Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/networkx/classes/digraph.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 # Copyright (C) 2004-2019 by
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2 # Aric Hagberg <hagberg@lanl.gov>
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3 # Dan Schult <dschult@colgate.edu>
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4 # Pieter Swart <swart@lanl.gov>
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5 # All rights reserved.
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6 # BSD license.
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7 #
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8 # Authors: Aric Hagberg <hagberg@lanl.gov>
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9 # Dan Schult <dschult@colgate.edu>
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10 # Pieter Swart <swart@lanl.gov>
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11 """Base class for directed graphs."""
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12 from copy import deepcopy
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13
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14 import networkx as nx
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15 from networkx.classes.graph import Graph
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16 from networkx.classes.coreviews import AdjacencyView
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17 from networkx.classes.reportviews import OutEdgeView, InEdgeView, \
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18 DiDegreeView, InDegreeView, OutDegreeView
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19 from networkx.exception import NetworkXError
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20 import networkx.convert as convert
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21
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22
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23 class DiGraph(Graph):
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24 """
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25 Base class for directed graphs.
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26
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27 A DiGraph stores nodes and edges with optional data, or attributes.
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28
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29 DiGraphs hold directed edges. Self loops are allowed but multiple
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30 (parallel) edges are not.
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31
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32 Nodes can be arbitrary (hashable) Python objects with optional
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33 key/value attributes. By convention `None` is not used as a node.
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34
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35 Edges are represented as links between nodes with optional
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36 key/value attributes.
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37
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38 Parameters
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39 ----------
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40 incoming_graph_data : input graph (optional, default: None)
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41 Data to initialize graph. If None (default) an empty
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42 graph is created. The data can be any format that is supported
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43 by the to_networkx_graph() function, currently including edge list,
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44 dict of dicts, dict of lists, NetworkX graph, NumPy matrix
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45 or 2d ndarray, SciPy sparse matrix, or PyGraphviz graph.
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46
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47 attr : keyword arguments, optional (default= no attributes)
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48 Attributes to add to graph as key=value pairs.
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49
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50 See Also
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51 --------
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52 Graph
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53 MultiGraph
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54 MultiDiGraph
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55 OrderedDiGraph
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56
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57 Examples
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58 --------
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59 Create an empty graph structure (a "null graph") with no nodes and
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60 no edges.
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61
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62 >>> G = nx.DiGraph()
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63
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64 G can be grown in several ways.
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65
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66 **Nodes:**
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67
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68 Add one node at a time:
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69
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70 >>> G.add_node(1)
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71
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72 Add the nodes from any container (a list, dict, set or
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73 even the lines from a file or the nodes from another graph).
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74
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75 >>> G.add_nodes_from([2, 3])
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76 >>> G.add_nodes_from(range(100, 110))
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77 >>> H = nx.path_graph(10)
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78 >>> G.add_nodes_from(H)
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79
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80 In addition to strings and integers any hashable Python object
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81 (except None) can represent a node, e.g. a customized node object,
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82 or even another Graph.
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83
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84 >>> G.add_node(H)
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85
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86 **Edges:**
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87
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88 G can also be grown by adding edges.
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89
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90 Add one edge,
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91
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92 >>> G.add_edge(1, 2)
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93
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94 a list of edges,
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95
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96 >>> G.add_edges_from([(1, 2), (1, 3)])
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97
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98 or a collection of edges,
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99
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100 >>> G.add_edges_from(H.edges)
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101
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102 If some edges connect nodes not yet in the graph, the nodes
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103 are added automatically. There are no errors when adding
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104 nodes or edges that already exist.
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105
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106 **Attributes:**
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107
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108 Each graph, node, and edge can hold key/value attribute pairs
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109 in an associated attribute dictionary (the keys must be hashable).
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110 By default these are empty, but can be added or changed using
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111 add_edge, add_node or direct manipulation of the attribute
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112 dictionaries named graph, node and edge respectively.
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113
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114 >>> G = nx.DiGraph(day="Friday")
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115 >>> G.graph
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116 {'day': 'Friday'}
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117
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118 Add node attributes using add_node(), add_nodes_from() or G.nodes
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119
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120 >>> G.add_node(1, time='5pm')
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121 >>> G.add_nodes_from([3], time='2pm')
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122 >>> G.nodes[1]
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123 {'time': '5pm'}
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124 >>> G.nodes[1]['room'] = 714
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125 >>> del G.nodes[1]['room'] # remove attribute
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126 >>> list(G.nodes(data=True))
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127 [(1, {'time': '5pm'}), (3, {'time': '2pm'})]
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128
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129 Add edge attributes using add_edge(), add_edges_from(), subscript
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130 notation, or G.edges.
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131
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132 >>> G.add_edge(1, 2, weight=4.7 )
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133 >>> G.add_edges_from([(3, 4), (4, 5)], color='red')
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134 >>> G.add_edges_from([(1, 2, {'color':'blue'}), (2, 3, {'weight':8})])
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135 >>> G[1][2]['weight'] = 4.7
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136 >>> G.edges[1, 2]['weight'] = 4
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137
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138 Warning: we protect the graph data structure by making `G.edges[1, 2]` a
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139 read-only dict-like structure. However, you can assign to attributes
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140 in e.g. `G.edges[1, 2]`. Thus, use 2 sets of brackets to add/change
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141 data attributes: `G.edges[1, 2]['weight'] = 4`
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142 (For multigraphs: `MG.edges[u, v, key][name] = value`).
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143
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144 **Shortcuts:**
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145
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146 Many common graph features allow python syntax to speed reporting.
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147
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148 >>> 1 in G # check if node in graph
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149 True
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150 >>> [n for n in G if n < 3] # iterate through nodes
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151 [1, 2]
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152 >>> len(G) # number of nodes in graph
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153 5
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154
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155 Often the best way to traverse all edges of a graph is via the neighbors.
