jython-users — Discussion of and questions about using Jython

[Jython-users] Re: [moving this from jython-dev] Per Samuele's request - Posted to jython-dev

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

Note: I moved the discussion to jython-users, at least about this.

This is about bound, unbound methods used from java side and a kind
of strange interaction with name binding level redefinitions for classes in 
a PythonInterp.

[Joseph Campbell]
> Samuele,
> Originally you had:
> 
> import org.python.core.*;
> import org.python.util.*;
> 
> public class Test {
> 
>   public static void main(String[] args) {
>     PythonInterpreter interp = new PythonInterpreter();
>     interp.exec("class A:\n def m(self,a,b):\n  print a,b");
>     PyClass A =(PyClass)interp.eval("A");
>     PyInstance a = (PyInstance)A.__call__();
>     PyObject m = A.__findattr__("m");    
>                                                     
>     interp.exec("class A:\n def m(self,a,b):\n  print b,a");
>     PyClass A2 =(PyClass)interp.eval("A");
>     PyInstance a2 = (PyInstance)A2.__call__();
>     PyObject m2 = A2.__findattr__("m");        
>     
>     m2.__call__(a2,new PyInteger(1),new PyInteger(2));
>     m.__call__(a,new PyInteger(1),new PyInteger(2)); 
>     
>   }
> }
> 
> Which I agree works just fine... however if you modify to look like the 
> following:

 
> import org.python.core.*;
> import org.python.util.*;
> 
> public class Test {
> 
>   public static void main(String[] args) {
>     PythonInterpreter interp = new PythonInterpreter();
>     interp.exec("class A:\n def m(self,a,b):\n  print a,b");
>     interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");
> 
>     PyClass class =(PyClass)interp.eval("B");
for my compiler to accept this, I should change class to clazz.

>     PyInstance instance = (PyInstance)class.__call__();
>     PyObject obj = instance.__findattr__("n");    
Differently from me you are retrieving the method from the instance, so you
get a bound method.

> 
> // This call works here.                                               
>     obj.__call__(instance,new PyInteger(1),new PyInteger(2)); 
This is the wrong way to spell the call to a bound method, no instance needed.
See later.

>          
>     interp.exec("class A:\n def m(self,a,b):\n  print a,b");
>     interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");
> 
> // This call doesn't work here.                                               
>     obj.__call__(instance,new PyInteger(1),new PyInteger(2));     
>   }
> }
> 
> You should get the Trace telling you you have to call the unbound method with 
> an instance first argument.
No, after the class -> clazz change I get:

Exception in thread "main" Traceback (innermost last):
  (no code object) at line 0
TypeError: n() too many arguments; expected 3 got 4

Making perfecly sense, OTOH both these versions work:

import org.python.core.*;
import org.python.util.*;

public class Test {

  public static void main(String[] args) {
    PythonInterpreter interp = new PythonInterpreter();
    interp.exec("class A:\n def m(self,a,b):\n  print a,b");
    interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");

    PyClass clazz =(PyClass)interp.eval("B");
    PyInstance instance = (PyInstance)clazz.__call__();
    PyObject obj = instance.__findattr__("n");
    System.out.println(obj);

// This call works here.                                               
    obj.__call__(new PyInteger(1),new PyInteger(2)); 
         
    interp.exec("class A:\n def m(self,a,b):\n  print a,b");
    interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");

// This call doesn't work here.                                               
    obj.__call__(new PyInteger(1),new PyInteger(2));     
  }
}

giving:
<method B.n of B instance at 5316106>
1 2
1 2

And:

import org.python.core.*;
import org.python.util.*;

public class Test {

  public static void main(String[] args) {
    PythonInterpreter interp = new PythonInterpreter();
    interp.exec("class A:\n def m(self,a,b):\n  print a,b");
    interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");

    PyClass clazz =(PyClass)interp.eval("B");
    PyInstance instance = (PyInstance)clazz.__call__();
    PyObject obj = clazz.__findattr__("n");
    System.out.println(obj);

// This call works here.                                               
    obj.__call__(instance,new PyInteger(1),new PyInteger(2)); 
         
    interp.exec("class A:\n def m(self,a,b):\n  print a,b");
    interp.exec("class B(A):\n def n(self,a,b):\n  print a,b");

// This call doesn't work here.                                               
    obj.__call__(instance,new PyInteger(1),new PyInteger(2));     
  }
}

giving:
<unbound method B.n>
1 2
1 2

The problem you get is more easely triggered through calling a method retrieved
from a new class on a old class version instance, or the other way around.
Hope this helps. OTOH I still don't see why simply redefining name bindings in the interp
namespace can cause the problem you report, methods do not refer to classes by name
but through a ref to the class first-class object. I'm still missing an example
causing your problem.

regards, Samuele Pedroni.

