FizzBee
Formal methods in Python. The easiest formal specification language and model checker for the full development cycle: requirements analysis, design verification, and model-based testing. GitHub: https://www.github.com/fizzbee-io/FizzBee Traditionally, formal methods are used only for highly mission critical systems to validate the software will work as expected before it's built.

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Every prompt leaves decisions unmade — and your agent will make them silently. FizzBee asks the questions your prompt didn't, then generates a precise, verified specification your coding agent can build from.
PEP 827
peps.python.orgTS-like type manipulation in Python
A functional programming and concurrency library for Python: algebraic abstractions (Semigroups, Monoids, Functors, Applicatives, Monads), immutable data types, and message-passing concurrency, all designed as composable, type-safe values.
let types trickle from runtime to compile time
Rewriting Principia Mathematica in Lean