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156 The neighbors are reported as an adjacency-dict `G.adj` or `G.adjacency()`
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157
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158 >>> for n, nbrsdict in G.adjacency():
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159 ... for nbr, eattr in nbrsdict.items():
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160 ... if 'weight' in eattr:
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161 ... # Do something useful with the edges
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162 ... pass
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163
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164 But the edges reporting object is often more convenient:
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165
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166 >>> for u, v, weight in G.edges(data='weight'):
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167 ... if weight is not None:
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168 ... # Do something useful with the edges
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169 ... pass
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170
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171 **Reporting:**
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172
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173 Simple graph information is obtained using object-attributes and methods.
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174 Reporting usually provides views instead of containers to reduce memory
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175 usage. The views update as the graph is updated similarly to dict-views.
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176 The objects `nodes, `edges` and `adj` provide access to data attributes
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177 via lookup (e.g. `nodes[n], `edges[u, v]`, `adj[u][v]`) and iteration
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178 (e.g. `nodes.items()`, `nodes.data('color')`,
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179 `nodes.data('color', default='blue')` and similarly for `edges`)
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180 Views exist for `nodes`, `edges`, `neighbors()`/`adj` and `degree`.
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181
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182 For details on these and other miscellaneous methods, see below.
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183
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184 **Subclasses (Advanced):**
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185
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186 The Graph class uses a dict-of-dict-of-dict data structure.
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187 The outer dict (node_dict) holds adjacency information keyed by node.
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188 The next dict (adjlist_dict) represents the adjacency information and holds
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189 edge data keyed by neighbor. The inner dict (edge_attr_dict) represents
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190 the edge data and holds edge attribute values keyed by attribute names.
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191
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192 Each of these three dicts can be replaced in a subclass by a user defined
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193 dict-like object. In general, the dict-like features should be
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194 maintained but extra features can be added. To replace one of the
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195 dicts create a new graph class by changing the class(!) variable
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196 holding the factory for that dict-like structure. The variable names are
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197 node_dict_factory, node_attr_dict_factory, adjlist_inner_dict_factory,
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198 adjlist_outer_dict_factory, edge_attr_dict_factory and graph_attr_dict_factory.
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199
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200 node_dict_factory : function, (default: dict)
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201 Factory function to be used to create the dict containing node
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202 attributes, keyed by node id.
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203 It should require no arguments and return a dict-like object
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204
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205 node_attr_dict_factory: function, (default: dict)
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206 Factory function to be used to create the node attribute
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207 dict which holds attribute values keyed by attribute name.
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208 It should require no arguments and return a dict-like object
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209
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210 adjlist_outer_dict_factory : function, (default: dict)
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211 Factory function to be used to create the outer-most dict
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212 in the data structure that holds adjacency info keyed by node.
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213 It should require no arguments and return a dict-like object.
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214
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215 adjlist_inner_dict_factory : function, optional (default: dict)
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216 Factory function to be used to create the adjacency list
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217 dict which holds edge data keyed by neighbor.
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218 It should require no arguments and return a dict-like object
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219
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220 edge_attr_dict_factory : function, optional (default: dict)
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221 Factory function to be used to create the edge attribute
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222 dict which holds attribute values keyed by attribute name.
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223 It should require no arguments and return a dict-like object.
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224
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225 graph_attr_dict_factory : function, (default: dict)
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226 Factory function to be used to create the graph attribute
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227 dict which holds attribute values keyed by attribute name.
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228 It should require no arguments and return a dict-like object.
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229
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230 Typically, if your extension doesn't impact the data structure all
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231 methods will inherited without issue except: `to_directed/to_undirected`.
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232 By default these methods create a DiGraph/Graph class and you probably
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233 want them to create your extension of a DiGraph/Graph. To facilitate
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234 this we define two class variables that you can set in your subclass.
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235
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236 to_directed_class : callable, (default: DiGraph or MultiDiGraph)
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237 Class to create a new graph structure in the `to_directed` method.
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238 If `None`, a NetworkX class (DiGraph or MultiDiGraph) is used.
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239
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240 to_undirected_class : callable, (default: Graph or MultiGraph)
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241 Class to create a new graph structure in the `to_undirected` method.
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242 If `None`, a NetworkX class (Graph or MultiGraph) is used.
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243
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244 Examples
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245 --------
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246
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247 Create a low memory graph class that effectively disallows edge
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248 attributes by using a single attribute dict for all edges.
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249 This reduces the memory used, but you lose edge attributes.
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250
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251 >>> class ThinGraph(nx.Graph):
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252 ... all_edge_dict = {'weight': 1}
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253 ... def single_edge_dict(self):
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254 ... return self.all_edge_dict
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255 ... edge_attr_dict_factory = single_edge_dict
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256 >>> G = ThinGraph()
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257 >>> G.add_edge(2, 1)
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258 >>> G[2][1]
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259 {'weight': 1}
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260 >>> G.add_edge(2, 2)
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261 >>> G[2][1] is G[2][2]
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262 True
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263
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264
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265 Please see :mod:`~networkx.classes.ordered` for more examples of
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266 creating graph subclasses by overwriting the base class `dict` with
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267 a dictionary-like object.
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268 """
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269
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270 def __init__(self, incoming_graph_data=None, **attr):
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271 """Initialize a graph with edges, name, or graph attributes.
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272
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273 Parameters
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274 ----------
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275 incoming_graph_data : input graph (optional, default: None)
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276 Data to initialize graph. If None (default) an empty
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277 graph is created. The data can be an edge list, or any
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278 NetworkX graph object. If the corresponding optional Python
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279 packages are installed the data can also be a NumPy matrix
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280 or 2d ndarray, a SciPy sparse matrix, or a PyGraphviz graph.
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281
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282 attr : keyword arguments, optional (default= no attributes)
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283 Attributes to add to graph as key=value pairs.
