Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/networkx/utils/contextmanagers.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 from contextlib import contextmanager |
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2 import warnings |
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3 |
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4 __all__ = ["reversed"] |
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5 |
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6 |
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7 @contextmanager |
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8 def reversed(G): |
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9 """A context manager for temporarily reversing a directed graph in place. |
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10 |
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11 This is a no-op for undirected graphs. |
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12 |
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13 Parameters |
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14 ---------- |
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15 G : graph |
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16 A NetworkX graph. |
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17 |
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18 Warning |
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19 ------- |
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20 The reversed context manager is deprecated in favor |
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21 of G.reverse(copy=False). The view allows multiple threads to use the |
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22 same graph without confusion while the context manager does not. |
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23 This context manager is scheduled to be removed in version 3.0. |
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24 """ |
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25 msg = ( |
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26 "context manager reversed is deprecated and to be removed in 3.0." |
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27 "Use G.reverse(copy=False) if G.is_directed() else G instead." |
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28 ) |
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29 warnings.warn(msg, DeprecationWarning) |
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30 |
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31 directed = G.is_directed() |
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32 if directed: |
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33 G._pred, G._succ = G._succ, G._pred |
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34 G._adj = G._succ |
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35 |
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36 try: |
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37 yield |
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38 finally: |
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39 if directed: |
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40 # Reverse the reverse. |
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41 G._pred, G._succ = G._succ, G._pred |
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42 G._adj = G._succ |