/usr/lib/python3/dist-packages/networkx/algorithms/bipartite/edgelist.py is in python3-networkx 1.11-2.
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**********
Bipartite Edge Lists
**********
Read and write NetworkX graphs as bipartite edge lists.
Format
------
You can read or write three formats of edge lists with these functions.
Node pairs with no data::
1 2
Python dictionary as data::
1 2 {'weight':7, 'color':'green'}
Arbitrary data::
1 2 7 green
For each edge (u, v) the node u is assigned to part 0 and the node v to part 1.
"""
# Copyright (C) 2015 by
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
__all__ = ['generate_edgelist',
'write_edgelist',
'parse_edgelist',
'read_edgelist']
import networkx as nx
from networkx.utils import open_file, make_str, not_implemented_for
from networkx.convert import _prep_create_using
@open_file(1, mode='wb')
def write_edgelist(G, path, comments="#", delimiter=' ', data=True,
encoding = 'utf-8'):
"""Write a bipartite graph as a list of edges.
Parameters
----------
G : Graph
A NetworkX bipartite graph
path : file or string
File or filename to write. If a file is provided, it must be
opened in 'wb' mode. Filenames ending in .gz or .bz2 will be compressed.
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.
data : bool or list, optional
If False write no edge data.
If True write a string representation of the edge data dictionary..
If a list (or other iterable) is provided, write the keys specified
in the list.
encoding: string, optional
Specify which encoding to use when writing file.
Examples
--------
>>> G=nx.path_graph(4)
>>> G.add_nodes_from([0,2], bipartite=0)
>>> G.add_nodes_from([1,3], bipartite=1)
>>> nx.write_edgelist(G, "test.edgelist")
>>> fh=open("test.edgelist",'wb')
>>> nx.write_edgelist(G, fh)
>>> nx.write_edgelist(G, "test.edgelist.gz")
>>> nx.write_edgelist(G, "test.edgelist.gz", data=False)
>>> G=nx.Graph()
>>> G.add_edge(1,2,weight=7,color='red')
>>> nx.write_edgelist(G,'test.edgelist',data=False)
>>> nx.write_edgelist(G,'test.edgelist',data=['color'])
>>> nx.write_edgelist(G,'test.edgelist',data=['color','weight'])
See Also
--------
write_edgelist()
generate_edgelist()
"""
for line in generate_edgelist(G, delimiter, data):
line += '\n'
path.write(line.encode(encoding))
@not_implemented_for('directed')
def generate_edgelist(G, delimiter=' ', data=True):
"""Generate a single line of the bipartite graph G in edge list format.
Parameters
----------
G : NetworkX graph
The graph is assumed to have node attribute `part` set to 0,1 representing
the two graph parts
delimiter : string, optional
Separator for node labels
data : bool or list of keys
If False generate no edge data. If True use a dictionary
representation of edge data. If a list of keys use a list of data
values corresponding to the keys.
Returns
-------
lines : string
Lines of data in adjlist format.
Examples
--------
>>> from networkx.algorithms import bipartite
>>> G = nx.path_graph(4)
>>> G.add_nodes_from([0,2], bipartite=0)
>>> G.add_nodes_from([1,3], bipartite=1)
>>> G[1][2]['weight'] = 3
>>> G[2][3]['capacity'] = 12
>>> for line in bipartite.generate_edgelist(G, data=False):
... print(line)
0 1
2 1
2 3
>>> for line in bipartite.generate_edgelist(G):
... print(line)
0 1 {}
2 1 {'weight': 3}
2 3 {'capacity': 12}
>>> for line in bipartite.generate_edgelist(G,data=['weight']):
... print(line)
0 1
2 1 3
2 3
"""
try:
part0 = [n for n,d in G.node.items() if d['bipartite'] == 0]
except:
raise AttributeError("Missing node attribute `bipartite`")
if data is True or data is False:
for n in part0:
for e in G.edges(n, data=data):
yield delimiter.join(map(make_str,e))
else:
for n in part0:
for u,v,d in G.edges(n, data=True):
e = [u,v]
try:
e.extend(d[k] for k in data)
except KeyError:
pass # missing data for this edge, should warn?
yield delimiter.join(map(make_str,e))
def parse_edgelist(lines, comments='#', delimiter=None,
create_using=None, nodetype=None, data=True):
"""Parse lines of an edge list representation of a bipartite graph.
Parameters
----------
lines : list or iterator of strings
Input data in edgelist format
comments : string, optional
Marker for comment lines
delimiter : string, optional
Separator for node labels
create_using: NetworkX graph container, optional
Use given NetworkX graph for holding nodes or edges.
nodetype : Python type, optional
Convert nodes to this type.
data : bool or list of (label,type) tuples
If False generate no edge data or if True use a dictionary
representation of edge data or a list tuples specifying dictionary
key names and types for edge data.