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284
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285 See Also
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286 --------
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287 convert
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288
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289 Examples
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290 --------
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291 >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc
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292 >>> G = nx.Graph(name='my graph')
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293 >>> e = [(1, 2), (2, 3), (3, 4)] # list of edges
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294 >>> G = nx.Graph(e)
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295
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296 Arbitrary graph attribute pairs (key=value) may be assigned
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297
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298 >>> G = nx.Graph(e, day="Friday")
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299 >>> G.graph
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300 {'day': 'Friday'}
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301
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302 """
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303 self.graph_attr_dict_factory = self.graph_attr_dict_factory
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304 self.node_dict_factory = self.node_dict_factory
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305 self.node_attr_dict_factory = self.node_attr_dict_factory
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306 self.adjlist_outer_dict_factory = self.adjlist_outer_dict_factory
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307 self.adjlist_inner_dict_factory = self.adjlist_inner_dict_factory
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308 self.edge_attr_dict_factory = self.edge_attr_dict_factory
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309
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310 self.graph = self.graph_attr_dict_factory() # dictionary for graph attributes
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311 self._node = self.node_dict_factory() # dictionary for node attr
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312 # We store two adjacency lists:
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313 # the predecessors of node n are stored in the dict self._pred
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314 # the successors of node n are stored in the dict self._succ=self._adj
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315 self._adj = self.adjlist_outer_dict_factory() # empty adjacency dict
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316 self._pred = self.adjlist_outer_dict_factory() # predecessor
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317 self._succ = self._adj # successor
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318
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319 # attempt to load graph with data
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320 if incoming_graph_data is not None:
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321 convert.to_networkx_graph(incoming_graph_data, create_using=self)
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322 # load graph attributes (must be after convert)
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323 self.graph.update(attr)
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324
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325 @property
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326 def adj(self):
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327 """Graph adjacency object holding the neighbors of each node.
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328
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329 This object is a read-only dict-like structure with node keys
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330 and neighbor-dict values. The neighbor-dict is keyed by neighbor
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331 to the edge-data-dict. So `G.adj[3][2]['color'] = 'blue'` sets
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332 the color of the edge `(3, 2)` to `"blue"`.
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333
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334 Iterating over G.adj behaves like a dict. Useful idioms include
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335 `for nbr, datadict in G.adj[n].items():`.
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336
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337 The neighbor information is also provided by subscripting the graph.
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338 So `for nbr, foovalue in G[node].data('foo', default=1):` works.
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339
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340 For directed graphs, `G.adj` holds outgoing (successor) info.
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341 """
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342 return AdjacencyView(self._succ)
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343
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344 @property
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345 def succ(self):
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346 """Graph adjacency object holding the successors of each node.
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347
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348 This object is a read-only dict-like structure with node keys
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349 and neighbor-dict values. The neighbor-dict is keyed by neighbor
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350 to the edge-data-dict. So `G.succ[3][2]['color'] = 'blue'` sets
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351 the color of the edge `(3, 2)` to `"blue"`.
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352
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353 Iterating over G.succ behaves like a dict. Useful idioms include
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354 `for nbr, datadict in G.succ[n].items():`. A data-view not provided
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355 by dicts also exists: `for nbr, foovalue in G.succ[node].data('foo'):`
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356 and a default can be set via a `default` argument to the `data` method.
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357
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358 The neighbor information is also provided by subscripting the graph.
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359 So `for nbr, foovalue in G[node].data('foo', default=1):` works.
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360
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361 For directed graphs, `G.adj` is identical to `G.succ`.
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362 """
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363 return AdjacencyView(self._succ)
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364
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365 @property
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366 def pred(self):
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367 """Graph adjacency object holding the predecessors of each node.
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368
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369 This object is a read-only dict-like structure with node keys
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370 and neighbor-dict values. The neighbor-dict is keyed by neighbor
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371 to the edge-data-dict. So `G.pred[2][3]['color'] = 'blue'` sets
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372 the color of the edge `(3, 2)` to `"blue"`.
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373
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374 Iterating over G.pred behaves like a dict. Useful idioms include
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375 `for nbr, datadict in G.pred[n].items():`. A data-view not provided
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376 by dicts also exists: `for nbr, foovalue in G.pred[node].data('foo'):`
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377 A default can be set via a `default` argument to the `data` method.
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378 """
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379 return AdjacencyView(self._pred)
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380
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381 def add_node(self, node_for_adding, **attr):
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382 """Add a single node `node_for_adding` and update node attributes.
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383
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384 Parameters
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385 ----------
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386 node_for_adding : node
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387 A node can be any hashable Python object except None.
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388 attr : keyword arguments, optional
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389 Set or change node attributes using key=value.
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390
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391 See Also
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392 --------
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393 add_nodes_from
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394
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395 Examples
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396 --------
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397 >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc
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398 >>> G.add_node(1)
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399 >>> G.add_node('Hello')
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400 >>> K3 = nx.Graph([(0, 1), (1, 2), (2, 0)])
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401 >>> G.add_node(K3)
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402 >>> G.number_of_nodes()
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403 3
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404
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405 Use keywords set/change node attributes:
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406
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407 >>> G.add_node(1, size=10)
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408 >>> G.add_node(3, weight=0.4, UTM=('13S', 382871, 3972649))
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409
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410 Notes
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411 -----
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412 A hashable object is one that can be used as a key in a Python
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413 dictionary. This includes strings, numbers, tuples of strings
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414 and numbers, etc.
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415
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416 On many platforms hashable items also include mutables such as
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417 NetworkX Graphs, though one should be careful that the hash
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418 doesn't change on mutables.
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419 """
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420 if node_for_adding not in self._succ:
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421 self._succ[node_for_adding] = self.adjlist_inner_dict_factory()
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422 self._pred[node_for_adding] = self.adjlist_inner_dict_factory()
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423 attr_dict = self._node[node_for_adding] = self.node_attr_dict_factory()
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424 attr_dict.update(attr)
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425 else: # update attr even if node already exists
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426 self._node[node_for_adding].update(attr)
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427
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428 def add_nodes_from(self, nodes_for_adding, **attr):
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429 """Add multiple nodes.
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430
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431 Parameters
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432 ----------
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433 nodes_for_adding : iterable container
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434 A container of nodes (list, dict, set, etc.).
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435 OR
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436 A container of (node, attribute dict) tuples.
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437 Node attributes are updated using the attribute dict.
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438 attr : keyword arguments, optional (default= no attributes)
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439 Update attributes for all nodes in nodes.
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440 Node attributes specified in nodes as a tuple take
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441 precedence over attributes specified via keyword arguments.
