A Look At Jython
This article discusses Jython, a software project that aims to provide seamless integration between Java and Python. This article requires a basic understanding of both languages
This article discusses Jython, a software project that ai
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Using The Jython Interpreter
The jython interpreter is a Python interpreter implemented in 100% Java. It allows you to write Python code that accesses Java classes.
The latest stable version of jython, released in December of 2001, implements features of Python 2.1. Python, however, has already reached version 2.3. This means that Python features unique to versions 2.2 and 2.3 are unavailable in the current stable version of jython:
* New in Python 2.2
o deriving from built-in types
o attribute and method descriptors
o changes to the class lookup algorithm for complicated class hierarchies
o new built-in methods for attribute access
o iterators
o generators
* New in Python 2.3
o new boolean and set data types
o source code encodings
o importing from zip archives
o universal newline support
o an enumerate function for clearer iterative loops
o new import hooks
An alpha version of jython, available for download at the Jython site, implements a mixture of Python 2.1 and 2.2. The Jython group characterizes this alpha version as an unstable and experimental release that contains significant known issues. In other words, use the alpha version at your own risk.
Besides lacking recent Python language features, jython is missing some Python modules in its library implementation. On top of that, there is little documentation describing which modules are supported and which are not. If you want to know if a module is supported, the FAQ suggests attempting to import the module in question. If the import fails, you can try to copy over the corresponding *.py module from the CPython implementation. As a last effort you can request help on the public mailing lists.
While the Python support in jython is restricted to version 2.1, the Java support is completely up-to-date. You can use _any_ Java code from inside the jython interpreter. This includes the standard Java 1.4.2 libraries, libraries written by third parties, and your own custom libraries.
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