B ,[@s8ddlZddgZd ddZddZdd Zd d dZdS)Nconvert_node_labels_to_integers relabel_nodesTcs>tdsfdd|D}n}|r0t||St||SdS)a$ Relabel the nodes of the graph G. Parameters ---------- G : graph A NetworkX graph mapping : dictionary A dictionary with the old labels as keys and new labels as values. A partial mapping is allowed. copy : bool (optional, default=True) If True return a copy, or if False relabel the nodes in place. Examples -------- To create a new graph with nodes relabeled according to a given dictionary: >>> G = nx.path_graph(3) >>> sorted(G) [0, 1, 2] >>> mapping = {0: 'a', 1: 'b', 2: 'c'} >>> H = nx.relabel_nodes(G, mapping) >>> sorted(H) ['a', 'b', 'c'] Nodes can be relabeled with any hashable object, including numbers and strings: >>> import string >>> G = nx.path_graph(26) # nodes are integers 0 through 25 >>> sorted(G)[:3] [0, 1, 2] >>> mapping = dict(zip(G, string.ascii_lowercase)) >>> G = nx.relabel_nodes(G, mapping) # nodes are characters a through z >>> sorted(G)[:3] ['a', 'b', 'c'] >>> mapping = dict(zip(G, range(1, 27))) >>> G = nx.relabel_nodes(G, mapping) # nodes are integers 1 through 26 >>> sorted(G)[:3] [1, 2, 3] To perform a partial in-place relabeling, provide a dictionary mapping only a subset of the nodes, and set the `copy` keyword argument to False: >>> G = nx.path_graph(3) # nodes 0-1-2 >>> mapping = {0: 'a', 1: 'b'} # 0->'a' and 1->'b' >>> G = nx.relabel_nodes(G, mapping, copy=False) >>> sorted(G, key=str) [2, 'a', 'b'] A mapping can also be given as a function: >>> G = nx.path_graph(3) >>> H = nx.relabel_nodes(G, lambda x: x ** 2) >>> list(H) [0, 1, 4] Notes ----- Only the nodes specified in the mapping will be relabeled. The keyword setting copy=False modifies the graph in place. Relabel_nodes avoids naming collisions by building a directed graph from ``mapping`` which specifies the order of relabelings. Naming collisions, such as a->b, b->c, are ordered such that "b" gets renamed to "c" before "a" gets renamed "b". In cases of circular mappings (e.g. a->b, b->a), modifying the graph is not possible in-place and an exception is raised. In that case, use copy=True. See Also -------- convert_node_labels_to_integers __getitem__csi|]}||qSr).0n)mappingr/lib/python3.7/site-packages/networkx/relabel.py ]sz!relabel_nodes..N)hasattr _relabel_copy_relabel_inplace)Grcopymr)rr r s P  c st|}t|}t||@dkrtt|}|t |yt tt |}Wqtj k rt dYqXn|}| }|}x$|D]y |Wntk rwYnXkrqy|jf|jWn"tk rtdYnX|rbfdd|jdddD}|r|fdd|jdddD7}nFfd d|jdd D}|r|fd d|jdd D7}|||qW|S) Nrz[The node label sets are overlapping and no ordering can resolve the mapping. Use copy=True.zNode %s is not in the graphcs,g|]$\}}}}|krn|||fqSrr)r_targetkeydata)newoldrr sz$_relabel_inplace..T)rkeyscs,g|]$\}}}}|krn|||fqSrr)rsourcerrr)rrrr rscs(g|] \}}}|krn||fqSrr)rrrr)rrrr rs)rcs(g|] \}}}|krn||fqSrr)rrrr)rrrr rs)setrvalueslennxZDiGraphlistitemsZremove_edges_fromZselfloop_edgesreversedZtopological_sortZNetworkXUnfeasible is_multigraphZ is_directedKeyErrorZadd_nodenodesedgesZin_edgesZ remove_nodeadd_edges_from) rrZ old_labelsZ new_labelsDr#Z multigraphZdirectedZ new_edgesr)rrr r fsJ      r cs|}|fdd|D|jfdd|jD|rl|fdd|jdddDn |fdd|jddD|j |j |S) Nc3s|]}||VqdS)N)get)rr)rrr sz _relabel_copy..c3s&|]\}}|||fVqdS)N)r'r)rrd)rrr r(sc3s6|].\}}}}||||||fVqdS)N)r'r)rn1n2kr))rrr r(sT)rrc3s2|]*\}}}|||||fVqdS)N)r'r)rr*r+r))rrr r(s)r) __class__Zadd_nodes_fromZ_nodeupdater#rr!r%r$Zgraph)rrHr)rr r s r defaultc Cs&||}|dkr.tt|t||}n|dkrXt|}tt|t||}n|dkrdd|D}|ttdd|Dt||}nX|dkrdd|D}||ttd d|Dt||}nt d |t ||}|d k r"t |d d | D||S)aYReturn a copy of the graph G with the nodes relabeled using consecutive integers. Parameters ---------- G : graph A NetworkX graph first_label : int, optional (default=0) An integer specifying the starting offset in numbering nodes. The new integer labels are numbered first_label, ..., n-1+first_label. ordering : string "default" : inherit node ordering from G.nodes() "sorted" : inherit node ordering from sorted(G.nodes()) "increasing degree" : nodes are sorted by increasing degree "decreasing degree" : nodes are sorted by decreasing degree label_attribute : string, optional (default=None) Name of node attribute to store old label. If None no attribute is created. Notes ----- Node and edge attribute data are copied to the new (relabeled) graph. There is no guarantee that the relabeling of nodes to integers will give the same two integers for two (even identical graphs). Use the `ordering` argument to try to preserve the order. See Also -------- relabel_nodes r0sortedzincreasing degreecSsg|]\}}||fqSrr)rrr)rrr rsz3convert_node_labels_to_integers..cSsg|] \}}|qSrr)rr)rrrr rszdecreasing degreecSsg|]\}}||fqSrr)rrr)rrr rscSsg|] \}}|qSrr)rr)rrrr rszUnknown node ordering: %sNcSsi|]\}}||qSrr)rr,vrrr r sz3convert_node_labels_to_integers..)Znumber_of_nodesdictzipr#ranger1ZdegreesortreverserZ NetworkXErrorrZset_node_attributesr) rZ first_labelZorderingZlabel_attributeNrZnlistZdv_pairsr/rrr rs*$      )T)rr0N)Znetworkxr__all__rr r rrrrr s  Z3