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442
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443 See Also
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444 --------
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445 add_node
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446
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447 Examples
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448 --------
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449 >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc
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450 >>> G.add_nodes_from('Hello')
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451 >>> K3 = nx.Graph([(0, 1), (1, 2), (2, 0)])
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452 >>> G.add_nodes_from(K3)
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453 >>> sorted(G.nodes(), key=str)
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454 [0, 1, 2, 'H', 'e', 'l', 'o']
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455
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456 Use keywords to update specific node attributes for every node.
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457
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458 >>> G.add_nodes_from([1, 2], size=10)
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459 >>> G.add_nodes_from([3, 4], weight=0.4)
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460
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461 Use (node, attrdict) tuples to update attributes for specific nodes.
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462
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463 >>> G.add_nodes_from([(1, dict(size=11)), (2, {'color':'blue'})])
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464 >>> G.nodes[1]['size']
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465 11
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466 >>> H = nx.Graph()
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467 >>> H.add_nodes_from(G.nodes(data=True))
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468 >>> H.nodes[1]['size']
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469 11
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470
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471 """
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472 for n in nodes_for_adding:
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473 # keep all this inside try/except because
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474 # CPython throws TypeError on n not in self._succ,
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475 # while pre-2.7.5 ironpython throws on self._succ[n]
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476 try:
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477 if n not in self._succ:
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478 self._succ[n] = self.adjlist_inner_dict_factory()
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479 self._pred[n] = self.adjlist_inner_dict_factory()
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480 attr_dict = self._node[n] = self.node_attr_dict_factory()
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481 attr_dict.update(attr)
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482 else:
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483 self._node[n].update(attr)
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484 except TypeError:
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485 nn, ndict = n
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486 if nn not in self._succ:
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487 self._succ[nn] = self.adjlist_inner_dict_factory()
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488 self._pred[nn] = self.adjlist_inner_dict_factory()
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489 newdict = attr.copy()
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490 newdict.update(ndict)
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491 attr_dict = self._node[nn] = self.node_attr_dict_factory()
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492 attr_dict.update(newdict)
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493 else:
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494 olddict = self._node[nn]
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495 olddict.update(attr)
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496 olddict.update(ndict)
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497
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498 def remove_node(self, n):
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499 """Remove node n.
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500
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501 Removes the node n and all adjacent edges.
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502 Attempting to remove a non-existent node will raise an exception.
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503
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504 Parameters
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505 ----------
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506 n : node
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507 A node in the graph
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508
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509 Raises
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510 -------
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511 NetworkXError
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512 If n is not in the graph.
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513
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514 See Also
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515 --------
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516 remove_nodes_from
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517
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518 Examples
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519 --------
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520 >>> G = nx.path_graph(3) # or DiGraph, MultiGraph, MultiDiGraph, etc
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521 >>> list(G.edges)
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522 [(0, 1), (1, 2)]
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523 >>> G.remove_node(1)
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524 >>> list(G.edges)
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525 []
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526
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527 """
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528 try:
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529 nbrs = self._succ[n]
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530 del self._node[n]
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531 except KeyError: # NetworkXError if n not in self
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532 raise NetworkXError("The node %s is not in the digraph." % (n,))
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533 for u in nbrs:
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534 del self._pred[u][n] # remove all edges n-u in digraph
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535 del self._succ[n] # remove node from succ
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536 for u in self._pred[n]:
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537 del self._succ[u][n] # remove all edges n-u in digraph
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538 del self._pred[n] # remove node from pred
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539
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540 def remove_nodes_from(self, nodes):
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541 """Remove multiple nodes.
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542
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543 Parameters
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544 ----------
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545 nodes : iterable container
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546 A container of nodes (list, dict, set, etc.). If a node
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547 in the container is not in the graph it is silently ignored.
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548
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549 See Also
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550 --------
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551 remove_node
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552
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553 Examples
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554 --------
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555 >>> G = nx.path_graph(3) # or DiGraph, MultiGraph, MultiDiGraph, etc
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556 >>> e = list(G.nodes)
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557 >>> e
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558 [0, 1, 2]
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559 >>> G.remove_nodes_from(e)
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560 >>> list(G.nodes)
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561 []
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562
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563 """
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564 for n in nodes:
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565 try:
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566 succs = self._succ[n]
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567 del self._node[n]
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568 for u in succs:
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569 del self._pred[u][n] # remove all edges n-u in digraph
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570 del self._succ[n] # now remove node
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571 for u in self._pred[n]:
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572 del self._succ[u][n] # remove all edges n-u in digraph
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573 del self._pred[n] # now remove node
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574 except KeyError:
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575 pass # silent failure on remove
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576
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577 def add_edge(self, u_of_edge, v_of_edge, **attr):
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578 """Add an edge between u and v.
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579
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580 The nodes u and v will be automatically added if they are
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581 not already in the graph.
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582
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583 Edge attributes can be specified with keywords or by directly
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584 accessing the edge's attribute dictionary. See examples below.
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585
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586 Parameters
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587 ----------
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588 u, v : nodes
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589 Nodes can be, for example, strings or numbers.
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590 Nodes must be hashable (and not None) Python objects.
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591 attr : keyword arguments, optional
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592 Edge data (or labels or objects) can be assigned using
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593 keyword arguments.
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594
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595 See Also
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596 --------
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597 add_edges_from : add a collection of edges
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598
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599 Notes
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600 -----
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601 Adding an edge that already exists updates the edge data.
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602
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603 Many NetworkX algorithms designed for weighted graphs use
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604 an edge attribute (by default `weight`) to hold a numerical value.
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605
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606 Examples
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607 --------
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608 The following all add the edge e=(1, 2) to graph G:
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609
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610 >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc
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611 >>> e = (1, 2)
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612 >>> G.add_edge(1, 2) # explicit two-node form
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613 >>> G.add_edge(*e) # single edge as tuple of two nodes
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614 >>> G.add_edges_from( [(1, 2)] ) # add edges from iterable container
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615
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616 Associate data to edges using keywords:
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617
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618 >>> G.add_edge(1, 2, weight=3)
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619 >>> G.add_edge(1, 3, weight=7, capacity=15, length=342.7)
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620
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621 For non-string attribute keys, use subscript notation.
