# cosmicpython/book

A Book about Pythonic Application Architecture Patterns for Managing Complexity.  Cosmos is the Opposite of Chaos you see. O'R. wouldn't actually let us call it "Cosmic Python" tho.

Repository: https://github.com/cosmicpython/book
Canonical: https://ross.abutalabs.com/products/cosmicpython-book
Homepage: https://www.cosmicpython.com
Language: Python
License: NOASSERTION
License Family: other
Last push: 2025-09-08T15:57:13+00:00

## Health v2 (maintenance only)
Score: 41/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 41, release rhythm 8, longevity 100
- inputs: {"age_days": 2766, "days_push": 359, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3847, forks 570 (observed 2026-08-28T04:08:24.160261+00:00)

## What it is
An open-source book ('Architecture Patterns with Python') covering Pythonic application architecture patterns for managing complexity, including domain modeling, repository, service layer, unit of work, message bus, and CQRS. The repository hosts the book source (AsciiDoc) published under a Creative Commons license and readable free online.

## Use cases
- learn domain-driven design in Python
- understand repository and unit of work patterns
- study event-driven architecture and message bus design
- learn how to structure a Flask application with a service layer
- read a free book on Python software architecture
- learn CQRS and command handling patterns
- improve test-driven development practices for Python apps

## When to choose
- you are a Python developer designing medium-to-large applications
- you want practical, code-backed explanations of DDD and architectural patterns
- you prefer learning from a free, openly licensed book

## When to avoid
- you need a runnable library or framework rather than educational material
- you want patterns for languages other than Python
- you need an exhaustive reference on distributed systems theory

## Facets
- artifact type: learning-resource
- maturity: stable
- function: documentation, developer-tools
- domain: developer-tools, tutorials, web-development
- platform: python, cross-platform
- tags: book, architecture-patterns, ddd, domain-driven-design, microservices, cqrs, event-driven-architecture, tdd, free-book, algorithms

## Member repositories
- cosmicpython/book (main) score 41

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:24.160261+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:26:00.151750+00:00, confidence not recorded.
  - readme: https://github.com/cosmicpython/book (fetched 2026-08-28T04:08:24.160261+00:00, sha b8829cc4c4e1)
  - homepage: https://www.cosmicpython.com (fetched 2026-08-29T09:20:41.498245+00:00, sha 21d4304da050)
- Data as of 2026-08-30T08:39:29.467469+00:00.