odin

Odin

Odin provides a declarative framework for defining resources (classes) and their relationships, validation of the fields that make up the resources and mapping between objects (either a resource, or other python structures).

Odin also comes with built in serialisation tools for importing and exporting data from resources.

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Highlights

---

• Class based declarative style
• Class based annotations style! ✨ new in 2.0
• Fields for building composite resources
• Field and Resource level validation
• Easy extension to support custom fields
• Python 3.8+ and PyPy :sup:1 supported
• Support for documenting resources with Sphinx <http://sphinx-doc.org/>_
• Minimal dependencies

:sup:1 certain contrib items are not supported. Pint is not installable with PyPy.

Use cases

---

• Design, document and validate complex (and simple!) data structures
• Convert structures to and from different formats such as JSON, YAML, MsgPack, CSV, TOML
• Validate API inputs
• Define message formats for communications protocols, like an RPC
• Map API requests to ORM objects

Quick links

---

• Documentation <https://odin.readthedocs.org/>_
• Project home <https://github.com/python-odin/odin>_
• Issue tracker <https://github.com/python-odin/odin/issues>_

Upcoming features

---

In development

• XML Codec (export only)
• Complete documentation coverage
• Improvements for CSV Codec (writing, reading multi resource CSV's)

Requires

---

Optional

• simplejson - Odin will use simplejson if it is available or fallback to the builtin json library
• msgpack-python - To enable use of the msgpack codec
• pyyaml - To enable use of the YAML codec
• toml - To enable use of the TOML codec

Contrib

• arrow - Support for Arrow data types.
• pint - Support for physical quantities using the Pint <http://pint.readthedocs.org/>_ library.

Development

• pytest - Testing
• pytest-cov - Coverage reporting

Example

---

Definition

.. code-block:: python

import odin

class Author(odin.Resource):
    name = odin.StringField()

class Publisher(odin.Resource):
    name = odin.StringField()

class Book(odin.Resource):
    title = odin.StringField()
    authors = odin.ArrayOf(Author)
    publisher = odin.DictAs(Publisher)
    genre = odin.StringField()
    num_pages = odin.IntegerField()

Using Annotations

.. code-block:: python

import odin

class Author(odin.AnnotatedResource):
    name: str

class Publisher(odin.AnnotatedResource):
    name: str
    website: Optional[odin.Url]

class Book(odin.AnnotatedResource):
    title: str
    authors: List[Author]
    publisher: Publisher
    genre: str
    num_pages: int

Usage::

>>> b = Book(
        title="Consider Phlebas",
        genre="Space Opera",
        publisher=Publisher(name="Macmillan"),
        num_pages=471
    )
>>> b.authors.append(Author(name="Iain M. Banks"))
>>> from odin.codecs import json_codec
>>> json_codec.dumps(b, indent=4)
{
    "$": "Book",
    "authors": [
        {
            "$": "Author",
            "name": "Iain M. Banks"
        }
    ],
    "genre": "Space Opera",
    "num_pages": 471,
    "publisher": {
        "$": "Publisher",
        "name": "Macmillan"
    },
    "title": "Consider Phlebas"
}