NameError when trying to import indigo_renderer

[trinh...@gmail.com]

Hi, I have a mac with python3.6 venv installed. I downloaded the binaries from website and moved into the site-packages directory of python. I think that is the appropriate step in regards to installation. When I import indigo it is fine, but when I import indigo_renderer it gives me NameError 'os' not defined. Not sure why this is happening. These are the two import statements: 

from indigo.indigo import *

from indigo.indigo_renderer import *

Seems that I did not install correctly since I am writing indigo.indigo; I'm uncertain whether this is the correct way. I would greatly appreciate any help and/or assistance. Thanks.