birdseye is a unique and powerful debugger that lets you see the value of every individual expression:

_{(Click thumbnails to expand them)}

snoop is a simple convenient debugger that logs everything a function is doing:

It's based oncool-RR/PySnooper for whichI made many major contributions and am a collaborator.

heartrate visualises execution in real time:

stack_data extracts data from stack frames and tracebacks, particularly to display more useful tracebacks than the default.

I usedstack_data tooverhaul tracebacks inIPython, adding several fixes and enhancements. In particularstack_data usesexecuting (see Magic section) to highlight the precise operation which failed:

stack_data is also used to show excellent beginner-friendly tracebacks infuturecoder:

I added anintegration for theSentry Python client to provide more information in tracebacks in error reports. It uses my librarypure_eval, which evaluates simple expressions such as attributes while guaranteeing that no potentially problematic code is executed.pure_eval is also used bystack_data.

I usegristlabs/asttokens inall the projects mentioned above! I've mademany significant contributions to it.

instant_api is more metaprogramming, but based on type hints. It lets you instantly create a Flask API with automatic type conversions, JSON RPC, and a Swagger UI. No other library makes this so convenient. Inspired by FastAPI.

s3-stream-upload lets you efficiently stream large amounts of data to AWS S3 in Java.

SunHours is a SketchUp plugin written in Ruby used by architects around the world to analyse and visualise how much sunlight hits a surface. (repo)

Quiggles is an Android app written in Kotlin that lets anyone draw beautiful animated patterns with ease. Watch a quick demo (1:31). (repo)