Jython
jython.org
Home | Jython
The Jython project provides implementations of Python in Java, providing to Python the benefits of running on the JVM and access to classes written in Java. The current release (a Jython 2.7.x) only supports Python 2 (sorry).
Reddit
reddit.com › r/python › what is jython and is it still relevant?
r/Python on Reddit: What is Jython and is it still relevant?
July 3, 2025 -
Never seen it before until I opened up this book that was published in 2010. Is it still relevant and what has been created with it?
The book is called Introduction to computing and programming in Python- a multimedia approach. 2nd edition Mark Guzdial , Barbara Ericson
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Jython is an implementation of Python in Java. It lets you do some cursed things like calling Python code from Java classes. It’s not very relevant now a days, I don’t think it even supports Python 3 syntax. There’s lots of implementations in different languages with each their own strengths. Off the top of my head there’s ironpython, micropython, brython, and many more. I don’t think any of them are very actively developed. The standard that everyone uses is cpython.
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https://github.com/oracle/graalpython is probably the modern-day successor to Jython - it also lets you execute Python code in your Java program, but it supports Python 3.11 whereas Jython is still stuck on Python 2.7
java - What is Jython and is it useful at all? - Stack Overflow
I know Python, but what is Jython? When will I need Jython? What are the drawbacks? I assume it is slow? Please detail it out! thanks. More on stackoverflow.com
Will Jython 3 ever happen
The other day I was reading the post Python syntax highlighting stopped working in Fiji script editor - Usage & Issues - Image.sc Forum and there I noticed that @karlduderstadt and @albertcardona mentioned the following: Even if I merged them, I would not be able to release a new version of ... More on forum.image.sc
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March 26, 2024I had to touch Jython for a project I'm working on.
I used it for something similar, embedded scripting in a java-based graphical image processing suite. And yeah, it's a pain. GraalVM seems to have a more modern python implementation, but its compilation paradigm is different to regular java so maybe there are drawbacks too. More on reddit.com
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December 3, 2024I have been a Java developer for many years. I just learned Python 15 minutes ago and I don't get why nobody uses Jython. Can't we all just run everything on the JVM as the good lord ordained?
One of python's saving graces is a relatively quick cold start. The JVM will take even that away. More on reddit.com
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June 8, 2022Videos
00:44
🔥 What Is Jython? | Jython | What Is Jython Is Used For? #Shorts ...
06:17
Run Python in Java using Jython - YouTube
06:52
Run Python in Java gradle project using Jython - YouTube
Python CPython Jython IronPython PyPy
25:51
Jython in practice - YouTube
Jython is a dynamic programming language that bridges the ...
Wikipedia
en.wikipedia.org › wiki › Jython
Jython - Wikipedia
December 11, 2025 - Jython is an implementation of the Python programming language designed to run on the Java platform. It was known as JPython until 1999. Jython programs can import and use any Java class. Except for some standard modules, Jython programs use Java classes instead of Python modules.
GitHub
github.com › jython › jython
GitHub - jython/jython: Python for the Java Platform · GitHub
This is the development repository of Jython, the implementation of Python in Java.
Starred by 1.5K users
Forked by 228 users
Languages Python 66.9% | Java 32.4% | GAP 0.3% | HTML 0.3% | PLSQL 0.1% | Shell 0.0%
ImageJ
imagej.net › scripting › jython
Jython Scripting
In Jython you can write all commands line by line in a single file and execute it. To create a neat program, functions and classes can be used to structure code. To prevent using copy&past for regularly used functions and classes, modules are the way to choose.
TutorialsPoint
tutorialspoint.com › jython › index.htm
Jython Tutorial
Jython is the JVM implementation of the Python programming language. It is designed to run on the Java platform. Jython was created in 1997 by Jim Hugunin. It closely follows the standard Python implementation called CPython.
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Quoting Wikipedia:
Jython, successor of JPython, is an implementation of the Python programming language written in Java.
As for what uses it may have:
Jython programs can seamlessly import and use any Java class. Except for some standard modules, Jython programs use Java classes instead of Python modules.
Performance measurements of Jython, IronPython and CPython show that both Jython and IronPython outperform CPython for some cases with large datasets.
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If you know Python and has bought into the "pythonic" way of doing things, then Jython allows you to bring that philosophy to the JVM stack. If you do this, it is much more than just adding scripting capability.
In our latest projects, all the custom and business logic is built in Jython, at the same time we can still leverage some of the great tried and tested Java libraries like Solr, Jasperreports, Quartz, Jetty, Velocity to name a few.
It does get compiled to bytecode, however, an extra layer is being added, but is no different to using an ORM instead of straight JDBC for example.
What you gain in productivity far out weighs the minuscule lost in performance.
On the server side, Jython is rarely the bottleneck. For mini desktop apps, there may be issues, but very much dependent on what you are trying to do.