Re: [Jython-users] type conversions to Graphics2D

[D-Man <ds...@ri...>]

On Wed, Jul 18, 2001 at 10:10:47AM +0000, Mark Robinson wrote:
| Hi,
| 
| can anyone tell me how I should convert a Graphics object to a Graphics2D 
| object in jython.This is what I get:
| 
| Traceback (innermost last):
|   (no code object) at line 0
|   File "drawing.py", line 32
| 			g2 = (Graphics2D)g
| 	                                 ^
| SyntaxError: invalid syntax

Hehe, you're trying to do a C/C++/Java cast in Python :-).  Those
languages are all statically typed so you must tell the compiler that
you really have a Graphics2D object because it can't figure that out
for itself.  Python, on the other hand, is dynamically typed.  Since
you know you have a Graphics2D object, just use it! :-).
Python/Jython will check to make sure it really is the right object
when you call methods on it and it will just work!  This is one of the
features of Python that make it so easy and fun to use.

-D

Re: [Jython-users] Icons don't appear in GUI

[D-Man <ds...@ri...>]

On Wed, Jul 18, 2001 at 12:03:30PM +0200, Kevin McNamee wrote:
| 
| I have built a jar file from my python scripts
| > cd $HOME/work
| > jythonc -a -j demo.jar Gui.py
| 
| The GUI uses several gif files stored in 'icons', e.g.
|     rightIcon = swing.ImageIcon("icons/right.gif")
                                  ^^^^^^^^^^^^^^^^^

| 
| So I add these manually to the demo.jar
| > jar -uf demo.jar icons
| 
| I copy demo.jar to it's final location and run it
| > cp demo.jar /tmp
| > cd /tmp
| > java -jar demo.jar
| 
| The GUI starts, but none of the icons appear. If I create the icons
| directory locally and copy the icons there, then everything works fine.
| > mkdir icons
| > cp $HOME/work/icons/* icons
| > java -jar demo.jar
| 
| Why is demo.jar looking in ./icons instead of in demo.jar?

demo.jar doesn't look anywhere.  Your app specifies to look in the
filesystem (see highlighted path above).  What you want is (in Java) :

// you need the 'getResource' method with is found in instances of the
// 'Class' class
URL path = (new Object()).getClass().getResource( "/icons/right.gif" )
// now make the icon getting the gif from the url
ImageIcon = new ImageIcon( path )


If you are doing it from the Jython side use :

path = java.lang.Object().getClass().getResource( "/icons/right.gif")
icon = javax.swing.ImageIcon( path )

and it should work.  Be sure and print the url if it doesn't work so
you can see where getResource() thinks that resource is.

HTH,
-D

[Jython-users] type conversions to Graphics2D

[Mark R. <blo...@ho...>]

Hi,

can anyone tell me how I should convert a Graphics object to a Graphics2D 
object in jython.This is what I get:

Traceback (innermost last):
  (no code object) at line 0
  File "drawing.py", line 32
			g2 = (Graphics2D)g
	                                 ^
SyntaxError: invalid syntax

any ideas?

blobby
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[Jython-users] Icons don't appear in GUI

[Kevin M. <qk...@lm...>]

I have built a jar file from my python scripts
> cd $HOME/work
> jythonc -a -j demo.jar Gui.py

The GUI uses several gif files stored in 'icons', e.g.
    rightIcon = swing.ImageIcon("icons/right.gif")

So I add these manually to the demo.jar
> jar -uf demo.jar icons

I copy demo.jar to it's final location and run it
> cp demo.jar /tmp
> cd /tmp
> java -jar demo.jar

The GUI starts, but none of the icons appear. If I create the icons
directory locally and copy the icons there, then everything works fine.
> mkdir icons
> cp $HOME/work/icons/* icons
> java -jar demo.jar

Why is demo.jar looking in ./icons instead of in demo.jar?


_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

Re: [Jython-users] JTree and custom objects problem

[Kevin M. <qk...@lm...>]

Thanks. Works a treat.


