import pydot
Couldn't import dot_parser, loading of dot files will not be possible.
http://code.google.com/p/pydot/
pip install -U pydot pyparsing==1.5.7
pydot-1.0.28 python setup.py install
http://answers.ros.org/question/64133/cant-install-pydot-on-macbook-pro-os-1083/
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