Returns
-------
G: NetworkX Graph
The bipartite graph corresponding to lines
Examples
--------
Edgelist with no data:
>>> from networkx.algorithms import bipartite
>>> lines = ["1 2",
... "2 3",
... "3 4"]
>>> G = bipartite.parse_edgelist(lines, nodetype = int)
>>> sorted(G.nodes())
[1, 2, 3, 4]
>>> sorted(G.nodes(data=True))
[(1, {'bipartite': 0}), (2, {'bipartite': 0}), (3, {'bipartite': 0}), (4, {'bipartite': 1})]
>>> sorted(G.edges())
[(1, 2), (2, 3), (3, 4)]
Edgelist with data in Python dictionary representation:
>>> lines = ["1 2 {'weight':3}",
... "2 3 {'weight':27}",
... "3 4 {'weight':3.0}"]
>>> G = bipartite.parse_edgelist(lines, nodetype = int)
>>> sorted(G.nodes())
[1, 2, 3, 4]
>>> sorted(G.edges(data = True))
[(1, 2, {'weight': 3}), (2, 3, {'weight': 27}), (3, 4, {'weight': 3.0})]
Edgelist with data in a list:
>>> lines = ["1 2 3",
... "2 3 27",
... "3 4 3.0"]
>>> G = bipartite.parse_edgelist(lines, nodetype = int, data=(('weight',float),))
>>> sorted(G.nodes())
[1, 2, 3, 4]
>>> sorted(G.edges(data = True))
[(1, 2, {'weight': 3.0}), (2, 3, {'weight': 27.0}), (3, 4, {'weight': 3.0})]
See Also
--------
"""
from ast import literal_eval
G = _prep_create_using(create_using)
for line in lines:
p=line.find(comments)
if p>=0:
line = line[:p]
if not len(line):
continue
# split line, should have 2 or more
s=line.strip().split(delimiter)
if len(s)<2:
continue
u=s.pop(0)
v=s.pop(0)
d=s
if nodetype is not None:
try:
u=nodetype(u)
v=nodetype(v)
except:
raise TypeError("Failed to convert nodes %s,%s to type %s."
%(u,v,nodetype))
if len(d)==0 or data is False:
# no data or data type specified
edgedata={}
elif data is True:
# no edge types specified
try: # try to evaluate as dictionary
edgedata=dict(literal_eval(' '.join(d)))
except:
raise TypeError(
"Failed to convert edge data (%s) to dictionary."%(d))
else:
# convert edge data to dictionary with specified keys and type
if len(d)!=len(data):
raise IndexError(
"Edge data %s and data_keys %s are not the same length"%
(d, data))
edgedata={}
for (edge_key,edge_type),edge_value in zip(data,d):
try:
edge_value=edge_type(edge_value)
except:
raise TypeError(
"Failed to convert %s data %s to type %s."
%(edge_key, edge_value, edge_type))
edgedata.update({edge_key:edge_value})
G.add_node(u, bipartite=0)
G.add_node(v, bipartite=1)
G.add_edge(u, v, attr_dict=edgedata)
return G
@open_file(0,mode='rb')
def read_edgelist(path, comments="#",
delimiter=None, create_using=None,
nodetype=None, data=True, edgetype=None,
encoding='utf-8'):
"""Read a bipartite 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 : Graph container, optional,
Use specified container to build graph. The default is networkx.Graph,
an undirected graph.
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 : graph
A networkx Graph or other type specified with create_using
Examples
--------
>>> from networkx.algorithms import bipartite
>>> G = nx.path_graph(4)
>>> G.add_nodes_from([0,2], bipartite=0)
>>> G.add_nodes_from([1,3], bipartite=1)
>>> bipartite.write_edgelist(G, "test.edgelist")
>>> G = bipartite.read_edgelist("test.edgelist")
>>> fh = open("test.edgelist", 'rb')
>>> G = bipartite.read_edgelist(fh)
>>> fh.close()
>>> G=bipartite.read_edgelist("test.edgelist", nodetype=int)
Edgelist with data in a list:
>>> textline = '1 2 3'
>>> fh = open('test.edgelist','w')
>>> d = fh.write(textline)
>>> fh.close()
>>> G = bipartite.read_edgelist('test.edgelist', nodetype=int, data=(('weight',float),))
>>> G.nodes()
[1, 2]
>>> G.edges(data = True)
[(1, 2, {'weight': 3.0})]
See parse_edgelist() for more examples of formatting.
See Also
--------
parse_edgelist
Notes
-----
Since nodes must be hashable, the function nodetype must return hashable
types (e.g. int, float, str, frozenset - or tuples of those, etc.)
"""
lines = (line.decode(encoding) for line in path)
return parse_edgelist(lines,comments=comments,
delimiter=delimiter,
create_using=create_using,
nodetype=nodetype,
data=data)
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