#476: Common themes

Topics covered in this episode:

• Migrating from mypy to ty: Lessons from FastAPI
• Oxyde ORM
• Typeshedded CPython docs
• Raw+DC Database Pattern: A Retrospective
• Extras
• Joke

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Brian #1: Migrating from mypy to ty: Lessons from FastAPI

• Tim Hopper
• I saw this post by Sebastián Ramírez about all of his projects switching to ty
  • FastAPI, Typer, SQLModel, Asyncer, FastAPI CLI
• SqlModel is already ty only - mypy removed
• This signals that ty is ready to use
• Tim lists some steps to apply ty to your own projects
  • Add ty alongside mypy
  • Set error-on-warning = true
  • Accept the double-ignore comments
  • Pick a smaller project to cut over first
  • Drop mypy when the noise exceeds the signalAdd ty alongside mypy
• Related anecdote:
  • I had tried out ty with pytest-check in the past with difficulty
  • Tried it again this morning, only a few areas where mypy was happy but ty reported issues
  • At least one ty warning was a potential problem for people running pre-releases of pytest,
  • Not really related: packaging.version.parse is awesome

Michael #2: Oxyde ORM

• Oxyde ORM is a type-safe, Pydantic-centric asynchronous ORM with a high-performance Rust core.
• Note: Oxyde is a young project under active development. The API may evolve between minor versions.
• No sync wrappers or thread pools. Oxyde is async from the ground up
• Includes oxyde-admin
• Features
  • Django-style API - Familiar Model.objects.filter() syntax
  • Pydantic v2 models - Full validation, type hints, serialization
  • Async-first - Built for modern async Python with asyncio
  • Rust performance - SQL generation and execution in native Rust
  • Multi-database - PostgreSQL, SQLite, MySQL support
  • Transactions - transaction.atomic() context manager with savepoints
  • Migrations - Django-style makemigrations and migrate CLI

Brian #3: Typeshedded CPython docs

• Thanks emmatyping for the suggestion
• Documentation for Python with typeshed types
• Source: typeshedding_cpython_docs

Michael #4: Raw+DC Database Pattern: A Retrospective

• A new design pattern I’m seeing gain traction in the software space: Raw+DC: The ORM pattern of 2026
• I’ve had a chance to migrate three of my most important web app.
• Thrilled to report that yes, the web app is much faster using Raw+DC
• Plus, this was part of the journey to move from 1.3 GB memory usage to 0.45 GB (more on this next week)

Extras

Brian:

• Lean TDD 0.5 update
  • Significant rewrite and focus

Michael:

• pytest-just (for just command file testing), by Michael Booth
• Something going on with Encode
  • httpx: Anyone know what's up with HTTPX? And forked
  • starlette and uvicorn: Transfer of Uvicorn & Starlette
  • mkdocs: The Slow Collapse of MkDocs
  • django-rest-framework: Move to django commons?
• Certificates at Talk Python Training

Joke:

• Neue Rich