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Short description: Java implementation of Python
Jython Logo
Initial releaseJanuary 17, 2001; 22 years ago (2001-01-17)[1]
Stable release
2.7.3 / 2022-09-10
Written inPython and Java
Operating systemCross-platform
PlatformJava virtual machine
TypePython Programming Language Interpreter
LicensePython Software Foundation License (for older releases see License terms)

Jython is an implementation of the Python programming language designed to run on the Java platform. The implementation was formerly known as JPython until 1999.[2]


Jython programs can import and use any Java class. Except for some standard modules, Jython programs use Java classes instead of Python modules. Jython includes almost all of the modules in the standard Python programming language distribution, lacking only some of the modules implemented originally in C. For example, a user interface in Jython could be written with Swing, AWT or SWT. Jython compiles Python source code to Java bytecode (an intermediate language) either on demand or statically.


Jython was initially created in late 1997 to replace C with Java for performance-intensive code accessed by Python programs, moving to SourceForge in October 2000. The Python Software Foundation awarded a grant in January 2005. Jython 2.5 was released in June 2009.[3]

Status and roadmap

The most recent release is Jython 2.7.3. It was released on 10 September 2022 and is compatible with Python 2.7.[4]

Python 3 compatible changes are planned in Jython 3 Roadmap.[5]

Although Jython implements the Python language specification, it has some differences and incompatibilities with CPython, which is the reference implementation of Python.[6][7]

License terms

From version 2.2 on, Jython (including the standard library) is released under the Python Software Foundation License (v2). Older versions are covered by the Jython 2.0, 2.1 license and the JPython 1.1.x Software License.[8]

The command line interpreter is available under the Apache Software License.


  • JBoss Application Server's command line interface scripting using Jython
  • Oracle Weblogic Server Scripting Tool uses Jython
  • IBM Rational development tools allow Jython scripting
  • IBM WebSphere Application Server tool scripting with wsadmin allows using Jython and Jacl
  • ZK – a Java Ajax framework that allows glue logic written in Jython
  • Ignition - A software development platform focused on HMI and SCADA[9]
  • Ghidra - a reverse engineering tool developed by the NSA allows plugins to be written in Java or Jython
  • openHAB - home automation software

See also

  • List of JVM languages
  • IronPython – an implementation of Python for .NET and Mono
  • PyPy – a self-hosting interpreter for the Python programming language.
  • JRuby – similar project for the Ruby programming language.
  • GraalVM - a polyglot runtime written in Java, has a Python 3 implementation


External links