How to get process priority in python

Right now, I m using psutil.nice() function in for process in psutil.process_iter() loop. If I try to campare priority like this:

if process.nice() != psutil.HIGH_PRIORITY_CLASS:
     do something..

It does not work. So my question is: How to compare process priority in python using psutil? Thanks for all answers and have a noce evening :)