On Tue, 17 Jul 2001, Jeff Emanuel wrote:

>
> You need to explicitly extend java.lang.Object.
>
> from java.lang import Object
> class CustomObject(Object):
>
>
>
>
>

_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

[Jython-users] JTree and custom objects problem

[Kevin M. <qk...@lm...>]

Thanks for all the help so far.

I am trying to use a tree in a splitpane. I am using the Java Swing
tutorial on trees as a reference
http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html

According to this, if I add a custom object to the tree I must implement
it's toString method. But it doesn't seem to work:


from pawt import swing

Node = swing.tree.DefaultMutableTreeNode

class CustomObject:
	def __init__(self, key, value):
		self.key = key
		self.value = value

	def toString(self):
		print "toString: ", self.key
		return self.key

top=Node("Test")
top.add(Node(CustomObject("key","value")))
tree=swing.JTree(top)

frame=swing.JFrame()
frame.getContentPane().add(tree)
frame.visible=1



_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

Re: [Jython-users] Problems importing win32com module. HELP!

[D-Man <ds...@ri...>]

On Mon, Jul 16, 2001 at 04:23:20PM -0400, Freeze, Deron wrote:
| 
| Trying to execute some python in a Java program I have. This code
| uses the win32com module to access a COM component. The interpreter

Are you using Microsoft's JVM?  I've heard that it supports COM, but
I've never looked into it.  AFAIK Sun's JVM doesn't support COM
because COM is an MS-only technology.

Where did you get the win32com package from?  If you got it from Mark
Hammond or ActiveState then it probably requires CPython because it is
a C extension that provides a Python interface to the Windows COM
system.  The CPython win32all extensions won't work with Jython
because Jython is restricted to using only features that are available
to Java code.

A possible solution would be to use ILU to use the COM stuff in
CPython and the Java stuff in Jython or use something like XML-RPC or
CORBA to communicate the logic you need to between COM stuff in
CPython and Java stuff in Jython.

HTH,
-D

[Jython-users] Problems importing win32com module. HELP!

[Freeze, D. <der...@ma...>]

Trying to execute some python in a Java program I have. This code
uses the win32com module to access a COM component. The interpreter
has no problem finding the win32com module (I set the python.path
on the command line when I start the JVM, -dpython.path).

When the win32com module is loaded it attempts to load win32api
module in another directory, and an exception occurs.

Here's a snippet of my code:
===========================================================================
  public static void main(String []args) throws PyException
  {
      PythonInterpreter interp = new PythonInterpreter();

      System.out.println("Loading Python modules...");
      interp.exec("import sys; print sys.path");

      interp.exec("import win32com.client");
      interp.exec("x1 = win32com.client.Dispatch(\"MyApp.1\")");

  }
===========================================================================

output (with error) is:

Loading Python modules...
['.', 'C:\\project\\lib\\Lib', 'C:\\python21', 'c:\\python21\\pythonwin',
'c:\
\python21\\win32', 'c:\\python21\\win32\\lib', 'c:\\python21\\dlls',
'c:\\python
21\\lib', 'c:\\python21\\lib\\plat-win', 'c:\\python21\\lib\\lib-tk',
'c:\\pytho
n21\\win32comext', 'C:\\Python21\\win32com\\client']

Exception in thread "main" Traceback (innermost last):
  File "<string>", line 1, in ?
  File "C:\Python21\win32com\__init__.py", line 5, in ?
ImportError: no module named win32api

===========================================================================

Re: [Jython-users] type of an object?

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

D-,

>On Mon, Jul 16, 2001 at 07:37:04PM +0100, Ype Kingma wrote:
>| Kevin,
>|
>| >Is there anyway to find out the type of an object? E.g.
>| >
>| >>>> a = 1
>| >>>> a.isa(int)
>| >1
>|
>| Apart from instanceof() (other post) you can also use:
>
>Heh, too much Java for you too :-).
>
>'instanceof' is a builtin operator in Java, not Python.

<poco a poco piu agitato>
Oops :( , I think I have done too much thread scheduling lately:
notify(), notifyAll() and wait() have almost the same meaning.
This instanceof thing bit me a few times already.
Now, who added the colon to the if, while, for, def, class,
_and_ try statements? Wasn't that the same guy who designed
the Python threads to be "loosely based on Java"?
The guy who seems to have said that JPython could not be done?
</poco>
And all that in _my_ favourite programming language?

Ype

Re: [Jython-users] type of an object?

