OpenFisca Rules as Code model for Country-Template.
Project description
OpenFisca Country-Template
This repository helps you quickly bootstrap and use your own OpenFisca country package.
You should NOT fork it but download a copy of it and follow the bootstrapping instructions below.
Otherwise, you will have to clean up all tags when you deploy your own country package.
Bootstrapping your Country Package
This set of instructions only needs to be followed once and will create your own copy of this boilerplate directory, customising it to the country you want to work on. You will need to have Git installed.
-
Download a copy of this repository, unzip it and
cdinto it in a Terminal window. -
Create a new repository on your favourite git host (Github, Bitbucket, GitLab, etc) with the name openfisca-your_country_name. For example,
openfisca-new_zealandoropenfisca-france. -
Execute the
bootstrap.shscript to initialise the git repository. This performs numerous tasks including replacing all references toopenfisca-country_templatewith references to the new country package.- To execute the script run
bash bootstrap.shfrom the command line. Note: this script can only run on Unix systems, but OpenFisca and the resulting package will work on Windows too. - After the
bootstrap.shhas run both it and these instructions are removed.
- To execute the script run
-
Follow the instructions in the new repository's README.md.
Writing the Legislation
The country whose law is modelled here has a very simple tax and benefit system.
- It has a flat rate tax whose rates increase every year.
- On the first of December, 2015, it introduced a basic income for all its citizens of age who have no income.
- On the first of December, 2016, it removed the income condition, providing all its adult citizens with a basic income.
These elements are described in different folders. All the modelling happens within the openfisca_country_template folder.
- The rates are in the
parametersfolder. - The formulas are in the
variablesfolder. - This country package comes also with reforms in the
reformsfolder. This is optional: your country may exist without defining any reform.- In this country, there is a reform project aiming to modify the social security taxation, deleting the first bracket, raising the intermediary ones and adding a new bracket with a higher tax rate of
40 %for people earning more than40000. This reform project would apply starting from2017-01-01.
- In this country, there is a reform project aiming to modify the social security taxation, deleting the first bracket, raising the intermediary ones and adding a new bracket with a higher tax rate of
The files that are outside from the openfisca_country_template folder are used to set up the development environment.
Packaging your Country Package for Distribution
Country packages are python distributions. To distribute your package via pip, follow the steps given by the Python Packaging Authority.
Install Instructions for Users and Contributors
This package requires Python 3.9. More recent versions should work, but are not tested.
All platforms that can execute Python are supported, which includes GNU/Linux, macOS and Microsoft Windows.
Setting-up a Virtual Environment with venv
In order to limit dependencies conflicts, we recommend using a virtual environment with venv.
- A venv is a project specific environment created to suit the needs of the project you are working on.
To create a virtual environment, launch a terminal on your computer, cd into your directory and follow these instructions:
python3 -m venv .venv # create a new virtual environment in the “.venv” folder, which will contain all dependencies
source .venv/bin/activate # activate the venv
You can now operate in the venv you just created.
You can deactivate that venv at any time with deactivate.
:tada: You are now ready to install this OpenFisca Country Package!
Two install procedures are available. Pick procedure A or B below depending on how you plan to use this Country Package.
A. Minimal Installation (Pip Install)
Follow this installation if you wish to:
- run calculations on a large population;
- create tax & benefits simulations;
- write an extension to this legislation (e.g. city specific tax & benefits);
- serve your Country Package with the OpenFisca Web API.
For more advanced uses, head to the Advanced Installation.
Install this Country Package with Pip Install
Inside your venv, check the prerequisites:
python --version # should print "Python 3.9.xx".
pip --version # should print at least 9.0.
# if not, run "pip install --upgrade pip"
Install the Country Package:
pip install openfisca-country_template
:warning: Please beware that installing the Country Package with pip is dependent on its maintainers publishing said package.
:tada: This OpenFisca Country Package is now installed and ready!
Next Steps
- To learn how to use OpenFisca, follow our tutorials.
- To serve this Country Package, serve the OpenFisca Web API.
Depending on what you want to do with OpenFisca, you may want to install yet other packages in your venv:
- To install extensions or write on top of this Country Package, head to the Extensions documentation.
- To plot simulation results, try matplotlib.
- To manage data, check out pandas.
B. Advanced Installation (Git Clone)
Follow this tutorial if you wish to:
- create or change this Country Package's legislation;
- contribute to the source code.
Clone this Country Package with Git
First, make sure Git is installed on your machine.
Set your working directory to the location where you want this OpenFisca Country Package cloned.
Inside your venv, check the prerequisites:
python --version # should print "Python 3.9.xx".
Clone this Country Package on your machine:
git clone https://example.com/repository.git
cd repository_folder
pip install --upgrade pip build twine
pip install --editable .[dev] --upgrade
You can make sure that everything is working by running the provided tests with make test.
:tada: This OpenFisca Country Package is now installed and ready!
Next Steps
- To write new legislation, read the Coding the legislation section to know how to write legislation.
- To contribute to the code, read our Contribution Guidebook.
Serve this Country Package with the OpenFisca Web API
If you are considering building a web application, you can use the packaged OpenFisca Web API with your Country Package.
To serve the Openfisca Web API locally, run:
openfisca serve --port 5000 --country-package openfisca_country_template
Or use the quick-start Make command:
make serve-local
To read more about the openfisca serve command, check out its documentation.
You can make sure that your instance of the API is working by requesting:
curl "http://localhost:5000/spec"
This endpoint returns the Open API specification of your API.
:tada: This OpenFisca Country Package is now served by the OpenFisca Web API! To learn more, go to the OpenFisca Web API documentation.
You can test your new Web API by sending it example JSON data located in the situation_examples folder.
curl -X POST -H "Content-Type: application/json" \
-d @./openfisca_country_template/situation_examples/couple.json \
http://localhost:5000/calculate
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