pylint #3190 python version compatibility tests [open]

It would be nice if pylint could tell me if I'm using python constructs which are not available in python release older than a given version (e.g. use of the set builtin, use of metaclasses...).

An interface for this could use a flag --python-compat=X.Y which would generate Errors for constructs not available in pythonX.Y, and Warnings for constructs deprecated in that version of python.