodetype=int, data=(("weight", float),)) >>> list(G) [1, 2] >>> list(G.edges(data=True)) [(1, 2, {'weight': 3.0})]
See parse_edgelist() for more examples of formatting.
See also
Notes
Since nodes must be hashable, the function nodetype must return hashable types (e.g. int, float, str, frozenset - or tuples of those, etc.)