According to https://docs.python.org/2.7/library/pkgutil.html#pkgutil.iter_modules and https://docs.python.org/3/library/pkgutil.html#pkgutil.iter_modules: "path should be either None or a list of paths to look for modules in."
* py3 done (py2 pass empty) * remove dangling importlib * importlib.abc only exists in py3