moai-lang-python

Create an async engine with create_async_engine, then build an async_sessionmaker with expire_on_commit set to False. Define a get_db dependency that yields sessions via async context manager, and inject it into endpoints using Depends.

Use pytest-asyncio with asyncio_mode set to auto in pyproject.toml. Create an AsyncClient fixture with ASGITransport pointing at your app, override the get_db dependency with a test session, and mark test functions with pytest.mark.asyncio.

The parse_obj method is now model_validate, parse_raw is now model_validate_json, and from_orm requires from_attributes set to True in ConfigDict. Validators use field_validator and model_validator decorators instead of the old validator API.

Python 3.13 offers an experimental free-threaded build via PEP 703, available as python3.13t in official installers. It enables true parallel thread execution but is not recommended for production use yet.

This happens when accessing attributes after commit expires the objects. Set expire_on_commit to False in the sessionmaker configuration, or call await session.refresh on the object after committing.

Both are supported with pyproject.toml configurations. Poetry provides mature dependency resolution and lock files, while uv offers significantly faster installation speeds and can manage virtual environments with uv venv.