ezr labels a few rows, grows a tiny tree, and lets that tree explain the rest. Two files, no dependencies: ezr.py (the library and its demos) and ezr_eg.py (clustering and optimizer demos). Start with the map, then read whichever tutorial matches what puzzles you.

The code

• Map — every section, signature, and the call graph; regenerated from source, so it cannot rot.

Tutorials

• Python idioms — twelve idioms that puzzle newcomers, easiest first.
• Maths idioms — Welford, z-scores, entropy, Minkowski: ten pieces of maths, each in three lines.
• AI ideas — nine big ideas (labels are dear, discretization, active learning ...), real-world first, then the code.
• SE ideas — eleven software-engineering ideas hiding in tiny code (SSOT, little languages, golden masters ...).
• Script patterns — how one file keeps config, tests, docs and CLI in sync forever.

Try it

pip install ezr
ezr --help          # settings and demos
ezr --tree          # label 50 rows, explain 398
ezr-eg --optimize   # 1983 SA vs local search