Extra information

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

This way you can then look them up later with 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))