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622
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623 >>> G.add_edge(1, 2)
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624 >>> G[1][2].update({0: 5})
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625 >>> G.edges[1, 2].update({0: 5})
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626 """
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627 u, v = u_of_edge, v_of_edge
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628 # add nodes
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629 if u not in self._succ:
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630 self._succ[u] = self.adjlist_inner_dict_factory()
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631 self._pred[u] = self.adjlist_inner_dict_factory()
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632 self._node[u] = self.node_attr_dict_factory()
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633 if v not in self._succ:
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634 self._succ[v] = self.adjlist_inner_dict_factory()
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635 self._pred[v] = self.adjlist_inner_dict_factory()
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636 self._node[v] = self.node_attr_dict_factory()
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637 # add the edge
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diff changeset
638 datadict = self._adj[u].get(v, self.edge_attr_dict_factory())
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
639 datadict.update(attr)
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parents:
diff changeset
640 self._succ[u][v] = datadict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
641 self._pred[v][u] = datadict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
642
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
643 def add_edges_from(self, ebunch_to_add, **attr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
644 """Add all the edges in ebunch_to_add.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
645
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
646 Parameters
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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647 ----------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
648 ebunch_to_add : container of edges
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
649 Each edge given in the container will be added to the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
650 graph. The edges must be given as 2-tuples (u, v) or
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
651 3-tuples (u, v, d) where d is a dictionary containing edge data.
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parents:
diff changeset
652 attr : keyword arguments, optional
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
653 Edge data (or labels or objects) can be assigned using
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
654 keyword arguments.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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655
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parents:
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656 See Also
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657 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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658 add_edge : add a single edge
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
659 add_weighted_edges_from : convenient way to add weighted edges
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
660
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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661 Notes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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662 -----
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
663 Adding the same edge twice has no effect but any edge data
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
664 will be updated when each duplicate edge is added.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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665
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diff changeset
666 Edge attributes specified in an ebunch take precedence over
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
667 attributes specified via keyword arguments.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
668
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parents:
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669 Examples
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670 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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671 >>> G = nx.Graph() # or DiGraph, MultiGraph, MultiDiGraph, etc
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parents:
diff changeset
672 >>> G.add_edges_from([(0, 1), (1, 2)]) # using a list of edge tuples
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673 >>> e = zip(range(0, 3), range(1, 4))
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parents:
diff changeset
674 >>> G.add_edges_from(e) # Add the path graph 0-1-2-3
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parents:
diff changeset
675
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parents:
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676 Associate data to edges
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677
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parents:
diff changeset
678 >>> G.add_edges_from([(1, 2), (2, 3)], weight=3)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
679 >>> G.add_edges_from([(3, 4), (1, 4)], label='WN2898')
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680 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
681 for e in ebunch_to_add:
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682 ne = len(e)
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parents:
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683 if ne == 3:
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diff changeset
684 u, v, dd = e
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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685 elif ne == 2:
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parents:
diff changeset
686 u, v = e
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687 dd = {}
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688 else:
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diff changeset
689 raise NetworkXError(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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690 "Edge tuple %s must be a 2-tuple or 3-tuple." % (e,))
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691 if u not in self._succ:
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parents:
diff changeset
692 self._succ[u] = self.adjlist_inner_dict_factory()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
693 self._pred[u] = self.adjlist_inner_dict_factory()
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694 self._node[u] = self.node_attr_dict_factory()
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695 if v not in self._succ:
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parents:
diff changeset
696 self._succ[v] = self.adjlist_inner_dict_factory()
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diff changeset
697 self._pred[v] = self.adjlist_inner_dict_factory()
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diff changeset
698 self._node[v] = self.node_attr_dict_factory()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
699 datadict = self._adj[u].get(v, self.edge_attr_dict_factory())
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diff changeset
700 datadict.update(attr)
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parents:
diff changeset
701 datadict.update(dd)
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parents:
diff changeset
702 self._succ[u][v] = datadict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
703 self._pred[v][u] = datadict
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
704
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
705 def remove_edge(self, u, v):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
706 """Remove the edge between u and v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
707
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parents:
diff changeset
708 Parameters
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parents:
diff changeset
709 ----------
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parents:
diff changeset
710 u, v : nodes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
711 Remove the edge between nodes u and v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
712
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parents:
diff changeset
713 Raises
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parents:
diff changeset
714 ------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
715 NetworkXError
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
716 If there is not an edge between u and v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
717
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
718 See Also
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
719 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
720 remove_edges_from : remove a collection of edges
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
721
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
722 Examples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
723 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
724 >>> G = nx.Graph() # or DiGraph, etc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
725 >>> nx.add_path(G, [0, 1, 2, 3])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
726 >>> G.remove_edge(0, 1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
727 >>> e = (1, 2)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
728 >>> G.remove_edge(*e) # unpacks e from an edge tuple
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
729 >>> e = (2, 3, {'weight':7}) # an edge with attribute data
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
730 >>> G.remove_edge(*e[:2]) # select first part of edge tuple
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
731 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
732 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
733 del self._succ[u][v]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
734 del self._pred[v][u]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
735 except KeyError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
736 raise NetworkXError("The edge %s-%s not in graph." % (u, v))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
737
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
738 def remove_edges_from(self, ebunch):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
739 """Remove all edges specified in ebunch.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
740
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
741 Parameters
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
742 ----------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
743 ebunch: list or container of edge tuples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
744 Each edge given in the list or container will be removed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
745 from the graph. The edges can be:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
746
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
747 - 2-tuples (u, v) edge between u and v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
748 - 3-tuples (u, v, k) where k is ignored.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
749
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
750 See Also
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
751 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
752 remove_edge : remove a single edge
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
753
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
754 Notes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
755 -----
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
756 Will fail silently if an edge in ebunch is not in the graph.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
757
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
758 Examples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
