For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /packs/languages/python/README.md.
Quick start

Functional Python

Use pure functions, immutable domain values, explicit capabilities, and typed Results. Never author raise or try/except application control flow. Apply this pack to Python source and examples.

Read bytefarm/engineering through the installation index first. Use returns for typed failure and composition; its documented decorator/composition typing requires the compatible mypy plugin. A recommendation is not dependency installation authorization.

TaskRead
Design behaviorParadigm
Name declarationsNaming
Organize modulesFile structure
Declare operationsFunctions
Model valid valuesTypes
Handle branchesConditionals
Return failuresErrors
Transform stateState
Compose and reuseUtilities
Document contractsComments
Verify behaviorTesting

Identity: bytefarm/python-functional. Content version: 0.1.0.