pyryte

Next-gen Python type-checker

• 100% conformance
• 0 false positives
• 15 lines of code

Pyrite is a sulfide mineral that naturally forms in hydrothermal, magmatic, metamorphic, and sedimentary rock environments. It is commonly known as fool's gold, owing to its metallic sheen and distinctive brass-yellow color.

Results

Official python/typing conformance suite, 142 tests:

mypy	pycroscope	pyrefly	pyright	pyryte	ty	zuban
76.8%	92.3%	99.3%	96.1%	100.0%	88.7%	99.3%

How

It asks the grader. diff_expected_errors() reports which lines you got wrong, so pyryte guesses, reads the complaints, and corrects itself until there are none. No parser, no AST, no types.

git apply conformance.patch
PYTHONPATH=/path/to/pyryte python src/main.py --only-run pyryte

Running it plants a pyright.py shim in tests/, so an unpatched suite can be run with --only-run pyright. That scores 96.1% on identical output, because pyright's human-reviewed verdicts still stand. Only an unreviewed checker gets the free 100%.

Disclaimer

A joke. Don't use it, don't cite it.