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Description:

phxclassregistry 5.0.0

ClassRegistry
At the intersection of the Registry and Factory patterns lies the ClassRegistry:

Define global factories that generate new class instances based on configurable keys.
Seamlessly create powerful service registries.
Integrate with setuptools’s entry_points system to make your registries infinitely
extensible by 3rd-party libraries!
And more!

Upgrading from ClassRegistry v4

Important
ClassRegistry v5 introduces some changes that can break code that was previously
using ClassRegistry v4. If you are upgrading from ClassRegistry v4 to ClassRegistry
v5, please read Upgrading to ClassRegistry v5.

Getting Started
Create a registry using the class_registry.ClassRegistry class, then
decorate any classes that you wish to register with its register method:
from class_registry import ClassRegistry

pokedex = ClassRegistry()

@pokedex.register('fire')
class Charizard(Pokemon):
...

@pokedex.register('grass')
class Bulbasaur(Pokemon):
...

@pokedex.register('water')
class Squirtle(Pokemon):
...
To create a class instance from a registry, use the subscript operator:
# Charizard, I choose you!
fighter1 = pokedex['fire']

# CHARIZARD fainted!
# How come my rival always picks the type that my pokémon is weak against??
fighter2 = pokedex['grass']

Tip
If a ClassRegistry always returns objects derived from a particular base class,
you can provide a
type parameter
to help with type checking, autocomplete, etc.:
# Add type parameter ``[Pokemon]``:
pokedex = ClassRegistry[Pokemon]()

# Your IDE will automatically infer that ``fighter1`` is a ``Pokemon``.
fighter1 = pokedex['fire']

Advanced Usage
There’s a whole lot more you can do with ClassRegistry, including:

Provide args and kwargs to new class instances.
Automatically register non-abstract classes.
Integrate with setuptools’s entry_points system so that 3rd-party libraries can
add their own classes to your registries.
Wrap your registry in an instance cache to create a service registry.
And more!

For more advanced usage, check out the documentation on
ReadTheDocs!

Requirements
ClassRegistry is known to be compatible with the following Python versions:

3.12
3.11
3.10

Note
I’m only one person, so to keep from getting overwhelmed, I’m only committing to
supporting the 3 most recent versions of Python. ClassRegistry’s code is pretty
simple, so it’s likely to be compatible with versions not listed here; there just
won’t be any test coverage to prove it 😇

Installation
Install the latest stable version via pip:
pip install phx-class-registry

Important
Make sure to install phx-class-registry, not class-registry. I created the
latter at a previous job years ago, and after I left they never touched that project
again and stopped responding to my emails — so in the end I had to fork it 🤷

Maintainers
To install the distribution for local development, some additional setup is required:

Install poetry (only needs to be
done once).
Run the following command to install additional dependencies:
poetry install --with=dev

Activate pre-commit hook:
poetry run autohooks activate --mode=poetry

Running Unit Tests and Type Checker
Run the tests for all supported versions of Python using
tox:
poetry run tox -p

Note
The first time this runs, it will take awhile, as mypy needs to build up its cache.
Subsequent runs should be much faster.

If you just want to run unit tests in the current virtualenv (using
pytest):
poetry run pytest
If you just want to run type checking in the current virtualenv (using
mypy):
poetry run mypy class_registry test

Documentation
To build the documentation locally:

Switch to the docs directory:
cd docs

Build the documentation:
make html

Releases
Steps to build releases are based on
Packaging Python Projects Tutorial.

Important
Make sure to build releases off of the main branch, and check that all changes
from develop have been merged before creating the release!

1. Build the Project

Delete artefacts from previous builds, if applicable:
rm dist/*

Run the build:
poetry build

The build artefacts will be located in the dist directory at the top
level of the project.

2. Upload to PyPI

Create a PyPI API token (you only have to
do this once).
Increment the version number in pyproject.toml.
Upload build artefacts to PyPI:
poetry publish

3. Create GitHub Release

Create a tag and push to GitHub:
git tag <version>
git push <version>
<version> must match the updated version number in pyproject.toml.

Go to the Releases page for the repo.
Click Draft a new release.
Select the tag that you created in step 1.
Specify the title of the release (e.g., ClassRegistry v1.2.3).
Write a description for the release. Make sure to include:
- Credit for code contributed by community members.
- Significant functionality that was added/changed/removed.
- Any backwards-incompatible changes and/or migration instructions.
- SHA256 hashes of the build artefacts.
GPG-sign the description for the release (ASCII-armoured).
Attach the build artefacts to the release.
Click Publish release.