jython-users — Discussion of and questions about using Jython

Re: [Jython-users] multi-line string exec/eval

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

Hi.

[Jim Aldrig]
> Mark Ackerman wrote:
> > 
> > I've got an embedded Jython interpretor as my glue in a java program.
> > I'm trying to do an exec or eval (both actually), sending an entire program
> > in as a string.  It's not working.  I can use the exact same program as
> > a file using execfile, and then it's fine.
> > 
> > Any suggestions?  I'm using \n as my line delimiter, if that helps.
> 
> It doesn't work like that: 'exec' only takes one 'unit' of code;
Just to avoid confusion, that's false.

interp.exec takes the same arg "as" the exec statement:

http://www.python.org/doc/current/ref/exec.html

e.g. the following example works for me:


import org.python.util.* ;

public class interp {

  public static void main(String[] args) {

  	PythonInterpreter interp = new PythonInterpreter();
  	
  	String x = "a,b=1,1\nif a:\n print 3\nif b:\n print 5";
  	
  	interp.exec(x);
  }


}


Clearly one should pay attention to indentation.
Passing chunks of code, e.g. incomplete compound statements does not work, OTOH.

regards, Samuele Pedroni.

Re: [Jython-users] Importing and using nested classes

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

Hi.

[mhagger]
> 
> It doesn't help:
> 
> $ jython
> Jython 2.0 on java1.3.1 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> >>> import testlib
> >>> print testlib   
> testlib
> >>> print testlib.B
> testlib.B
> >>> print testlib.B.C
> Traceback (innermost last):
>   File "<console>", line 1, in ?
> AttributeError: class 'testlib.B' has no attribute 'C'
> >>> 
> 
Your troubles are of a buggy nature. I have added a bug report:
	"using nested java cls @ level >2 fails"
	
http://sourceforge.net/tracker/index.php?func=detail&aid=440660&group_id=12867&atid=112867

Thanks for the report. 

regards, Samuele Pedroni.

[Jython-users] setConstraints?

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

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
>>>


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

[Jython-users] Using Jython 4 Apache-Zope-MySQL Configuration

[daChosen O. <a_...@ho...>]

Hello,
I am a new Zope user and am looking to embark on a project using the
aboved-named configuration. I have already configured Apache to pass request 
for Zope Content to the ZServer. The snag I have is actually doing the 
scripting with Jython and Java classes as opposed to Python/Perl. The 
materials available on Zope are geared towards setting up for Python.

There seem not to be any materials on setting up the back-end
(Zope-MySQL) for Jython/Java development.

Has anyone tried this combination before ? If so would require some
assistance on setting up.


Thanks in Anticipation,

da Chosen1
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

[Jython-users] Boolean question

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

Hi folks,

I've been using Jython for well over a year, and it has
served me faithfully without a hitch.  I'm using it in an
online role-playing game (http://www.cabochon.com) with
thousands of active players, and I use my embedded jython
interpreter(s) literally every day.

I've run across an interesting problem.  My game object
tree has a base class (GameObject) that has a hashtable
of properties, and one of the possible property values is
type boolean.  Usually jython figures out what I'm trying 
to do and converts the value '0' to Java's 'false'.

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.

My base class has the following relevant methods:

   public void setIntProperty(String name, int value)
   public void setProperty(String name, Object value)

(Notice how I've basically cloned jython's object-property
list in java - I started before jython was availible.  Sorry.)
Presumably it's the second method that's being invoked here.

So when I try to setProperty with Boolean.FALSE, jython
somehow actually converts the Boolean.FALSE to a zero,
and then winds up setting the property with an int value of 0
instead of a boolean value of true.  Unfortunately, that dorks
my code that's expecting the value to be a boolean.  In case
you were wondering, it means I can't uncurse certain rings in
the game - funny how these issues translate into real bugs.

Sooo... is there any way to force jython to invoke my method
with a value that corresponds to the Java boolean value of
'false', rather than an int zero?

Thanks much,

-steve

Re: [Jython-users] multi-line string exec/eval

[Jim A. <ji...@tr...>]

Mark Ackerman wrote:
> 
> I've got an embedded Jython interpretor as my glue in a java program.
> I'm trying to do an exec or eval (both actually), sending an entire program
> in as a string.  It's not working.  I can use the exact same program as
> a file using execfile, and then it's fine.
> 
> Any suggestions?  I'm using \n as my line delimiter, if that helps.

It doesn't work like that: 'exec' only takes one 'unit' of code;
although you can define a function like this:

interp.exec(
           "def prt(x): \n" +
           "  print x \n" +
           "  for i in x: \n" +
           "    print i, \n" +
           "  print x.__class__\n");

(from Bruce Eckel's 'Thinking in Patterns' chap 9, the 'Interpreter
Pattern'; worth downloading from
http://www.mindview.net/Books/TIPatterns/ )

or multi-line if/for statements.

But other than that you can't run multiple lines: that is what
'execfile' is for. Note that 'execfile' DOES take an InputStream so you
can send it code from any source.

Or just put 'exec' in a loop.

Of course 'eval' takes only an EXPRESSION (and returns a result...).

