I am using pycharm and it only lets you use one interpreter for example Python 2.7.5 or Python 3.5.1.
The problem is I have certain modules one from google to access
This is actually possible with a bit of hacking.
$PROJECT/.idea/modules.xml
and add another module with a different name like this:$PROJECT/.idea
.Caveat: This is a hack which has no GUI in pycharm. This could stop working at any upgrade to pycharm. However, I don't think it will for various reasons.