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Extra information
-----------------
.. currentmodule:: objgraph
You can add extra information to object graphs, if you desire. For example,
let's add object IDs:
>>> x = []
>>> y = [x, [x], dict(x=x)]
>>> import objgraph
>>> objgraph.show_refs([y], extra_info=lambda x: hex(id(x)),
... filename='extra-info.png')
Graph written to ....dot (... nodes)
Image generated as extra-info.png
.. figure:: extra-info.png
This way you can then look them up later with :func:`at`, if you desire to
get a closer look at a particular object:
>>> objgraph.at(id(x)) is x
True
Warning: this doesn't work with strings or ints or other simple types
that aren't tracked by the cyclic garbage collector:
>>> a = 'a string'
>>> objgraph.at(id(a))
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