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Java Embedded Python (ctypes/cffi-based Jep)

Project description

Currently only as placeholder (because a base package jtypes.jvm is still in development)


Java Embedded Python.


jtypes.jep embeds CPython in Java.

PyPI record.

jtypes.jep is a lightweight Python package, based on the ctypes or cffi library.
It is an almost fully compliant implementation of Mike Johnson’s Jep package by reimplementing its functionality in a clean Python instead of C.

About Jep:

Borrowed from the original website:

Jep embeds CPython in Java through JNI and is safe to use in a heavily threaded environment.

Some benefits of embedding CPython in a JVM:

  • Using the native Python interpreter may be much faster than alternatives.

  • Python is mature, well supported, and well documented.

  • Access to high quality Python modules, both native CPython extensions and Python-based.

  • Compilers and assorted Python tools are as mature as the language.

  • Python is an interpreted language, enabling scripting of established Java code without requiring recompilation.

  • Both Java and Python are cross platform, enabling deployment to different operating systems.

Notable features

  • Interactive Jep console much like Python’s interactive console

  • Supports multiple, simultaneous, mostly sandboxed sub-interpreters

  • Numpy support for Java primitive arrays


  • Java >= 1.7 - either the Sun/Oracle JRE/JDK or OpenJDK.

  • NumPy >= 1.7 (optional)



To install run:

python -m pip install --upgrade jtypes.jep

To ensure everything is running correctly you can run the tests using:

python -m jt.jep.tests


Visit development page

Installation from sources:

Clone the sources and run:

python -m pip install ./jtypes.jep

or on development mode:

python -m pip install --editable ./jtypes.jep


  • Development is strictly based on tox. To install it run:

    python -m pip install tox


Copyright (c) 2014-2018 Adam Karpierz

Licensed under the zlib/libpng License
Please refer to the accompanying LICENSE file.



3.8.2a2 (2018-11-08)

  • Synchro with pyjnius master branch.

  • Update of the required setuptools version.

  • Minor setup and tests improvements.

3.7.1b4 (2018-05-23)

  • Update of the required setuptools version.

  • Documentation update.

3.7.1b3 (2018-02-26)

  • Improvement and simplification of setup and packaging.

3.7.1b2 (2018-01-29)

  • Development moved to github.

  • General improvements and update.

3.7.1b1 (2017-01-01)

  • First beta release.

1.1.0b1 (2017-01-01)

  • First beta release.

1.1.0b1 (2017-01-01)

  • First beta release.

0.1.1 (2005-10-05)

  • Initial version.

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