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Comment: footnote to explain GIL
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'''Python''' '''Python 2.7'''
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  * GIL [[FootNote(Global Interpreter Lock, explained in [http://docs.python.org/api/threads.html Python documentation, chapter 8.1])]]
  * Python Garbage Collection		   * GIL <<FootNote(Global Interpreter Lock, explained in [http://docs.python.org/api/threads.html Python documentation, chapter 8.1])>>
  * Python garbage collection, which mixes ref counting and mark and sweep
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'''Jython'''
  * 100% Java
  * Any JVM (currently 1.1+)
  * Compiles to .class
  * Extend with Java		 '''Jython 2.7'''
  * Written mostly in Java, does use Java Native Runtime for C access, but works with security manager restrictions
  * Java 7 or Java 8
  * Compiles to $py.class files
  * Extend with Java or C using JFFI; full CFFI, ctypes, and C Extension API support planned for the future
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  * Java garbage collection   * Java garbage collection, including choice of standard Java GCs; but also provides same API as Python 2.7 to observe GC

Jython, lest you do not know of it, is the most compelling weapon the Java platform has for its survival into the 21st century - SeanMcGrath

Why Jython

There are numerous alternative languages implemented for the Java VM. The following features help to separate Jython from the rest:

  • Dynamic compilation to Java bytecodes - leads to highest possible performance without sacrificing interactivity.
  • Ability to extend existing Java classes in Jython - allows effective use of abstract classes.
  • Optional static compilation - allows creation of applets, servlets, beans, ...
  • Bean Properties - make use of Java packages much easier.
  • Python Language - combines remarkable power with very clear syntax. It also supports a full object-oriented programming model which makes it a natural fit for Java's OO design.

What Does Jython Do Well?

  • Prototyping
  • Java investigation 
    •     >>> from java.util import Date
    >>> d = Date()
    >>> print d
    Sat Jan 08 16:26:16 CST 2005
    >>> from java.util import Random
    >>> print dir(Random)
    ['__init__', 'nextBoolean', 'nextBytes', 'nextDouble', 'nextFloat',
    'nextGaussian', 'nextInt', 'nextLong', 'seed', 'setSeed']
    >>>
  • Making bean properties accessible 
    •     >>> print Date().time
    1105500911121
  • Glues together libraries already written in Java
  • Excellent embedded scripting language

Differences - Python & Jython

Python 2.7

  • C
  • Multi-platform
  • Compiles to .pyc
  • Extend with C

  • GIL 1

  • Python garbage collection, which mixes ref counting and mark and sweep

Jython 2.7

  • Written mostly in Java, does use Java Native Runtime for C access, but works with security manager restrictions
  • Java 7 or Java 8
  • Compiles to $py.class files
  • Extend with Java or C using JFFI; full CFFI, ctypes, and C Extension API support planned for the future
  • Truly multi-threaded
  • Java garbage collection, including choice of standard Java GCs; but also provides same API as Python 2.7 to observe GC

  1. Global Interpreter Lock, explained in [http://docs.python.org/api/threads.html Python documentation, chapter 8.1] (1)

WhyJython (last edited 2015-04-30 17:58:58 by JimBaker)