Mercurial > repos > guerler > springsuite
comparison planemo/lib/python3.7/site-packages/networkx/utils/contextmanagers.py @ 1:56ad4e20f292 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
| author | guerler |
|---|---|
| date | Fri, 31 Jul 2020 00:32:28 -0400 |
| parents | |
| children |
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| 0:d30785e31577 | 1:56ad4e20f292 |
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| 1 | |
| 2 from contextlib import contextmanager | |
| 3 | |
| 4 __all__ = [ | |
| 5 'reversed', | |
| 6 ] | |
| 7 | |
| 8 | |
| 9 @contextmanager | |
| 10 def reversed(G): | |
| 11 """A context manager for temporarily reversing a directed graph in place. | |
| 12 | |
| 13 This is a no-op for undirected graphs. | |
| 14 | |
| 15 Parameters | |
| 16 ---------- | |
| 17 G : graph | |
| 18 A NetworkX graph. | |
| 19 """ | |
| 20 directed = G.is_directed() | |
| 21 if directed: | |
| 22 G._pred, G._succ = G._succ, G._pred | |
| 23 G._adj = G._succ | |
| 24 | |
| 25 try: | |
| 26 yield | |
| 27 finally: | |
| 28 if directed: | |
| 29 # Reverse the reverse. | |
| 30 G._pred, G._succ = G._succ, G._pred | |
| 31 G._adj = G._succ |