o ˷e@s(dZgdZddZddZddZdS) z8 Functions for identifying isolate (degree zero) nodes. ) is_isolateisolatesnumber_of_isolatescCs||dkS)a-Determines whether a node is an isolate. An *isolate* is a node with no neighbors (that is, with degree zero). For directed graphs, this means no in-neighbors and no out-neighbors. Parameters ---------- G : NetworkX graph n : node A node in `G`. Returns ------- is_isolate : bool True if and only if `n` has no neighbors. Examples -------- >>> G = nx.Graph() >>> G.add_edge(1, 2) >>> G.add_node(3) >>> nx.is_isolate(G, 2) False >>> nx.is_isolate(G, 3) True degree)Gnr R/var/www/ideatree/venv/lib/python3.10/site-packages/networkx/algorithms/isolate.pyrsrcCsdd|DS)aIterator over isolates in the graph. An *isolate* is a node with no neighbors (that is, with degree zero). For directed graphs, this means no in-neighbors and no out-neighbors. Parameters ---------- G : NetworkX graph Returns ------- iterator An iterator over the isolates of `G`. Examples -------- To get a list of all isolates of a graph, use the :class:`list` constructor:: >>> G = nx.Graph() >>> G.add_edge(1, 2) >>> G.add_node(3) >>> list(nx.isolates(G)) [3] To remove all isolates in the graph, first create a list of the isolates, then use :meth:`Graph.remove_nodes_from`:: >>> G.remove_nodes_from(list(nx.isolates(G))) >>> list(G) [1, 2] For digraphs, isolates have zero in-degree and zero out_degre:: >>> G = nx.DiGraph([(0, 1), (1, 2)]) >>> G.add_node(3) >>> list(nx.isolates(G)) [3] css |] \}}|dkr|VqdS)rNr ).0rdr r r Rszisolates..rrr r r r(s*rcCstddt|DS)a\Returns the number of isolates in the graph. An *isolate* is a node with no neighbors (that is, with degree zero). For directed graphs, this means no in-neighbors and no out-neighbors. Parameters ---------- G : NetworkX graph Returns ------- int The number of degree zero nodes in the graph `G`. css|]}dVqdS)Nr )r vr r r r gsz%number_of_isolates..)sumrrr r r rUsrN)__doc____all__rrrr r r r s  -