CODEWITHSUNDEEP
python
Ihor Berizka
Ihor Berizka

Reputation: 31

ModuleNotFoundError: No module named 'graph_tool'

I am new in graph_tool. I have installed this library using this tutorial. Then I launched idle (Python 3) and tried to import it, but got this error:

Traceback (most recent call last):
File "/home/ihor/CS/Python_lessons/graph_tool_test.py", line 1, in <module>
    from graph_tool.all import *
ModuleNotFoundError: No module named 'graph_tool'

Upvotes: 2

Views: 9654

Answers (2)

Francesco De Collibus
Francesco De Collibus

Reputation: 49

With Brew try the following commands:

brew tap brewsci/bio
brew tap brewsci/science
brew install graph-tool

With anaconda:

conda config --add channels vgauthier --add channels rwest

conda install graph-tool

Upvotes: -1

Ole Henrik Skogstr&#248;m
Ole Henrik Skogstr&#248;m

Reputation: 6493

If you are using virtualenv (or pyenv virtualenv) on a Mac, then this worked for me. You essentially need to put graph-tool into the right package directory. As brew and other installers target the incorrect folder. Here is a guide:

First, locate where graph-tool was actually installed:

brew info graph-tool
graph-tool: stable 2.43
Efficient network analysis for Python 3
https://graph-tool.skewed.de/
/usr/local/Cellar/graph-tool/2.43 (2,077 files, 576.8MB) *
... The rest bellow here is irrelevant...

Here you can see that graph-tool was installed here at /usr/local/Cellar/graph-tool/2.43

Now dig into the /lib folder here and locate the site-packages folder inside the relevant python version. Mine was:

/usr/local/Cellar/graph-tool/2.43/lib/python3.9/site-packages/graph_tool

Secondly locate where your python packages usually are. You can do this by entering the Python terminal, importing a package and then calling __file__ on it. Example:

>>>> import pandas as pd
>>>> pd.__file__
'/Users/some_user/.pyenv/versions/my_project/lib/python3.9/site-packages/pandas/__init__.py'

You can now see that your packages installed with pip are located in: /Users/some_user/.pyenv/versions/my_project/lib/python3.9/site-packages

All you need to do is to add graph_tool to this folder through a symlink. Like so ln-s <graph-tool-packages-directory> <vitrualenv-packages-directory>. Example:

ln -s /usr/local/Cellar/graph-tool/2.43/lib/python3.9/site-packages/graph_tool /Users/some_user/.pyenv/versions/my_project/lib/python3.9/site-packages

There might be much better ways of doing this, but this worked for me.

Upvotes: 6

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