Here's an example from difflib import ndiff def main(): x = '\tx\t=\ty\n\t \t \t^' y = '\tx\t=\ty\n\t \t \t^\n' print('\n'.join( line.rstrip('\n') for line in ndiff(x.splitlines(True), y.splitlines(True))) ) if __name__ == '__main__': exit(main()) Current output: $ python3.8 t.py	x	=	y -	^ +	^ ? + Expected output: $ ./python t.py	x	=	y -	^ +	^ ? + Found this while implementing a similar thing for flake8 here: https://gitlab.com/pycqa/flake8/merge_requests/339 and while debugging with pytest

This seems like a reasonable suggestion to me. Am not sure whether it should be backported. Tim, what do you think?

That's actually a good point, I don't think this should land in python3.7 since it changes outuput -- I'm removing that from the versions (though the bug does affect every version I have access to)