759 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
760 >>> G = nx.path_graph(4) # or DiGraph, MultiGraph, MultiDiGraph, etc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
761 >>> ebunch = [(1, 2), (2, 3)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
762 >>> G.remove_edges_from(ebunch)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
763 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
764 for e in ebunch:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
765 u, v = e[:2] # ignore edge data
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
766 if u in self._succ and v in self._succ[u]:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
767 del self._succ[u][v]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
768 del self._pred[v][u]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
769
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
770 def has_successor(self, u, v):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
771 """Returns True if node u has successor v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
772
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
773 This is true if graph has the edge u->v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
774 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
775 return (u in self._succ and v in self._succ[u])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
776
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
777 def has_predecessor(self, u, v):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
778 """Returns True if node u has predecessor v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
779
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
780 This is true if graph has the edge u<-v.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
781 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
782 return (u in self._pred and v in self._pred[u])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
783
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 def successors(self, n):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
785 """Returns an iterator over successor nodes of n.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
786
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
787 A successor of n is a node m such that there exists a directed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
788 edge from n to m.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
789
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
790 Parameters
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
791 ----------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
792 n : node
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
793 A node in the graph
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
794
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
795 Raises
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
796 -------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
797 NetworkXError
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
798 If n is not in the graph.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
799
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
800 See Also
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
801 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
802 predecessors
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
803
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
804 Notes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
805 -----
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
806 neighbors() and successors() are the same.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
807 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
808 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
809 return iter(self._succ[n])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
810 except KeyError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
811 raise NetworkXError("The node %s is not in the digraph." % (n,))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
812
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
813 # digraph definitions
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
814 neighbors = successors
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
815
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
816 def predecessors(self, n):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
817 """Returns an iterator over predecessor nodes of n.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
818
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
819 A predecessor of n is a node m such that there exists a directed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
820 edge from m to n.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
821
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
822 Parameters
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
823 ----------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
824 n : node
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
825 A node in the graph
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
826
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
827 Raises
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
828 -------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
829 NetworkXError
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
830 If n is not in the graph.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
831
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
832 See Also
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
833 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
834 successors
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
835 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
836 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
837 return iter(self._pred[n])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
838 except KeyError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
839 raise NetworkXError("The node %s is not in the digraph." % (n,))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
840
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
841 @property
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
842 def edges(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
843 """An OutEdgeView of the DiGraph as G.edges or G.edges().
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
844
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
845 edges(self, nbunch=None, data=False, default=None)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
846
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
847 The OutEdgeView provides set-like operations on the edge-tuples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
848 as well as edge attribute lookup. When called, it also provides
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
849 an EdgeDataView object which allows control of access to edge
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
850 attributes (but does not provide set-like operations).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
851 Hence, `G.edges[u, v]['color']` provides the value of the color
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
852 attribute for edge `(u, v)` while
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
853 `for (u, v, c) in G.edges.data('color', default='red'):`
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
854 iterates through all the edges yielding the color attribute
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
855 with default `'red'` if no color attribute exists.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
856
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
857 Parameters
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
858 ----------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
859 nbunch : single node, container, or all nodes (default= all nodes)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
860 The view will only report edges incident to these nodes.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
861 data : string or bool, optional (default=False)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
862 The edge attribute returned in 3-tuple (u, v, ddict[data]).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
863 If True, return edge attribute dict in 3-tuple (u, v, ddict).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
864 If False, return 2-tuple (u, v).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
865 default : value, optional (default=None)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
866 Value used for edges that don't have the requested attribute.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
867 Only relevant if data is not True or False.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
868
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
869 Returns
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
870 -------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
871 edges : OutEdgeView
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
872 A view of edge attributes, usually it iterates over (u, v)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
873 or (u, v, d) tuples of edges, but can also be used for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
874 attribute lookup as `edges[u, v]['foo']`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
875
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
876 See Also
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
877 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
878 in_edges, out_edges
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
879
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
880 Notes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
881 -----
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
882 Nodes in nbunch that are not in the graph will be (quietly) ignored.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
883 For directed graphs this returns the out-edges.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
884
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
885 Examples
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
886 --------
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
887 >>> G = nx.DiGraph() # or MultiDiGraph, etc
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
888 >>> nx.add_path(G, [0, 1, 2])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
889 >>> G.add_edge(2, 3, weight=5)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
890 >>> [e for e in G.edges]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
891 [(0, 1), (1, 2), (2, 3)]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
892 >>> G.edges.data() # default data is {} (empty dict)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
893 OutEdgeDataView([(0, 1, {}), (1, 2, {}), (2, 3, {'weight': 5})])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
894 >>> G.edges.data('weight', default=1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
895 OutEdgeDataView([(0, 1, 1), (1, 2, 1), (2, 3, 5)])
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
896 >>> G.edges([0, 2]) # only edges incident to these nodes
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
897 OutEdgeDataView([(0, 1), (2, 3)])
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parents:
diff changeset
898 >>> G.edges(0) # only edges incident to a single node (use G.adj[0]?)
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parents:
diff changeset
899 OutEdgeDataView([(0, 1)])
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parents:
diff changeset
900
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parents:
diff changeset
901 """
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parents:
diff changeset
902 return OutEdgeView(self)
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parents:
diff changeset
903
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parents:
diff changeset
904 # alias out_edges to edges
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parents:
diff changeset
905 out_edges = edges
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parents:
diff changeset
906
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parents:
diff changeset
907 @property
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parents:
diff changeset
908 def in_edges(self):
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parents:
diff changeset
909 """An InEdgeView of the Graph as G.in_edges or G.in_edges().
