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Zenroom for Python: Bindings of Zenroom library for Python.

Project description

Use Zenroom in Python3

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

Build status Code coverage PyPI

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 and macOS machines.

for the edge (syn to the latest commit on master) version please run:

pip install zenroom --pre

The zenroom package is just a wrapper around the zencode-exec utility. You also need to install zencode-exec, you can download if from the official releases on github

When after downloading you have to move it somewhere in your path:

sudo cp zencode-exec /usr/local/bin/

Warning: on Mac OS, the executable is zencode-exec.command and you have to symlink it to zencode-exec

sudo cp zencode-exec.command /usr/local/bin/
cd /usr/local/bin
sudo ln -s zencode-exec.command zencode-exec

🎮 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 ecdh: 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) 2018-2022 by foundation, Amsterdam

Originally designed and written by Sam Mulube.

Designed, written and maintained by Puria Nafisi Azizi

Rewritten by Danilo Spinella and David Dashyan

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

Please first take a look at the - Contributor License Agreement then

  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 gh pr create -f
  6. 🙏 Thank you

💼 License - a python wrapper of zenroom
  Copyright (c) 2018-2022 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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