Is this just a translator Python->Javascript (which I would expect would have many holes in it) or is it being run by a true Python engine? And if it's run by

Is this just a translator Python->Javascript (which I would expect would have many holes in it) or is it being run by a true Python engine? And if it's run by a true Python engine, does the user have to have Python installed do run it? (Hard for me to tell since all my machines ATM have Python installed).