Ask HN: Python environment to chart data, as seen in HN

I am desperately trying to find a product that someone mentioned here a few weeks ago (maybe a month or two).

It was part of a "Show HN" discussion and was given as an alternative to the submitted product (as a comment, with a few "great!" comments afterwards).

It was a self hosted web engine that was displaying charts based on python data (so one child use pandas &co.) and charts were interactive (IIRC).

I have been searching and searching (including my browser history) but cannot find it.

Does this ring a bell?