Installing on Arch-based distro

[ChameleonScales]

I'm trying to install f.lux on an Arch-based distro and it doesn't seem to work.
I ran :

python ./download-xflux.py
python2.7 ./setup.py install

But then when running fluxgui I get :

Traceback (most recent call last):
  File "/usr/bin/fluxgui", line 17, in <module>
    from fluxgui.fluxapp import main
  File "/usr/lib/python2.7/site-packages/fluxgui/fluxapp.py", line 3, in <module>
    from fluxgui import fluxcontroller, settings
  File "/usr/lib/python2.7/site-packages/fluxgui/fluxcontroller.py", line 1, in <module>
    from fluxgui import xfluxcontroller
  File "/usr/lib/python2.7/site-packages/fluxgui/xfluxcontroller.py", line 1, in <module>
    import pexpect
ImportError: No module named pexpect

[ChameleonScales]

Turns out it just had to do with my dependencies only being installed for python 3. I installed those for python 2 and now it works !