I've been tinkering with a simple CLI tool for viewing & querying data files (CSV, Parquet, etc.). The most recent feature is the ability to view Parquet row group metadata.
There are more capable tools out there for sure, but this is really coming in handy during my day-to-day work.
Also, writing simple CLI tools is oddly satisfying.
@andygrove nice! we had similar needs for this library https://github.com/DerwenAI/pynock though it's focused on representing data for scalable graph compute