Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/networkx/utils/contextmanagers.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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2 from contextlib import contextmanager
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3
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4 __all__ = [
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5 'reversed',
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6 ]
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9 @contextmanager
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10 def reversed(G):
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11 """A context manager for temporarily reversing a directed graph in place.
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12
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13 This is a no-op for undirected graphs.
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14
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15 Parameters
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16 ----------
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17 G : graph
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18 A NetworkX graph.
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19 """
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20 directed = G.is_directed()
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21 if directed:
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22 G._pred, G._succ = G._succ, G._pred
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23 G._adj = G._succ
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24
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25 try:
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26 yield
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27 finally:
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28 if directed:
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29 # Reverse the reverse.
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30 G._pred, G._succ = G._succ, G._pred
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31 G._adj = G._succ