I have download the Poppy.img for Raspberry-pi (which come from the last release on github) and the python version which use this img is Python 2.7, but when we download the “poppy-services” for use on PC (Mac or Windows) for the simulation with V-Rep, the Python Version are the 3.5.1. It is normal ?
What are you talking about when you say "when we download the “poppy-services” ? Poppy software libraries works in Python 2.7 and 3.3+, but we doesn’t install Python, so the Python version depends on what you have done in the installation process.