This site has been around for a very long time, but I checked it the other day and was delighted to see that it's almost entirely green now.
On the side note, glad to know that my small effort (I operate that site) is useful for people I highly respect.
I was very surprised when I saw it on HN front page today.
(Which is a shame, graphite is something that always feels older than it should be.)
Carbon has Python 3 support in Github, it just hasn't been released to pypi yet. https://github.com/graphite-project/carbon/blob/master/setup...