Dhall is a programmable configuration language optimized for maintainability.

You can think of Dhall as: JSON + functions + types + imports

Note that while Dhall is programmable, Dhall is not Turing-complete. Many of Dhall's features take advantage of this restriction to provide stronger safety guarantees and more powerful tooling.

You can try the language live in your browser by visiting the official website:

• https://dhall-lang.org

dhall-python

dhall-python contains Dhall bindings for Python using the rust implementation. It is meant to be used to integrate Dhall into your python applications.

If you only want to convert Dhall to/from JSON or YAML, you should use the official tooling instead; instructions can be found here.

Usage

Install using pip:

pip install dhall

Supports the following:

• Operating Systems
  • Windows
  • Mac OS
  • Linux (manylinux_2_24_x86_64)
• Python versions
  • 3.7
  • 3.8
  • 3.9
  • 3.10
  • 3.11

Python 3.5 and 3.6 support is available in older versions of dhall-python.

dhall-python implements a similar API to Python's json module:

>>> import dhall
>>> dhall.dumps({"keyA": 81, "keyB": True, "keyC": "value"})
'{ keyA = 81, keyB = True, keyC = "value" }'
>>> dhall.loads("""{ keyA = 81, keyB = True, keyC = "value" }""")
{'keyA': 81, 'keyB': True, 'keyC': 'value'}

License

dhall-python is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in python-dhall by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

All contributions are welcome! If you spot any bugs, or have any requests, issues and PRs are always welcome.

Developer guide

This project uses poetry for managing the development environment. If you don't have it installed, run

curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python
export PATH="$HOME/.poetry/bin:$PATH"

The project requires the latest stable version of Rust.

Install it via rustup:

rustup install stable

If you have already installed the stable version, make sure it is up-to-date:

rustup update stable

After that, you can compile the current version of dhall-python and execute all tests and benchmarks with the following commands:

make install
make test

🤫 Pssst!... run make help to learn more.