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parents:
diff changeset
910
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parents:
diff changeset
911 in_edges(self, nbunch=None, data=False, default=None):
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parents:
diff changeset
912
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parents:
diff changeset
913 Parameters
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parents:
diff changeset
914 ----------
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parents:
diff changeset
915 nbunch : single node, container, or all nodes (default= all nodes)
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parents:
diff changeset
916 The view will only report edges incident to these nodes.
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diff changeset
917 data : string or bool, optional (default=False)
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parents:
diff changeset
918 The edge attribute returned in 3-tuple (u, v, ddict[data]).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
919 If True, return edge attribute dict in 3-tuple (u, v, ddict).
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parents:
diff changeset
920 If False, return 2-tuple (u, v).
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parents:
diff changeset
921 default : value, optional (default=None)
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parents:
diff changeset
922 Value used for edges that don't have the requested attribute.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
923 Only relevant if data is not True or False.
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parents:
diff changeset
924
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parents:
diff changeset
925 Returns
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parents:
diff changeset
926 -------
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parents:
diff changeset
927 in_edges : InEdgeView
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parents:
diff changeset
928 A view of edge attributes, usually it iterates over (u, v)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
929 or (u, v, d) tuples of edges, but can also be used for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
930 attribute lookup as `edges[u, v]['foo']`.
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parents:
diff changeset
931
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parents:
diff changeset
932 See Also
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parents:
diff changeset
933 --------
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parents:
diff changeset
934 edges
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parents:
diff changeset
935 """
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parents:
diff changeset
936 return InEdgeView(self)
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parents:
diff changeset
937
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parents:
diff changeset
938 @property
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parents:
diff changeset
939 def degree(self):
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parents:
diff changeset
940 """A DegreeView for the Graph as G.degree or G.degree().
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parents:
diff changeset
941
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parents:
diff changeset
942 The node degree is the number of edges adjacent to the node.
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parents:
diff changeset
943 The weighted node degree is the sum of the edge weights for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
944 edges incident to that node.
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parents:
diff changeset
945
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parents:
diff changeset
946 This object provides an iterator for (node, degree) as well as
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
947 lookup for the degree for a single node.
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diff changeset
948
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diff changeset
949 Parameters
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diff changeset
950 ----------
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diff changeset
951 nbunch : single node, container, or all nodes (default= all nodes)
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diff changeset
952 The view will only report edges incident to these nodes.
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diff changeset
953
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diff changeset
954 weight : string or None, optional (default=None)
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parents:
diff changeset
955 The name of an edge attribute that holds the numerical value used
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
956 as a weight. If None, then each edge has weight 1.
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parents:
diff changeset
957 The degree is the sum of the edge weights adjacent to the node.
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parents:
diff changeset
958
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diff changeset
959 Returns
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parents:
diff changeset
960 -------
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parents:
diff changeset
961 If a single node is requested
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parents:
diff changeset
962 deg : int
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parents:
diff changeset
963 Degree of the node
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parents:
diff changeset
964
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diff changeset
965 OR if multiple nodes are requested
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parents:
diff changeset
966 nd_iter : iterator
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diff changeset
967 The iterator returns two-tuples of (node, degree).
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parents:
diff changeset
968
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parents:
diff changeset
969 See Also
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parents:
diff changeset
970 --------
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diff changeset
971 in_degree, out_degree
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parents:
diff changeset
972
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parents:
diff changeset
973 Examples
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diff changeset
974 --------
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diff changeset
975 >>> G = nx.DiGraph() # or MultiDiGraph
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parents:
diff changeset
976 >>> nx.add_path(G, [0, 1, 2, 3])
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parents:
diff changeset
977 >>> G.degree(0) # node 0 with degree 1
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diff changeset
978 1
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diff changeset
979 >>> list(G.degree([0, 1, 2]))
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parents:
diff changeset
980 [(0, 1), (1, 2), (2, 2)]
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parents:
diff changeset
981
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parents:
diff changeset
982 """
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parents:
diff changeset
983 return DiDegreeView(self)
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parents:
diff changeset
984
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diff changeset
985 @property
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parents:
diff changeset
986 def in_degree(self):
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parents:
diff changeset
987 """An InDegreeView for (node, in_degree) or in_degree for single node.
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parents:
diff changeset
988
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diff changeset
989 The node in_degree is the number of edges pointing to the node.
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diff changeset
990 The weighted node degree is the sum of the edge weights for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
991 edges incident to that node.
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diff changeset
992
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diff changeset
993 This object provides an iteration over (node, in_degree) as well as
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
994 lookup for the degree for a single node.
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parents:
diff changeset
995
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996 Parameters
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997 ----------
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diff changeset
998 nbunch : single node, container, or all nodes (default= all nodes)
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diff changeset
999 The view will only report edges incident to these nodes.
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diff changeset
1000
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diff changeset
1001 weight : string or None, optional (default=None)
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parents:
diff changeset
1002 The name of an edge attribute that holds the numerical value used
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parents:
diff changeset
1003 as a weight. If None, then each edge has weight 1.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
1004 The degree is the sum of the edge weights adjacent to the node.
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diff changeset
1005
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diff changeset
1006 Returns
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diff changeset
1007 -------
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diff changeset
1008 If a single node is requested
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diff changeset
1009 deg : int
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diff changeset
1010 In-degree of the node
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diff changeset
1011
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diff changeset
1012 OR if multiple nodes are requested
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diff changeset
1013 nd_iter : iterator
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diff changeset
1014 The iterator returns two-tuples of (node, in-degree).
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diff changeset
1015
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1016 See Also
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1017 --------
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diff changeset
1018 degree, out_degree
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diff changeset
1019
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1020 Examples
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1021 --------
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diff changeset
1022 >>> G = nx.DiGraph()
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diff changeset
1023 >>> nx.add_path(G, [0, 1, 2, 3])
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diff changeset
1024 >>> G.in_degree(0) # node 0 with degree 0
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diff changeset
1025 0
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diff changeset
1026 >>> list(G.in_degree([0, 1, 2]))
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parents:
diff changeset
1027 [(0, 0), (1, 1), (2, 1)]
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diff changeset
1028
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1029 """
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1030 return InDegreeView(self)
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1031
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diff changeset
1032 @property
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1033 def out_degree(self):
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parents:
diff changeset
1034 """An OutDegreeView for (node, out_degree)
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diff changeset
1035
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1036 The node out_degree is the number of edges pointing out of the node.
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parents:
diff changeset
1037 The weighted node degree is the sum of the edge weights for
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1038 edges incident to that node.
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1039
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1040 This object provides an iterator over (node, out_degree) as well as
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1041 lookup for the degree for a single node.
