sygaldry 0.3.0

Build arbitrary Python objects from YAML or TOML configuration files.

whereby an artificer uses runes and delicate metalwork to create items capable of amazing feats.

Sygaldry is a Python library for building arbitrary object graphs from YAML or TOML configuration files. It is designed for teams that run many similar scheduled jobs and want to write reusable components, then compose them through configuration rather than code.

Features

• YAML and TOML configuration with deep-merge includes.

• Interpolation – ${VAR} placeholders resolved from config paths, environment variables, or defaults.

• Component instantiation – _type mappings construct classes, _func mappings import callables.

• References – _ref wires components together by name or dotted attribute path.

• Instance caching – identical specs share instances; named _instance tags give explicit control.

• Safety – no eval, no arbitrary code; imports are by dotted path only.

Installation

pip install sygaldry

Quick start

Define your components in a YAML file:

# config.yaml
db:
  _type: "myapp.db.Database"
  host: "${DB_HOST:-localhost}"
  port: 5432

service:
  _type: "myapp.services.UserService"
  db: { _ref: "db" }

Then load and resolve:

from sygaldry import load

graph = load("config.yaml")
service = graph["service"]   # a fully wired UserService instance

Or use the Artificery class for more control:

from sygaldry import Artificery

factory = Artificery("config.yaml", transient=True)
graph = factory.resolve()

License

MIT