That's not even a poor man's enum, it's just an enum. Named tuples can be used for everything an enum can be. This doesn't seem like a necessary PEP, but I've made my peace a long time ago about Python's bloated standard library. It's not the end of the world, and I still love Python, but this doesn't seem necessary to me.
You don't have methods and you don't have a proper repr(). Also, even if you don't assign numbers, the fields are still ordered (which they shouldn't be).