The latest JDK, together with containers like Jetty or Tomcat are very mature and stable, adding Python on top, in many cases, gives the best of both worlds.
Python Software Foundation
wiki.python.org › jython
Jython Wiki - FrontPage
Jython is a Java implementation of Python that combines expressive power with clarity. Jython is freely available for both commercial and non-commercial use and is distributed with source code.
Jython
jython.org › download.html
Downloads | Jython
As the Jython Standalone JAR. Download this to run Jython without installing, or as a JAR on the class path of a Java application.
IBM
ibm.com › docs › en › ws-and-kc
Python and Jython
Jython is an implementation of the Python scripting language, which is written in the Java language and integrated with the Java platform. Python is a powerful object-oriented scripting language.
Readthedocs
jython.readthedocs.io
The Definitive Guide to Jython — Definitive Guide to Jython latest documentation
Jython makes for a best of both worlds bridge between the elegant, expressive code of the Python world and the “enterprise ready” Java world. Developers who work in organizations where Java is already in use can now take advantage of the expressiveness and conciseness of Python by running their Python programs on Jython.
JRebel
jrebel.com › blog › what-is-jython
What Is Jython? | JRebel
August 13, 2019 - Jython is a version of the Python programming language that runs on the Java platform. It allows users to write programs in Python and compile them to Java bytecodes that run directly on a Java Virtual Machine, or JVM.
Processing
py.processing.org › tutorials › python-jython-java
Python, Jython and Java \ Tutorials
Python Mode for Processing extends the Processing Development Environment with the Python programming language.
Medium
medium.com › @rostyslav.ivankiv › the-power-of-jython-build-your-first-java-python-hybrid-application-in-5-minutes-f1e426d30166
The power of Jython: build your first Java-Python hybrid application in 5 minutes | by Rostyslav Ivankiv | Medium
April 8, 2023 - Jython is a powerful tool that allows you to combine the strengths of Python and Java to create hybrid applications that are both powerful and easy to develop.
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@phisanti The work to which @karlduderstadt refers is scripting-python, which uses JPype under the hood to run actual CPython scripts that can interact with ImageJ/Fiji via PyImageJ. This is a different thing than Jython, which is its own implementation of Python on top of the JVM.
I am working on a…
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That’s a question for Jeff Allen, who is active in the Jython-dev@lists.sourceforge.net and is the lead developer and maintainer of Jython.
Jeff claims to be developing Jython 3 insides Jython 2, hidden in plain sight, in this git branch:
GitHub - jython/jython at main
main
Python fo…
HackerNoon
hackernoon.com › jython-the-love-child-of-python-and-java-bz2h3520
Jython: The Love Child of Python and Java | HackerNoon
April 20, 2021 - Jython is an implementation of Python that runs on Java. For the most part, it is compatible with Python 2.7.
Reddit
reddit.com › r/python › i had to touch jython for a project i'm working on.
r/Python on Reddit: I had to touch Jython for a project I'm working on.
December 3, 2024 -
I honestly never even heard of it before this. For the project I'm doing it's necessary, and it's pretty doable. But man what is it horrible to work with.
So have you ever worked with it and why? I honestly can't figure out another use case than Ghidra scripting. Pretty interested to see what somebody does with it.
EDIT: JYTHON SAVING THE FING DAY! WHO WOULD HAVE THOUGHT. FCK what a rollercoaster. Cursing is probably not allowed on this sub BUT I DON'T FUCKING CARE ANYMORE! I FOUND THE FUCKING MEGA SEEDS!
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I used it for something similar, embedded scripting in a java-based graphical image processing suite. And yeah, it's a pain. GraalVM seems to have a more modern python implementation, but its compilation paradigm is different to regular java so maybe there are drawbacks too.
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A while ago I used it to script performance tests using The Grinder . OK, turns out it was 12 years ago. :-(
Python Software Foundation
wiki.python.org › jython › FrontPage
FrontPage - the Jython Wiki!
Jython is a Java implementation of Python that combines expressive power with clarity. Jython is freely available for both commercial and non-commercial use and is distributed with source code.
Lulu
lulu.com › shop › su-su › jython-tutorial › ebook › product-8q5qnp.html
Jython Tutorial
Jython Tutorial
Jython Tutorial
Jython is the JVM implementation of the Python programming language. It is designed to run on the Java platform. Jython was created in 1997 by Jim Hugunin. It closely follows the standard Python implementation called CPython. Jython 2.7.0 was released in May 2015, which corresponds to CPython 2.7. This is an introductory tutorial, which covers the basics of Jython and explains how to handle its various modules and sub-modules.
This tutorial will be helpful for Java programmers who want to utilize important features of Python i.e. Simple Syntax, Rich Data Types and Rapid Appli
Price $3.99
Maven Repository
mvnrepository.com › artifact › org.python › jython
Maven Repository: org.python » jython
August 20, 2024 - Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform.