APAC PyCon 2011

Senthil Kumaran

- CPython Core Developer

- Engineer at Lucasfilm, Singapore.

Seeing Python as a language reference.

CPython is only one of the implementation So is PyPy, Jython, IronPython, CLPython And some language implementation that you can write too

• It is called CPython

• Also known as Python, naturally.

• 3.3 - Under Development at http://hg.python.org/cpython

• 3.2.1 - Mid June, 2011 - Georg Brandl

• 2.7.2 - Mid June, 2011 - Benjamin Peterson

• 3.1.4 - Mid June, 2011 - Benjamin Peterson

• 2.6.7 - 3 - June, 2011 - Barry Warsaw

• Windows Installers by Martin and Mac Installers by Ronald or Ned Deily.

• Breaking from it's roots.

• Moving away from it's C Background.

• Modern Frameworks and Advanced Applications.

• Taking good points from Java and others.

• Fixing a lot of Language warts.

• http://py3ksupport.appspot.com/

• Numpy Supports

• Support not fast in WebFramework world because of the need to sort out WSGI spec.

• Support is steady and moving forward.

• People use it (and ask questions at various forums)

• Jython is implementation of the Python programming language written in Java.

• The language syntax and semantics will be same as Python.

• Import and use any Java class.

• Except for some standard modules, Jython programs use Java classes instead of Python modules

• You are from the Java world and do not want to feel away from home.

• Dynamic compilation to Java bytecodes.

• Ability to extend existing Java classes in Jython.

• Optional static compilation - Applets, Servlets and beans

• Prototyping (using Java semantics)

• Java investigation of classes.

• Glues together libraries already written in Java.

• Runs on any JVM above 1.1

• Truly multi-threaded (no GIL) and Java garbage collected.

>>> from java.util import Date
>>> d = Date()
>>> print d
Fri Jun 10 09:08:58 SGT 2011
>>> import sys
>>> sys.path

# [..,'__classpath__', ... ]

from java import awt

class SpamListener(awt.event.ActionListener):
    def actionPerformed(self,event):
        if event.getActionCommand() == "Spam":
            print 'Spam and eggs!'

f = awt.Frame("Subclassing Example")
b = awt.Button("Spam")
b.addActionListener(SpamListener())
f.add(b, "Center")
f.pack()
f.setVisible(1)

• Current Jython is compatible with CPython reference implementation 2.5.2

• Supports Popular Python frameworks such as Django, Pylons, or SQLAlchemy.

• Scripting support in IBM WebLogic and Websphere application server.

• ZK Java Ajax Framework Support.

• virtualenv, easy_install

• apt-get install jython

• Or Download and java -jar jython-2.5.2.jar

• On All platforms which support Java Standard Edition.

• Not Java Mobile Edition, so not for Android.

Performance to CPython is comparable to slower in general. Multi-threaded applications can be faster.

The good news is, it is not just an extension language, but complete programming language suitable for application development.

IronPython is an implementation of the Python programming language targeting the .NET Framework and Mono.

• IronPython can use the .NET Framework and Python libraries, and other .NET languages can use Python code just as easily.

• Release 2.7 was released on March 12, 2011 and it targets CPython 2.7.

• IronPython 2.7 installer available for Windows Platform, as Desktop and Server Apps.

• Pre-requisite include .NET 4.0 or Silverlight 4.

• Also supports Browser apps development via Silverlight - Browser App for Mac and Windows.

• via Mono - desktop app for Linux and Mac.

• via Moonlight plugin - as browser app for Linux.

• Corporate credibility, when company uses .Net technologies.

• No GlobalInterpreterLock - IronPython has no GIL and multi-threaded code can use multi core processors

• The .NET framework library is very big. Windows Forms support.

• Easier to extend than CPython (C# is memory managed and C# types can be used directly in IronPython with no wrapping)

• An extensibility layer to application frameworks written in a .NET language.

• Silverlight!

import clr
clr.AddReference("System.Windows.Forms")

from System.Windows.Forms import MessageBox
MessageBox.Show("Hello World")

• Numpy, and Scipy support via IronClad

• Django on only with lot of hacks

• http://www.silverlight.net/learn/dynamic-languages/#example_applications

• http://ironpython.net/try

Also supported in:

• The Microsoft Robotics Kit

• XNA: 3D and Games Programming Framework

PyPy is a Python Interpreter written in Python and it is a JIT Compiler. It focusses on Speed, Efficiency and 100% CPython compatibility.

• It is just your normal pure python code!

• Just run it against pypy interpreter.

• CPython 2.7.1 compatible. It runs on 32- and 64-bit Intel x86 architecture and includes a JIT compiler.

• A plenty. Pylons, Pyglet, Nevow and Django.

• Almost anything that does not involve ctypes module.

• Tkinter and IDLE with PyPy

• Numpy integration is in progress.

• It's all about Speed.

http://speed.pypy.org/

• It's Python Language!

• Choose the implementation which suits you most

• Work alongside other languages and frameworks.