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.
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.
The most recent release is Jython 2.7.3. It was released on September 10, 2022 and is compatible with Python 2.7.
Python 3 compatible changes are planned in Jython 3 Roadmap.
Although Jython implements the Python language specification, it has some differences and incompatibilities with CPython, which is the reference implementation of Python.
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.
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
Ghidra - a reverse engineering tool developed by the NSA allows plugins t
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Java is a set of computer software and specifications developed by James Gosling at Sun Microsystems that provides a system for developing application software and deploying it in a cross-platform computing environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to enterprise servers and supercomputers. Java applets, which are less common than standalone Java applications, were commonly run in secure, sandboxed environments to provide many features of native applications through being embedded in HTML pages.
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