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1042
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1043 Parameters
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1044 ----------
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1045 nbunch : single node, container, or all nodes (default= all nodes)
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1046 The view will only report edges incident to these nodes.
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1047
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1048 weight : string or None, optional (default=None)
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1049 The name of an edge attribute that holds the numerical value used
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1050 as a weight. If None, then each edge has weight 1.
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1051 The degree is the sum of the edge weights adjacent to the node.
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1052
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1053 Returns
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1054 -------
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1055 If a single node is requested
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1056 deg : int
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1057 Out-degree of the node
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1058
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1059 OR if multiple nodes are requested
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1060 nd_iter : iterator
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1061 The iterator returns two-tuples of (node, out-degree).
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1062
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1063 See Also
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1064 --------
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1065 degree, in_degree
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1066
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1067 Examples
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1068 --------
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1069 >>> G = nx.DiGraph()
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parents:
diff changeset
1070 >>> nx.add_path(G, [0, 1, 2, 3])
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1071 >>> G.out_degree(0) # node 0 with degree 1
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1072 1
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1073 >>> list(G.out_degree([0, 1, 2]))
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1074 [(0, 1), (1, 1), (2, 1)]
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1075
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1076 """
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1077 return OutDegreeView(self)
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1078
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1079 def clear(self):
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1080 """Remove all nodes and edges from the graph.
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1081
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1082 This also removes the name, and all graph, node, and edge attributes.
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1083
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1084 Examples
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1085 --------
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1086 >>> G = nx.path_graph(4) # or DiGraph, MultiGraph, MultiDiGraph, etc
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1087 >>> G.clear()
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1088 >>> list(G.nodes)
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1089 []
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1090 >>> list(G.edges)
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1091 []
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1092 """
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1093 self._succ.clear()
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1094 self._pred.clear()
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1095 self._node.clear()
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1096 self.graph.clear()
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1097
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1098 def is_multigraph(self):
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diff changeset
1099 """Returns True if graph is a multigraph, False otherwise."""
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1100 return False
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1101
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1102 def is_directed(self):
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1103 """Returns True if graph is directed, False otherwise."""
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1104 return True
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diff changeset
1105
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1106 def to_undirected(self, reciprocal=False, as_view=False):
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1107 """Returns an undirected representation of the digraph.
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1108
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1109 Parameters
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1110 ----------
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1111 reciprocal : bool (optional)
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1112 If True only keep edges that appear in both directions
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1113 in the original digraph.
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1114 as_view : bool (optional, default=False)
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1115 If True return an undirected view of the original directed graph.
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1116
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1117 Returns
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1118 -------
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1119 G : Graph
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1120 An undirected graph with the same name and nodes and
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parents:
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1121 with edge (u, v, data) if either (u, v, data) or (v, u, data)
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1122 is in the digraph. If both edges exist in digraph and
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1123 their edge data is different, only one edge is created
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1124 with an arbitrary choice of which edge data to use.
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1125 You must check and correct for this manually if desired.
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1126
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1127 See Also
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1128 --------
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1129 Graph, copy, add_edge, add_edges_from
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1130
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1131 Notes
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1132 -----
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1133 If edges in both directions (u, v) and (v, u) exist in the
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1134 graph, attributes for the new undirected edge will be a combination of
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1135 the attributes of the directed edges. The edge data is updated
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1136 in the (arbitrary) order that the edges are encountered. For
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diff changeset
1137 more customized control of the edge attributes use add_edge().
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1138
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1139 This returns a "deepcopy" of the edge, node, and
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1140 graph attributes which attempts to completely copy
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1141 all of the data and references.
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1142
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1143 This is in contrast to the similar G=DiGraph(D) which returns a
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1144 shallow copy of the data.
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1145
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1146 See the Python copy module for more information on shallow
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1147 and deep copies, https://docs.python.org/2/library/copy.html.
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1148
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1149 Warning: If you have subclassed DiGraph to use dict-like objects
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diff changeset
1150 in the data structure, those changes do not transfer to the
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1151 Graph created by this method.
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1152
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1153 Examples
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1154 --------
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1155 >>> G = nx.path_graph(2) # or MultiGraph, etc
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parents:
diff changeset
1156 >>> H = G.to_directed()
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diff changeset
1157 >>> list(H.edges)
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1158 [(0, 1), (1, 0)]
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1159 >>> G2 = H.to_undirected()
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1160 >>> list(G2.edges)
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1161 [(0, 1)]
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1162 """
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1163 graph_class = self.to_undirected_class()
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1164 if as_view is True:
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1165 return nx.graphviews.generic_graph_view(self, Graph)
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1166 # deepcopy when not a view
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1167 G = Graph()
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1168 G.graph.update(deepcopy(self.graph))
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1169 G.add_nodes_from((n, deepcopy(d)) for n, d in self._node.items())
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1170 if reciprocal is True:
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1171 G.add_edges_from((u, v, deepcopy(d))
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1172 for u, nbrs in self._adj.items()
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1173 for v, d in nbrs.items()
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1174 if v in self._pred[u])
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1175 else:
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1176 G.add_edges_from((u, v, deepcopy(d))
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1177 for u, nbrs in self._adj.items()
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1178 for v, d in nbrs.items())
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1179 return G
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1180
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1181 def reverse(self, copy=True):
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1182 """Returns the reverse of the graph.
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1183
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1184 The reverse is a graph with the same nodes and edges
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1185 but with the directions of the edges reversed.
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1186
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1187 Parameters
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1188 ----------
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1189 copy : bool optional (default=True)
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1190 If True, return a new DiGraph holding the reversed edges.
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1191 If False, the reverse graph is created using a view of
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1192 the original graph.
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1193 """
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1194 if copy:
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1195 H = self.__class__()
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1196 H.graph.update(deepcopy(self.graph))
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1197 H.add_nodes_from((n, deepcopy(d)) for n, d in self.nodes.items())
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1198 H.add_edges_from((v, u, deepcopy(d)) for u, v, d
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1199 in self.edges(data=True))
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1200 return H
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1201 return nx.graphviews.reverse_view(self)