Re: [Jython-users] Looking for Jython promo materials

[Brian Z. <bri...@ya...>]

Hi Brad,

For 1 and 2, http://www.python.org/doc/essays/ppt/lwnyc2002/intro22.ppt
seems very good.

As to the example, IMO interactively explore some java API would open eyes
for VB and Perl programmers. Features like built-in list, dictionary,
slicing probably are easier to demonstrate than polymorphic dynamic OO. Here
are some examples I often use:

1) java.vm.version

>>> from java.lang import System
>>> dir(System)
['arraycopy', 'currentTimeMillis', 'err', 'exit', 'gc', 'getProperties',
'getProperty', 'getSecurityManager', 'getenv', 'identityHashCode', 'in',
'load', 'loadLibrary', 'mapLibraryName', 'out', 'runFinalization',
'runFinalizersOnExit', 'setErr', 'setIn', 'setOut', 'setProperties',
'setProperty', 'setSecurityManager']
>>> props = System.getProperties()
>>> props.__class__
<jclass java.util.Properties at 7576227>
>>> props.__class__.__bases__
(<jclass java.util.Hashtable at 3325456>,)
>>> for k in props.keys():
...     if k.startswith('java.vm.'):
...         print k
...
java.vm.version
java.vm.vendor
java.vm.name
java.vm.specification.name
java.vm.specification.vendor
java.vm.specification.version
java.vm.info
>>> props['java.vm.version']
'1.3.1_02-b02'

2) exercise from SICP book in python
>>> def subsets(aList):
...     if [] == aList: return [ [] ]
...     else:
...         rest = subsets(aList[1:])
...         return rest + [ [aList[0]] + x for x in rest ]
...
>>> subsets([1,2,3])
[[], [3], [2], [2, 3], [1], [1, 3], [1, 2], [1, 2, 3]]

3) swing calculator (put it in swingCalc.py)
############################################
# evaluation runs a full expression all at
# once using the Python eval() built-in--
# interpreter is present at run-time
############################################

from java import awt                   # get access to Java class libraries
from pawt import swing                 # they look like Python modules here

labels = ['0', '1', '2', '+',          # labels for calculator buttons
          '3', '4', '5', '-',          # will be used for a 4x4 grid
          '6', '7', '8', '*',
          '9', '.', '=', '/' ]

keys = swing.JPanel(awt.GridLayout(4, 4))     # do Java class library magic
display = swing.JTextField()                  # Python data auto-mapped to
Java

def push(event):                              # callback for regular keys
    display.replaceSelection(event.actionCommand)

def enter(event):                             # callback for the '=' key
    display.text = str(eval(display.text))    # use Python eval() to run
expr
    display.selectAll()

for label in labels:                          # build up button widget grid
    key = swing.JButton(label)                # on press, invoke Python
funcs
    if label == '=':
        key.actionPerformed = enter
    else:
        key.actionPerformed = push
    keys.add(key)

panel = swing.JPanel(awt.BorderLayout())      # make a swing panel
panel.add("North", display)                   # text plus key grid in middle
panel.add("Center", keys)
swing.test(panel)                             # start in a GUI viewer


BTW, Thank you for the excellent PythonCE work, I really enjoy using it!

-Brian

----- Original Message -----
From: "Brad Clements" <bk...@mu...>
To: <jyt...@li...>
Sent: Thursday, March 14, 2002 7:23 PM
Subject: [Jython-users] Looking for Jython promo materials


> Next week I need to give a one hour presentation at Novell's Brainshare
titled:
>
> "Rapid Application Development with Jython".
>
> I'll be demo'ing Jedit, JythonInterpreter (plugin), JinSitu and of course
Jython, on Win32
> and NetWare Systems.
>
> I have a simple Beans based application that I'll be showing, but I'm
looking for some
> other things:
>
> 1. Quick intro to the Python Language (10 minutes)
>
> 2. Perhaps a Power Point slide show for item 1
>
> 3. Quick examples that I can type interactively that demonstrate the power
of the
> interpreted, typeless nature of Jython.
>
> I'm aware of what's available at python.org and jython.org, but if you
have any other
> recommendations I'd appreciate it.
>
> My audience will be in-experienced VB'ers/Perlers.. And experienced Java
developers.
>
> Thanks for any suggestions,
>
>
>
>
> Brad Clements,                bk...@mu...   (315)268-1000
> http://www.murkworks.com                          (315)268-9812 Fax
> AOL-IM: BKClements
>
>
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