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Python bindings for dhall, a functional configuration language

Project description

Dhall logo

Maintenance CI status PyPI version PyPI downloads

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:


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.


Install using pip:

pip install dhall

Supports Windows, Mac OS, and Linux (with and

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'}


dhall-python is licensed under either of

at your option.


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 | python
export PATH="$HOME/.poetry/bin:$PATH"

The project requires the nightly version of Rust.

Install it via rustup:

rustup install nightly

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

rustup update nightly

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.

Project details

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Files for dhall, version 0.1.0
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