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Python wrapper for the Zenroom virtual machine

Project description

Zenroom 🐍
A Python3 wrapper of Zenroom, a secure and small virtual machine for crypto language processing

Build status Code coverage PyPI

Zenroom and are part of the DECODE project about data-ownership and technological sovereignty. Our effort is that of improving people's awareness of how their data is processed by algorithms, as well facilitate the work of developers to create along privacy by design principles using algorithms that can be deployed in any situation without any change.

This library attempts to provide a very simple wrapper around the Zenroom ( crypto virtual machine developed as part of the DECODE project (, that aims to make the Zenroom virtual machine easier to call from normal Python code.

Zenroom itself does have good cross platform functionality, so if you are interested in finding out more about the functionalities offered by Zenroom, then please visit the website linked to above to find out more.

💾 Installation

pip install zenroom

NOTE - the above command attempts to install the zenroom package, pulling in the Zenroom VM as a precompiled binary, so will only work on Linux (amd64) and macOS machines.

🎮 Usage

Two main calls are exposed, one to run zencode and one for zenroom scripts.

If you don't know what zencode is, you can start with this blogpost The official documentation is available on

A good set of examples of zencode contracts could be found on

🐍 Python wrapper

the wrapper exposes two simple calls:

  • zenroom_exec
  • zencode_exec

as the names suggest are the two methods to execute zenroom (lua scripts) and zencode.


Both functions accept the same arguments:

  • script string the lua script or the zencode script to be executed
  • keys string the optional keys string to pass in execution as documented in zenroom docs here
  • data string the optional data string to pass in execution as documented in zenroom docs here
  • conf string the optional conf string to pass according to zen_config here


Both functions return the same object result ZenResult that have two attributes:

  • stdout string holds the stdout of the script execution
  • stderr string holds the stderr of the script execution

Example usage of zencode_exec(script, keys=None, data=None, conf=None)

from zenroom import zenroom

contract = """Scenario 'simple': Create a keypair"
Given that I am known as 'identifier'
When I create the keypair
Then print my data

result = zenroom.zencode_exec(contract)

Example usage of zenroom_exec(script, keys=None, data=None, conf=None)

from zenroom import zenroom

script = "print('Hello world')"
result = zenroom.zenroom_exec(script)


The same arguments and the same result are applied as the zencode_exec call.

📋 Testing

Tests are made with pytests, just run

python test

in ([] file you'll find more usage examples of the wrapper

🌐 Links

😍 Acknowledgements

Copyright (C) 2018 by foundation, Amsterdam

Originally designed and written by Sam Mulube.

Designed, written and maintained by Puria Nafisi Azizi.

Software contained include sources taken from pytest.

Project funded by the European Commission

This project is receiving funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement nr. 732546 (DECODE).

👥 Contributing

  1. FORK IT
  2. Create your feature branch git checkout -b feature/branch
  3. Commit your changes git commit -am 'Add some fooBar'
  4. Push to the branch git push origin feature/branch
  5. Create a new Pull Request
  6. Thank you

💼 License - a python wrapper of zenroom
  Copyright (c) 2018 foundation, Amsterdam

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  GNU Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <>.

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