clean: Add a rstrip utility function.
clean: Add a rstrip utility function.

jonathanverner/brython,jonathanverner/brython,brython-dev/brython,jonathanverner/brython,jonathanverner/brython,brython-dev/brython,kikocorreoso/brython,brython-dev/brython,kikocorreoso/brython,kikocorreoso/brython