Python 3: Installation de gi paquet avec pip

Je suis en train de lancer cette Matplotlib exemple à l'aide de Python 3. Pour exécuter ce que je nécessaire à l'installation de gi première (je suis en utilisant pyenv):

$ python --version
Python 3.6.1
$ pip --version
pip 9.0.1 from /home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages (python 3.6)
$ pip install gi
Collecting gi
Downloading gi-1.2.tar.gz
Collecting requests (from gi)
Downloading requests-2.16.0-py2.py3-none-any.whl (85kB)
100% |████████████████████████████████| 92kB 959kB/s 
Collecting idna<2.6,>=2.5 (from requests->gi)
Downloading idna-2.5-py2.py3-none-any.whl (55kB)
100% |████████████████████████████████| 61kB 1.2MB/s 
Collecting chardet<3.1.0,>=3.0.2 (from requests->gi)
Downloading chardet-3.0.3-py2.py3-none-any.whl (133kB)
100% |████████████████████████████████| 143kB 1.8MB/s 
Collecting urllib3<1.22,>=1.21.1 (from requests->gi)
Downloading urllib3-1.21.1-py2.py3-none-any.whl (131kB)
100% |████████████████████████████████| 133kB 1.8MB/s 
Collecting certifi>=2017.4.17 (from requests->gi)
Downloading certifi-2017.4.17-py2.py3-none-any.whl (375kB)
100% |████████████████████████████████| 378kB 284kB/s 
Installing collected packages: idna, chardet, urllib3, certifi, requests, gi
Running setup.py install for gi ... done
Successfully installed certifi-2017.4.17 chardet-3.0.3 gi-1.2 idna-2.5 requests-2.16.0 urllib3-1.21.1

Maintenant, l'exécution de l'exemple:

$ python toolmanager.py 
Traceback (most recent call last):
File "./toolmanager.py", line 8, in <module>
import matplotlib.pyplot as plt
File "/home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages/matplotlib/pyplot.py", line 115, in <module>
_backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
File "/home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup
globals(),locals(),[backend_name],0)
File "/home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3cairo.py", line 6, in <module>
from . import backend_gtk3
File "/home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages/matplotlib/backends/backend_gtk3.py", line 10, in <module>
import gi
File "/home/hakon/.pyenv/versions/3.6.1/lib/python3.6/site-packages/gi/__init__.py", line 39
print url
^
SyntaxError: Missing parentheses in call to 'print'

Semble pip réussi à installer un Python 2 version? Comment puis-je résoudre ce problème?