I am trying to run a test using python_tests. When I run it I get an error: pex: error: unrecognized arguments. How do I get rid of the error and run my test?

Sorry you’re having trouble. We would need a LOT more information to help you with this. The best thing is a small repo we can clone that exhibits the problem (and whose README describes what you’re running, what you expect to happen, and what actually happens)