[D-Man <ds...@ri...>]

On Mon, Jul 16, 2001 at 07:37:04PM +0100, Ype Kingma wrote:
| Kevin,
| 
| >Is there anyway to find out the type of an object? E.g.
| >
| >>>> a = 1
| >>>> a.isa(int)
| >1
| 
| Apart from instanceof() (other post) you can also use:

Heh, too much Java for you too :-).

'instanceof' is a builtin operator in Java, not Python.

-D

Re: [Jython-users] type of an object?

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

Kevin,

>Is there anyway to find out the type of an object? E.g.
>
>>>> a = 1
>>>> a.isa(int)
>1

Apart from instanceof() (other post) you can also use:

type(a) == type(1)

Ype

FW: Re: [Jython-users] type of an object?

[D-Man <ds...@ri...>]

----- Forwarded message from Jeff Emanuel <je...@ad...> -----
From: Jeff Emanuel <je...@ad...>
Date: Mon, 16 Jul 2001 10:27:04 -0600
To: D-Man <ds...@ri...>
X-Mailer: Mozilla 4.7 [en] (WinNT; U)

D-Man wrote:
> [ aside :  Hey, where'd "isInstance" go? ]

Lower case i.  isinstance
----- End forwarded message -----

Doh!  Too much Java.  (Thanks for the correction)

Ok, for the benefit of the OP here is a working example :-).

>>> import types
>>> a = 1
>>> isinstance( a , types.IntType )
1
>>> class Foo : pass
...
>>> b = Foo()
>>> isinstance( b , Foo )
1
>>> class Bar( Foo ) : pass
...
>>> c = Bar()
>>> isinstance( c , Foo )
1

-D

Re: [Jython-users] type of an object?

[D-Man <ds...@ri...>]

On Mon, Jul 16, 2001 at 05:00:19PM +0200, Kevin McNamee wrote:
| Is there anyway to find out the type of an object? E.g.
| 
| >>> a = 1
| >>> a.isa(int)
| 1

>>> a=1
>>> type( a )
<jclass org.python.core.PyInteger at 6284031>
>>> import types
>>> print type(a) == types.IntType
1
>>> print a.__class__
org.python.core.PyInteger
>>> print isInstance( a , types.IntType )
Traceback (innermost last):
  File "<console>", line 1, in ?
NameError: isInstance
>>>

[ aside :  Hey, where'd "isInstance" go? ]

Check out the 'types' module too.  That is good for built-in types
which, in CPython but not Jython, are different from class instances.
The isInstance function is better because it works with classes too.
The only problem with it is I don't know what object to pass in as the
"class" of the built-in types.  (Also it doesn't seem to be a built-in
function in Jython)

HTH,
-D

[Jython-users] type of an object?

[Kevin M. <qk...@lm...>]

Is there anyway to find out the type of an object? E.g.

>>> a = 1
>>> a.isa(int)
1





_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165
E-Mail     : kev...@er...

Re: [Jython-users] Boolean question

[Steve Y. <st...@ca...>]

Thanks!!

-steve

Kevin Butler writes:
 > Steve Yegge wrote:
 > 
 > > I've found a case where it doesn't work:
 > >
 > >      from java.lang import Boolean
 > >      ...
 > >      obj.setProperty("foobar", Boolean.FALSE)
 > >
 > > I also tried:
 > >
 > >      obj.setProperty("foobar", 0)
 > >
 > > but that somehow turns 0 into an int value and uses that,
 > > where I really wanted a boolean.
 > >
 > 
 > I didn't see a public answer for this question, so here goes.
 > 
 > >>> from java.lang import *
 > >>> from java.util import *
 > >>> m = HashMap()
 > >>> m.put( "one", Boolean.FALSE )
 > >>> m.put( "two", Boolean( 0 ) )
 > >>> m
 > {two=false, one=0}
 > >>>
 > 
 > The problem is that jython converts the Boolean.FALSE to an 'int' for
 > you to work with in jython (normal attribute access, etc.).  To pass in
 > a Boolean object, you need to explicitly specify it via constructing one
 > as your parameter.
 > 
 > >>> Boolean.FALSE
 > 0
 > >>> Boolean( Boolean.FALSE )
 > false
 > >>>
 > 
 > kb
 > 

Re: [Jython-users] Boolean question

[Kevin B. <kb...@ca...>]

Steve Yegge wrote:

> I've found a case where it doesn't work:
>
>      from java.lang import Boolean
>      ...
>      obj.setProperty("foobar", Boolean.FALSE)
>
> I also tried:
>
>      obj.setProperty("foobar", 0)
>
> but that somehow turns 0 into an int value and uses that,
> where I really wanted a boolean.
>

I didn't see a public answer for this question, so here goes.

