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A client to the EBI Ontology Lookup Service

Project description

OLS Client

Tests PyPI PyPI - Python Version PyPI - License Documentation Status Codecov status Cookiecutter template from @cthoyt Code style: black Contributor Covenant DOI

A client to the EBI Ontology Lookup Service (OLS) and other instances.

💪 Getting Started

One of several OLS clients can be instantiated and accessed with the same API:

from ols_client import EBIClient

ebi_client = EBIClient()
ontologies = ebi_client.get_ontologies()

Further documentation can be found at

🚀 Installation

The most recent release can be installed from PyPI with:

$ pip install ols_client

The most recent code and data can be installed directly from GitHub with:

$ pip install git+

👐 Contributing

Contributions, whether filing an issue, making a pull request, or forking, are appreciated. See for more information on getting involved.

👋 Attribution

⚖️ License

The code in this package is licensed under the MIT License.


Since the creation of this repository, the EBI has also generated their own client that can be found at and on PyPI as ebi-ols-client.

🍪 Cookiecutter

This package was created with @audreyfeldroy's cookiecutter package using @cthoyt's cookiecutter-snekpack template.

🛠️ For Developers

See developer instructions

The final section of the README is for if you want to get involved by making a code contribution.

Development Installation

To install in development mode, use the following:

$ git clone git+
$ cd ols-client
$ pip install -e .

🥼 Testing

After cloning the repository and installing tox with pip install tox, the unit tests in the tests/ folder can be run reproducibly with:

$ tox

Additionally, these tests are automatically re-run with each commit in a GitHub Action.

📖 Building the Documentation

The documentation can be built locally using the following:

$ git clone git+
$ cd ols-client
$ tox -e docs
$ open docs/build/html/index.html

The documentation automatically installs the package as well as the docs extra specified in the setup.cfg. sphinx plugins like texext can be added there. Additionally, they need to be added to the extensions list in docs/source/

📦 Making a Release

After installing the package in development mode and installing tox with pip install tox, the commands for making a new release are contained within the finish environment in tox.ini. Run the following from the shell:

$ tox -e finish

This script does the following:

  1. Uses Bump2Version to switch the version number in the setup.cfg, src/ols_client/, and docs/source/ to not have the -dev suffix
  2. Packages the code in both a tar archive and a wheel using build
  3. Uploads to PyPI using twine. Be sure to have a .pypirc file configured to avoid the need for manual input at this step
  4. Push to GitHub. You'll need to make a release going with the commit where the version was bumped.
  5. Bump the version to the next patch. If you made big changes and want to bump the version by minor, you can use tox -e bumpversion minor after.

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