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Highlighting
------------
You can highlight some graph nodes.
>>> class Node(object):
... def __init__(self, *neighbours):
... self.neighbours = list(neighbours)
>>> a = Node()
>>> b = Node(a)
>>> c = Node(b)
>>> d = Node(c)
>>> a.neighbours.append(d)
>>> import objgraph
>>> objgraph.show_backrefs(a, max_depth=15,
... extra_ignore=[id(locals())],
... highlight=lambda x: isinstance(x, Node),
... filename='highlight.png') # doctest: +NODES_VARY
Graph written to ....dot (12 nodes)
Image generated as highlight.png
.. figure:: highlight.png
:scale: 50%
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