>>> from java.lang import *
>>> from java.util import *
>>> m = HashMap()
>>> m.put( "one", Boolean.FALSE )
>>> m.put( "two", Boolean( 0 ) )
>>> m
{two=false, one=0}
>>>

The problem is that jython converts the Boolean.FALSE to an 'int' for
you to work with in jython (normal attribute access, etc.).  To pass in
a Boolean object, you need to explicitly specify it via constructing one
as your parameter.

>>> Boolean.FALSE
0
>>> Boolean( Boolean.FALSE )
false
>>>

kb

[Jython-users] Re: GridBagConstraints

[Daniel L. <da...@br...>]

> How do I apply constraints to a GridBag?
>
>>>> from pawt import swing, awt, GridBag
>>>>
>>>> frame = swing.JFrame()
>>>> c = awt.GridBagConstraints()
>>>> button = swing.JButton()
>>>> gridbag = GridBag(frame.contentPane)
>>>> gridbag.setConstraints(button,c)
> Traceback (innermost last):
>   File "<console>", line 1, in ?
> AttributeError: setConstraints
>>>>

Generally, replace the key word for the Java accessor methods
"get" and "set" with just the field name,
e.g. gridBag.setConstraints --> gridBag.constraints

I have used GridBagLayout very successfully in Jython. Now custom
cell renderers in JTable, well that's a different issue ;-)

Re: [Jython-users] annoying error msgs

[D-Man <ds...@ri...>]

On Thu, Jul 12, 2001 at 05:33:29PM +0100, Mark blobby Robinson wrote:
| Hi,
| 
| I have just installed jython 2.0  and just wondering if anyone can help 
| me get rid of a pile of warnings that I get everytime I run the swing 
| demos i.e simple.py. I am running red hat 6.0 and the warnings are:
| 
| Font specified in font.properties not found 
| [--symbol-medium-r-normal--*-%d-*-*-p-*-adobe-fontspecific]
| 
| other than that, the program seems to run fine, but I'd really 
| appreciate being able to either change the font specification or add the 
| required font ever the prog is wanting and not finding, anyone know how?

This is swing stuff.  I'd just ignore it.  I get lots of font warnings
when I run swing stuff on a *nix box xhosted by a win box.

However, your error message says the font is specified in
font.properties.  If you could find that file you could change it.
Alternatively you could install that font and then it would be found
(probably better if you want to have better/more fonts available).

-D

[Jython-users] annoying error msgs

[Mark b. R. <m.1...@he...>]

Hi,

I have just installed jython 2.0  and just wondering if anyone can help 
me get rid of a pile of warnings that I get everytime I run the swing 
demos i.e simple.py. I am running red hat 6.0 and the warnings are:

Font specified in font.properties not found 
[--symbol-medium-r-normal--*-%d-*-*-p-*-adobe-fontspecific]

other than that, the program seems to run fine, but I'd really 
appreciate being able to either change the font specification or add the 
required font ever the prog is wanting and not finding, anyone know how?

blobby

Re: [Jython-users] Making a class that acts as both a Python object and a Java object

[Kevin D. <kda...@we...>]

As a followup, here's a bit of code that illustrates:

public class MyClass extends SomePyThing
{
    public int sum(int val1, int val2)
    {
        return val1 + val2;
    }
}

--jython--
import MyClass
a = MyClass()
a.foo = 2
a.bar = 4
a.sum(a.foo, a.bar)

With a standard Java class, a.foo=2 would fail. With a subclass of
PyInstance, a.foo = 2 would work, but a.sum(...) would fail (AttributeError,
because it can't find the method since reflection isn't used).

Kevin

----- Original Message -----
From: "Kevin Dangoor" <kda...@we...>
To: <jyt...@li...>
Sent: Thursday, July 12, 2001 11:11 AM
Subject: [Jython-users] Making a class that acts as both a Python object and
a Java object


