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A Python 3 implementation built on GraalVM
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Latest commit b2b8ca7 Jun 21, 2019

GraalVM Implementation of Python

This is an early-stage experimental implementation of Python. A primary goal is to support SciPy and its constituent libraries. This Python implementation currently aims to be compatible with Python 3.7, but it is a long way from there, and it is very likely that any Python program that requires any packages at all will hit something unsupported. At this point, the Python implementation is made available for experimentation and curious end-users.

Trying it

To try it, you can use the bundled releases from For more information and some examples of what you can do with it, check out the reference.

Installing packages

At the moment not enough of the standard library is implemented to run the standard package installers for many packages. As a convenience, we provide a simple module to install packages that we know to be working (including potential patches required for those packages). Try the following to find out more:

graalpython -m ginstall --help

As a slightly more exciting example, try:

graalpython -m ginstall install numpy

If all goes well (you'll need to have clang, llvm-link, llvm-extract, llvm-nm, and opt in your PATH in addition to the normal NumPy build dependencies), you should be able to import numpy afterwards.

Support for more extension modules is high priority for us. We are actively building out our support for the Python C API to make extensions such as NumPy, SciPy, Scikit-learn, Pandas, Tensorflow and the like work. This work means that some other extensions might also already work, but we're not actively testing other extensions right now and cannot promise anything. Note that to try extensions on this implementation, you have to download, build, and install them manually for now. To do so, we recommend LLVM 6. Other versions might also work, but this version is what we're testing with in our CI.

Polyglot Usage

We have a document describing how we implement the cross-language interop. This will hopefully give you an idea how to use it.


I you're thinking about contributing something to this repository, you will need to sign the Oracle Contributor Agreement for us to able to merge your work. Please also take note of our code of conduct for contributors.

To get you started, we have written a bit about the structure of this interpreter that should show how to fix things or add features.


This GraalVM implementation of Python is copyright (c) 2017, 2019 Oracle and/or its affiliates and is made available to you under the terms the Universal Permissive License v 1.0 as shown at This implementation is in part derived from and contains additional code from 3rd parties, the copyrights and licensing of which is detailed in the LICENSE and 3rd_party_licenses.txt files.

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