How to specify the Python interpreter used?

[khatchad]

I must have some special Python build on my system that isn't working with JEP. However, if I get one off-the-shelf (from apt), it seems to work. Thus, I have multiple Python interpreters on my machine. How do I tell Ariadne which Python interpreter to use? Because my default one doesn't have JEP, but a different one may.. Does it just take whatever is on the PATH?