Python does not see pygraphviz

Question

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.

Solution 1

Assuming that you're on Ubuntu please look at following steps

1. sudo apt-get install graphviz libgraphviz-dev pkg-config
2. Create and activate virtualenv if needed. The commands looks something like sudo apt-get install python-pip python-virtualenv
3. Run pip install pygraphviz
4. Run terminal and check by importing and see if it works

Solution 2

On Ubuntu 14.04, there is a problem in auto detecting graphviz library and include files. If you follow the steps below probably you'll be safe.

1) sudo apt-get install graphviz libgraphviz-dev pkg-config python-pip
2) pip install pygraphviz --install-option="--include-path=/usr/include/graphviz" --install-option="--library-path=/usr/lib/graphviz/" 

Solution 3

The quick and easy solution is:

sudo apt-get install -y python-pygraphviz

using pip will also work, but make sure you have graphviz, libgraphviz-dev, and pkg-config already installed.

sudo apt-get install -y graphviz libgraphviz-dev pkg-config python-pip
sudo pip install pygraphviz

Solution 4

On Mac OSX, the following did the trick for me:

pip install graphviz
pip install cgraph
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig 
cd /usr/local/include/graphviz 
sudo ln -s . graphviz 
pip install pygraphviz

[As suggested, fixed typo from previously /urs/local/ to /usr/local/]

Solution 5

On Mac OSX El Capitan, Bart Theeten's solution works but there are two things you need to be careful. Initially, make sure that you installed graphviz on your computer. You can use homebrew:

brew install graphviz

Other thing is to make sure you add the path of packages to PYTHONPATH

export PYTHONPATH=$PYTHONPATH:/usr/local/lib/python2.7/site-packages/

View more solutions

Comments

[Sidharth Shah]

Have you used virtulenv, if so can you please confirm if the environment on which you installed the package is the same from which you may be calling script or invoking shell?

[Sashko Lykhenko]

I dont know if i have used virtulenv. How to check if i have installed pyhraphviz and python on the same environment?

[Sashko Lykhenko]

I just typed easy_install pyhraphviz

[Sidharth Shah]

Ok do the following in your gnoe-terminal 1. pip install virtualenv 2. virtualenv myenv 3. source myenv/bin/activate 4. pip install pygraphviz Then run python and try import pygraphviz as check if it works.

[Sidharth Shah]

Also take a look at this nice Tutorial on pip and virtualenv when you have time.

[Sashko Lykhenko]

I dont have pip installed. apt-get does not contain it either. And apt-get does not contain virtualenv

[Sidharth Shah]

Try sudo apt-get install python-pip python-virtualenv

[Sashko Lykhenko]

After "pip install pygraphviz": Command python setup.py egg_info failed with error code 1 in /home/sashko/src/webkit2/webkit/Tools/Scripts/myenv/build/py‌​graphviz Storing complete log in /home/sashko/.pip/pip.log

[Sashko Lykhenko]

OSError: Error locating graphviz.

[Sidharth Shah]

Just curios did you do sudo apt-get install graphviz before you're doing pip install pygraphviz. In my case I was missing that, on my local VM.

[Sashko Lykhenko]

yes, i did sudo apt-get install graphviz before doing pip install pygraphviz.

[Sashko Lykhenko]

How to find out where "graphviz" was installed? And were it should be installed so that pyhraphviz setup.py could find it?

[Sidharth Shah]

Ok I figure the issue. You might be missing libgraphviz-dev. You can install it using sudo apt-get install libgraphviz-dev. You can check if graphviz is installed using dpkg -l | grep 'graphviz'

[Sashko Lykhenko]

Worked! Will it work only in myenv?

[Sidharth Shah]

Yes it would. Give it a try.

[Honghe.Wu]

Yes, pkg-config is important, otherwise pip install pygraphviz will can not be compiled, cause library_path.

[SparkAndShine]

ImportError: undefined symbol: Agundirected , as described here.

[CPBL]

Why are these needed? Installing (and using) python-pygraphviz seemed to work fine for me without libgraphviz-dev. Why then is this needed in advance if its not an explicit dependency, and why the others?

[Sean]

this was answered almost 3 years ago, its possible that they've changed how pygraphviz is packaged by now so that this is not all necessary. If that's the case, you should post an answer here to that effect.

[Davy]

Worked for me in combination with pydot2 installation + but replace in above instructions 'urs' by 'usr'

[Bretsko]

Thanks! For me just installing python-pygraphviz fixed the problem

[rwenz3l]

Thanks for this, also works for me on Ubuntu 16.04 LTS when trying to install pygraphz via pip

[Chris]

These install options also worked for me experiencing the same error on macOS (having run brew install graphviz), except the path was /usr/local/include/graphviz and the lib was /usr/local/lib/graphviz, so full command was: pip3.6 install pygraphviz --install-option="--include-path=/usr/local/include/graphviz‌​/" --install-option="--library-path=/usr/local/lib/graphviz”.

[haku]

On Ubuntu 18.04, I could pull it off with just sudo apt-get install graphviz libgraphviz-dev graphviz-dev followed by pip install pygraphviz

[Lucas Aimaretto]

also works in ubuntu 20.04 LTS. I needed this in order to install it ..

[sumitkanoje]

make sure you restart your terminal...so your changes gets affected

[alxlives]

Thank you for this, was the only solution that worked. Just needed to change GRAPHVIZ_DIR to my local HomeBrew path