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comparison env/lib/python3.7/site-packages/networkx/utils/contextmanagers.py @ 5:9b1c78e6ba9c draft default tip

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"planemo upload commit 6c0a8142489327ece472c84e558c47da711a9142"
author shellac
date Mon, 01 Jun 2020 08:59:25 -0400
parents 79f47841a781
children
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4:79f47841a781 5:9b1c78e6ba9c
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