Announcing a project hosted on GitHub called nose2pytest ( https://github.com/schollii/nose2pytest). This project helps migrate a test suite that was written for Nose to work with pure pytest. It converts nose.tools.assert_ functions into raw assert statements so you can better (IMO) leverage pytest assertion introspection. It may even decrease test suite dependencies by 1; after nose2test has been run on a test suite, it is no longer needed.
The nose2pytest script has already successfully converted approximately 5000 assertions, so this is v1.0. However, there are many ways to harness Nose functionality so I'm really curious to see if nose2test can be useful to others.
I'm sure there is lots of room for improvement. Any feedback or contributions would be much appreciated.