Run python 2.7 and 3 remotely for wrapper

I installed python 2.7.10 on mac but now I want to go with Python 3 to use a python wrapper for API.

I am managing folders in below manner.

apps/ nameofapp/ app.py gracenote/ pygn.py

Python wrapper refers pygn.py where Python 3 involvement is required and Python 2.7 is necessary for app.py

How to run a Python remotely for the wrapper?