/usr/lib/python2.7/dist-packages/networkx/algorithms/operators/unary.py is in python-networkx 1.8.1-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | """Unary operations on graphs"""
# Copyright (C) 2004-2012 by
# Aric Hagberg <hagberg@lanl.gov>
# Dan Schult <dschult@colgate.edu>
# Pieter Swart <swart@lanl.gov>
# All rights reserved.
# BSD license.
import networkx as nx
from networkx.utils import is_string_like
__author__ = """\n""".join(['Aric Hagberg (hagberg@lanl.gov)',
'Pieter Swart (swart@lanl.gov)',
'Dan Schult(dschult@colgate.edu)'])
__all__ = ['complement', 'reverse']
def complement(G, name=None):
"""Return the graph complement of G.
Parameters
----------
G : graph
A NetworkX graph
name : string
Specify name for new graph
Returns
-------
GC : A new graph.
Notes
------
Note that complement() does not create self-loops and also
does not produce parallel edges for MultiGraphs.
Graph, node, and edge data are not propagated to the new graph.
"""
if name is None:
name="complement(%s)"%(G.name)
R=G.__class__()
R.name=name
R.add_nodes_from(G)
R.add_edges_from( ((n,n2)
for n,nbrs in G.adjacency_iter()
for n2 in G if n2 not in nbrs
if n != n2) )
return R
def reverse(G, copy=True):
"""Return the reverse directed graph of G.
Parameters
----------
G : directed graph
A NetworkX directed graph
copy : bool
If True, then a new graph is returned. If False, then the graph is
reversed in place.
Returns
-------
H : directed graph
The reversed G.
"""
if not G.is_directed():
raise nx.NetworkXError("Cannot reverse an undirected graph.")
else:
return G.reverse(copy=copy)
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