>     Jython does a great job emulating Python objects in Java. It also,
> through reflection, does a great job of letting you use Java methods, etc.
> in Jython. It seems like it would be useful to have a base class that
gives
> you both sets of behavior out of the box:
>
> - it would have a __dict__ to store things in
> - it would use reflection to find out about Java methods
> - it would look like a python class and allow you to use Jython's multiple
> inheritance mechanism
>
> This type of thing would allow you to easily build all sorts of extensions
> to Jython. In situations where someone is more comfortable or it is more
> convenient to do something in Java, you can still make objects that look
> like python objects to Jython programs.
>
> I'm just coming back to this after a couple of weeks away, but if memory
> serves subclassing PyObject doesn't give __dict__ or reflection.
Subclassing
> PyInstance does give you a functional __dict__, but doesn't do reflection.
> Subclassing PyClass actually can give both but PyClasses are not quite the
> same. And there are a lot of private and protected members in there which
> prevent easy subclassing.
>
> Has anyone else been interested in such a thing? Any suggestions on an
> approach to take?
>
> Thanks,
> Kevin
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] Making a class that acts as both a Python object and a Java object

[Kevin D. <kda...@we...>]

    Jython does a great job emulating Python objects in Java. It also,
through reflection, does a great job of letting you use Java methods, etc.
in Jython. It seems like it would be useful to have a base class that gives
you both sets of behavior out of the box:

- it would have a __dict__ to store things in
- it would use reflection to find out about Java methods
- it would look like a python class and allow you to use Jython's multiple
inheritance mechanism

This type of thing would allow you to easily build all sorts of extensions
to Jython. In situations where someone is more comfortable or it is more
convenient to do something in Java, you can still make objects that look
like python objects to Jython programs.

I'm just coming back to this after a couple of weeks away, but if memory
serves subclassing PyObject doesn't give __dict__ or reflection. Subclassing
PyInstance does give you a functional __dict__, but doesn't do reflection.
Subclassing PyClass actually can give both but PyClasses are not quite the
same. And there are a lot of private and protected members in there which
prevent easy subclassing.

Has anyone else been interested in such a thing? Any suggestions on an
approach to take?

Thanks,
Kevin

Re: [Jython-users] coercing Dictionaries to java.util.Map or

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

Hi.

> hi,
> 
> i am somehow surprised that this is not possible
> 
> >>JAVA
> public void addRow(Dictionary _row)
> >>JYTHON
> addRow({})
> 
> but instead prints the following errormsg:
> >>TypeError: addRow(): 1st arg can't be coerced to java.util.Dictionary
> 
> where is the problem to convert a org.python.core.PyDictionary
> into a java.util.Dictionary or even better into java.util.Map?
So just propose a patch <wink>.

Some refs and a partial/tentative discussion of potential issues is at:

http://www.geocrawler.com/archives/3/7017/2001/6/50/5904682/

regards, Samuele Pedroni.

Re: [Jython-users] setConstraints?

[D-Man <ds...@ri...>]

On Thu, Jul 12, 2001 at 02:13:36PM +0200, Kevin McNamee wrote:
| How do I apply constraints to a GridBag?
| 
| >>> from pawt import swing, awt, GridBag
| >>>
| >>> frame = swing.JFrame()
| >>> c = awt.GridBagConstraints()
| >>> button = swing.JButton()
| >>> gridbag = GridBag(frame.contentPane)
| >>> gridbag.setConstraints(button,c)
| Traceback (innermost last):
|   File "<console>", line 1, in ?
| AttributeError: setConstraints
| >>>

>>> dir( gridbag )
['defaults', 'frame', 'gridbag']
>>> print gridbag.gridbag
java.awt.GridBagLayout
>>> dir( gridbag.gridbag )
[]
>>> dir( gridbag.gridbag.__class__ )
['__init__', 'addLayoutComponent', 'columnWeights', 'columnWidths',
'getConstraints', 'getLayoutDimensions', 'getLayoutOrigin',
'getLayoutWeights', 'layoutDimensions', 'layoutOrigin',
'layoutWeights', 'location', 'rowHeights', 'rowWeights',
'setConstraints']
>>> gridbag.gridbag.setConstraints(button,c)
            ^^^^^^^^

I hope the interactive session above gives you a hint how to find
these sort of things out, as well as the answer to your question :-).

-D

[Jython-users] coercing Dictionaries to java.util.Map or

[Robert K. <rob...@ya...>]

hi,

i am somehow surprised that this is not possible

>>JAVA
public void addRow(Dictionary _row)
>>JYTHON
addRow({})

but instead prints the following errormsg:
>>TypeError: addRow(): 1st arg can't be coerced to java.util.Dictionary

where is the problem to convert a org.python.core.PyDictionary
into a java.util.Dictionary or even better into java.util.Map?

ciao robertj



=====
itemj
http://www.itemj.com
Robert Kuzelj          
Gaissacherstrasse 7
81371 Muenchen         
tel 0177  5302230

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