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.

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? — Sidharth Shah, Mar 27 '13 at 14:33
I dont know if i have used virtulenv. How to check if i have installed pyhraphviz and python on the same environment? — Sashko Lykhenko, Mar 27 '13 at 14:36
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, Mar 27 '13 at 14:40
Also take a look at this nice [Tutorial](http://www.clemesha.org/blog/modern-python-hacker-tools-virtualenv-fabric-pip/) on pip and virtualenv when you have time. — Sidharth Shah, Mar 27 '13 at 14:44
I dont have pip installed. apt-get does not contain it either. And apt-get does not contain virtualenv — Sashko Lykhenko, Mar 27 '13 at 14:48
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/pygraphviz Storing complete log in /home/sashko/.pip/pip.log — Sashko Lykhenko, Mar 27 '13 at 15:09
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. — Sidharth Shah, Mar 27 '13 at 15:38
yes, i did sudo apt-get install graphviz before doing pip install pygraphviz. — Sashko Lykhenko, Mar 27 '13 at 15:40
How to find out where "graphviz" was installed? And were it should be installed so that pyhraphviz setup.py could find it? — Sashko Lykhenko, Mar 27 '13 at 15:44
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'` — Sidharth Shah, Mar 27 '13 at 15:51

score 129 · Accepted Answer · edited Jul 11 '13 at 19:12

129

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

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

edited Jul 11 '13 at 19:12

Sean

1,907
15
23

answered Mar 27 '13 at 19:40

Sidharth Shah

1,469
1
11
14

2

Yes, `pkg-config` is important, otherwise `pip install pygraphviz` will can not be compiled, cause `library_path`. – Honghe.Wu Oct 30 '13 at 02:27
4

`ImportError: undefined symbol: Agundirected `, as described [here](http://stackoverflow.com/questions/32885486/import-pygraphviz-not-working-ubuntu). – SparkAndShine Oct 02 '15 at 14:29
make sure you restart your terminal...so your changes gets affected – sumitkanoje Feb 17 '21 at 11:58

score 19 · Answer 2 · answered Nov 17 '16 at 10:37

19

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/"

answered Nov 17 '16 at 10:37

Alp Celik

231
2
2

1

Thanks for this, also works for me on Ubuntu 16.04 LTS when trying to install pygraphz via pip – rwenz3l Jun 14 '17 at 13:08
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”`. – Chris Jun 25 '18 at 15:07
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` – haku Feb 13 '19 at 23:59
also works in ubuntu 20.04 LTS. I needed this in order to install it .. – Lucas Aimaretto Aug 13 '20 at 20:19

Sean · Answer 3 · 2013-07-11T18:54:45.267

14

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

edited Jul 11 '13 at 18:54

answered Jul 03 '13 at 19:35

Sean

1,907
15
23

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? – CPBL Mar 20 '16 at 20:08
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. – Sean Mar 22 '16 at 16:48
Thanks! For me just installing `python-pygraphviz` fixed the problem – Bretsko Apr 28 '17 at 01:46

score 13 · Answer 4 · edited Oct 26 '16 at 16:35

13

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/]

edited Oct 26 '16 at 16:35

Unis

423
1
3
12

answered Oct 11 '16 at 11:35

Bart Theeten

261
3
5

Worked for me in combination with pydot2 installation + but replace in above instructions 'urs' by 'usr' – Davy Oct 12 '16 at 18:12

score 4 · Answer 5 · answered Nov 15 '16 at 04:41

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/

score 3 · Answer 6 · answered Mar 22 '16 at 20:03

3

Under Ubuntu 15.10+ (ie 2015ish Debian), the quick and easy solution is:

sudo apt-get install python-pygraphviz

Any dependencies are properly pulled by apt.

answered Mar 22 '16 at 20:03

CPBL

2,912
2
24
37

Python does not see pygraphviz

6 Answers6

Linked