I have installed pygraphviz using easy_install But when i launch python i have an error:
>>>import pygraphviz as pgv
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named pygraphviz
>>>
Using Ubuntu 12.04 and gnome-terminal.
Assuming that you're on Ubuntu please look at following steps
sudo apt-get install graphviz libgraphviz-dev pkg-config
sudo apt-get install python-pip python-virtualenv
pip install pygraphviz