ModuleNotFoundError: No module named 'gi' - Python - OsX

Question

I am trying to run the following program:

import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject, Gst

Bu I am getting:

Traceback (most recent call last):
File "application.py", line 2, in <module>
import gi
ModuleNotFoundError: No module named 'gi'

I am in a Mac Sierra (10.12.1 (16B2555)) using python3.

I've installed pygoject and gtk+3 (as can be seen here):

(cv) ✔ ~/Documents/test 
00:53 $ brew install pygobject3 --with-python3 gtk+3
Warning: pygobject3 3.24.1_1 is already installed
Warning: gtk+3 3.22.18 is already installed

My python is from my virtualenv:

(cv) ✘-1 ~/Documents/test 
00:53 $ which python
/Users/myuser/.virtualenvs/cv/bin/python


(cv) ✔ ~/Documents/test 
00:54 $ python --version
Python 3.6.1

If I try to uninstall gi to reinstall it (as I saw in some previous answers from Stack) I get:

(cv) ✘-1 ~/Documents/test 
00:55 $ pip uninstall gi
Cannot uninstall requirement gi, not installed

Any idea of what could solve my issue?

Thanks in advance

Answer 1

In my case, as pointed by @NoufalIbrahim, the package was installed in the system directory, but not in the virtualenv.

I have solved the issue by executing:

export PYTHONPATH=/usr/local/lib/python3.6/site-packages