I dont think they can yet interopt. I would try zeromq there is some example code for both. Julia is improving rapidly and it has lots of tools, but only for data analysis. If you want create a web service for exampe you are better off with Python.
I meant that the problem is calling Julia from Python. Thus the webservice example. Python makes it easier to have a frontend, in flask or django and it would be nice if you could call Julia background services easier.
By interopt, I meant calling python functions like they are julia functions.