jython-users

[Jython-users] Looking for Jython promo materials

[Brad C. <bk...@mu...>]

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

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

[Syver E. <syv...@on...>]

"Brad Clements" <bk...@mu...> writes:

> Next week I need to give a one hour presentation at Novell's
> Brainshare titled:
> 

> "Rapid Application Development with Jython".
> 3. Quick examples that I can type interactively that demonstrate the
> power of the interpreted, typeless nature of Jython.

I always found Jython excellent for investigating unfamiliar
API's. Maybe you can use some JAVA api for an example. Maybe some JDBC stuff?

A minor quibble, Jython is strongly typed not typeless. But it is
dynamically and not statically typed (but you already knew that). I
think that (J/P)ython is very different from languages were all the
objects are autocasting themselves in that you aren't aware of what
types are really used before something goes Ka-Boom, Jscript and
VBScript springs to mind.

-- 

Vennlig hilsen 

Syver Enstad

[Jython-users] Jython, GUIs and Design

[Stephen N. <ste...@co...>]

I intend to code a Graphical User Interface using Jython.  I would like
to structure the GUI class design using Object Oriented priniciples.  I
have looked at some design patterns, inparticular Model-View-Controller
(MVC) and HMVC.  Do any of you have any recommendation as to how to
structure the GUI?

Thanks 

Stephen

[Jython-users] synchronized

[Stephen N. <ste...@co...>]

I'm porting some Java code to Jython.  How woould I write a synchronised
block?

synchronized(some_object){
	//code
}

Thanks

Stephen

Re: [Jython-users] synchronized

[Samuele P. <pe...@in...>]

From: Stephen Naicken <ste...@co...>
> I'm porting some Java code to Jython.  How woould I write a synchronised
> block?
> 
> synchronized(some_object){
> //code
> }
> 
> Thanks
> 
> Stephen

For methods:

import synchronize

class C:
  def m(self):
     ... stuff ...
  m = synchronize.make_synchronized(m)

For you specific idiom:

you should put code in local/global function
or use lambda and

from synchornize import apply_synchronized

def code():
   ... # your code

...
apply_synchronized(some_object,code,())
# apply_synchronized(some_object,lambda: code,())

regards.

Re: [Jython-users] synchronized

[Samuele P. <pe...@in...>]

[me on synchronize built-in module]

obviously that was the direct translation,

otherwise you can use the synchronization
primitives of python threading.py:

http://www.python.org/doc/2.1/lib/module-threading.html

Or look at this Ype Kigma's post:

http://aspn.activestate.com/ASPN/Mail/Message/828840

regards.

Re: [Jython-users] synchronized

[Ype K. <yk...@xs...>]

Stephen,

>I'm porting some Java code to Jython.  How woould I write a synchronised
>block?
>
>synchronized(some_object){
>	//code
>}

Have a look at
http://mail.python.org/pipermail/jpython-interest/2000-August/003718.html

It contains an example on how to synchronize a method on the object
it is invoked on.

You can also use a Lock from the thread module and explicity
acquire and release it. This could be a bit slower, but it's
more straightforward when your code is not a complete method.

If you need the performance of the java synchronized
construct,  you can also leave the code in java.

>Thanks

My pleasure,
Ype

-- 

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
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

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

[Syver E. <syv...@on...>]

"Brad Clements" <bk...@mu...> writes:

> On 15 Mar 2002 at 14:29, Syver Enstad wrote:
> > A minor quibble, Jython is strongly typed not typeless. But it is
> > dynamically and not statically typed (but you already knew that). I
> 
> Good point. It is an important distinction. 

Yeah, not least because there are some people out there that have made up
their mind that strong typing is good, weak typing is bad. They tend
to look at that in terms of static/dynamic typing, so it's nice to be
able to whack them on the head with: python is indeed strongly typed,
it's just that it is dynamically typed :-).

-- 

Vennlig hilsen 

Syver Enstad