https://github.com/gcovr/gcovr/blob/16c81ccbdbcc43844b991c68a6941ddfcbd9a6a0/scripts/gcovr#L413 this should be `zip` instead of `izip` in python3 http://www.diveintopython3.net/porting-code-to-python-3-with-2to3.html#itertools