read_weighted_edgelist(path, comments='#', delimiter=None, create_using=None, nodetype=None, encoding='utf-8')[source]#

Read a graph as list of edges with numeric weights.

pathfile 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.

commentsstring, optional

The character used to indicate the start of a comment.

delimiterstring, optional

The string used to separate values. The default is whitespace.

create_usingNetworkX graph constructor, optional (default=nx.Graph)

Graph type to create. If graph instance, then cleared before populated.

nodetypeint, float, str, Python type, optional

Convert node data from strings to specified type

encoding: string, optional

Specify which encoding to use when reading file.


A networkx Graph or other type specified with create_using


Since nodes must be hashable, the function nodetype must return hashable types (e.g. int, float, str, frozenset - or tuples of those, etc.)

Example edgelist file format.

With numeric edge data:

# read with
# >>> G=nx.read_weighted_edgelist(fh)
# source target data
a b 1
a c 3.14159
d e 42