python

Divvy is a Python backtester that replays your real contribution dates and amounts into a counterfactual portfolio, dividends included.

Stamp Grader measures centering from a photo with classical CV, draws the result on your image, and treats cannot-determine as a valid answer.

The test of a protocol is a second implementation that forces no change. I added Python, then Go, to Packkit and used the exceptions to find where my abstraction actually leaked.