Install python igraph on mac

Question

I executed the brew install homebrew/science/igraph When I execute sudo pip3 install python-igraph, I got the following error

Cannot find the C core of igraph on this system using pkg-config.
We will now try to download and compile the C core from scratch.
Version number of the C core: 0.7.1.post6
We will also try: 0.7.1

Using temporary directory: /private/tmp/pip-build-35vcjf7l/python-igraph/tmp/igraph.4cz7yjcl
Downloading igraph-0.7.1.tar.gz... 0.28%error: <urlopen error retrieval incomplete: got only 992 out of 2967134 bytes>

Can anyone help? Many thanks

Now I install directly by sudo pip3 install pypi.python.org/packages/source/p/python-igraph/… — Icarus
– Icarus, Commented Aug 14, 2017 at 4:01

Lucas Roberts · Accepted Answer · 2017-09-21 03:55:21Z

4

Note this post assumes you have homebrew installed and are trying to install on a Mac.

To avoid any issues of python3/python2 I would recommend using python2 because that is what the igraph library is designed to work with. I executed the following codes on a mac and things worked fine.

Instructions to install igraph on python2, in your terminal execute these lines:

brew install cairo
brew install py2cairo
brew install igraph

Now this last line above line installs the C-core. Final terminal line is:

sudo pip install python-igraph

The above line installs igraph for python2, note these lines take about 2 minutes to complete for me

Next open python2 or idle-from terminal (I used idle).

Mow check in python REPL shell...

import igraph.test
igraph.test.run_tests()

If everything looks ok then you've got igraph in python working for you

Also check this one:

from igraph import *
g = Graph.Famous("petersen")
plot(g)

You should get a nice graphic of the peterson graph (red nodes, small graph)

edited Sep 21, 2017 at 3:55

answered Sep 21, 2017 at 3:48

Lucas Roberts

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11 Comments

A. Attia Over a year ago

I followed your guidelines but I am facing this error :

ImportError: dlopen(/Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so, 2): Symbol not found: _iconv   Referenced from: /Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so   Expected in: flat namespace  in /Users/alexandreattia/Desktop/Work/py27_venv/lib/python2.7/site-packages/igraph/_igraph.so

Do you have any idea how to fix it ?

Lucas Roberts Over a year ago

Do you have homebrew installed and are you on a mac? Rather than the error only, please provide the command you called which created the error, this will help me help you.

A. Attia Over a year ago

Yes I am on Mac (High Sierra), I have homebrew (1.3.6). This error was created when I run on python 2.7 import igraph. Thank you very much

Lucas Roberts Over a year ago

Hmm, first thing I would do is look at the log from when homebrew installed igraph on your machine. My first guess is that the location homebrew is using is different from the location that your python 2.7 environment is using.

Lucas Roberts Over a year ago

The easiest way to fix this is to use the python environment that is used by homebrew rather than the other option. To do this you would invoke with a simple python call in the terminal to get a REPL shell.

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