python 3 and undefined name for builtins

by George Y. Kussumoto

I was testing something using python3x when I realize that flake8/pep8 always warn me about an "[W802] undefined name".

Very annoying and I could not find anything to fix that without remove the warning (entirely).

In the meanwhile, I'm importing from the builtins module just to make them happy. For example:

from builtins import FileNotFoundError