-- 
                                 __o
Jim Adrig                      _ \<,_
ji...@tr...          ' `/ ' `
                  ___________ `-'  `-'


"There are many ways of moving forward,
 but only one way of standing still."
                                 - Franklin D. Roosevelt

[Jython-users] multi-line string exec/eval

[Mark A. <ack...@go...>]

I've got an embedded Jython interpretor as my glue in a java program.
I'm trying to do an exec or eval (both actually), sending an entire program
in as a string.  It's not working.  I can use the exact same program as
a file using execfile, and then it's fine.

Any suggestions?  I'm using \n as my line delimiter, if that helps.

                        Mark

[Jython-users] multi-line string exec/eval

[Mark A. <ack...@go...>]

I've got an embedded Jython interpretor as my glue in a java program.
I'm trying to do an exec or eval (both actually), sending an entire program
in as a string.  It's not working.  I can use the exact same program as
a file using execfile, and then it's fine.  

Any suggestions?  I'm using \n as my line delimiter, if that helps.

			Mark

Re: [Jython-users] Importing and using nested classes

[Michael H. <mh...@al...>]

D-Man writes:
> Instead try this and see if it helps :
> 
> #!/usr/bin/env jython
> import testlib
> 
> print testlib.B
> print testlib.B.C

It doesn't help:

$ jython
Jython 2.0 on java1.3.1 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import testlib
>>> print testlib   
testlib
>>> print testlib.B
testlib.B
>>> print testlib.B.C
Traceback (innermost last):
  File "<console>", line 1, in ?
AttributeError: class 'testlib.B' has no attribute 'C'
>>> 

--
Michael Haggerty
mh...@al...

Re: [Jython-users] Importing and using nested classes

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

On Wed, Jul 11, 2001 at 01:40:37PM +0200, Michael Haggerty wrote:
| Hello,
| 
| I'm new to Jython and to Java, so I might be trying things that are
| just nonsense.  But I am having trouble importing and using
| multiply-nested java classes using jython.  The following illustrates
| the problem:

| In test.py:
| 
| #! /usr/bin/env jython
| 
| import testlib
| import testlib.B
| import testlib.B.C

import is usually only used with modules or packages.  With Jython,
however, you can import top-level classes.

Instead try this and see if it helps :


#!/usr/bin/env jython
import testlib

print testlib.B
print testlib.B.C

| Otherwise I've been astounded how easy it is to use Jython and Java
| together, and we will probably start using it on a medium-big project
| at work.

Sounds good!  IMO Python (Jython) is much easier to use than Java.

-D

[Jython-users] Importing and using nested classes

[Michael H. <mh...@al...>]

Hello,

I'm new to Jython and to Java, so I might be trying things that are
just nonsense.  But I am having trouble importing and using
multiply-nested java classes using jython.  The following illustrates
the problem:

In testlib.java:

public class testlib {
    static public class B {
        static public class C {
            public C() {
                System.out.print("This must be working!\n");
            }
        }
    }
}


In test.java:
import testlib.B.C;

public class test {
    static public void main(String[] args) {
    }
}


In test.py:

#! /usr/bin/env jython

import testlib
import testlib.B
import testlib.B.C


Try to run it:

$ JIKESPATH=.:$JIKESPATH jikes testlib.java test.java
$ java test
This must be working!
$ jython test.py
Traceback (innermost last):
  File "test.py", line 5, in ?
ImportError: No module named C
$ 

I thought this should import the C class from jython, but it doesn't
seem to work.  Could the problem be that it is doubly-nested (i.e.,
the .class file has two '$' in it)?

Otherwise I've been astounded how easy it is to use Jython and Java
together, and we will probably start using it on a medium-big project
at work.

Thanks,
Michael

--
Michael Haggerty
mh...@al...

Re: [Jython-users] Problem with command module

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

The solution is a bit more complicated it seems. The following works well.


from java.io import *
from java.lang import *

proc = Runtime.getRuntime().exec("ls -la")
stdin = proc.getInputStream()
isr = InputStreamReader(stdin)
br=BufferedReader(isr)

line = br.readLine()
while line != None :
        print(line)
        line = br.readLine()


I got some help from this resource:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Comments?



On Tue, 10 Jul 2001, D-Man wrote:

> On Tue, Jul 10, 2001 at 03:44:54PM +0200, Kevin McNamee wrote:
> | OK, this works, but it just returns '0'. I guess this the return code from
> | the 'ls -al' command. Where is the actual output?
>
> Yep.  That means that the command completed successfully (at least
> that's the convention on *nix).
>
> See
> http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Process.html.
> java.lang.Runtime.exec returns a java.lang.Process object to you.
> That Process object has methods
>
>     getOutputStream()
>     getInputStream()
>     getErrorStream()
>     exitValue()
>
> You are looking to getOutputStream from the Process.  The waitFor
> method returns the exitValue.
>
> HTH,
> -D
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>

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

Re: [Jython-users] Problem with command module

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

On Tue, Jul 10, 2001 at 03:44:54PM +0200, Kevin McNamee wrote:
| OK, this works, but it just returns '0'. I guess this the return code from
| the 'ls -al' command. Where is the actual output?

Yep.  That means that the command completed successfully (at least
that's the convention on *nix).

See
http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Process.html.
java.lang.Runtime.exec returns a java.lang.Process object to you.
That Process object has methods

    getOutputStream()
    getInputStream()
    getErrorStream()
    exitValue()

You are looking to getOutputStream from the Process.  The waitFor
method returns the exitValue.

HTH,
-D

Re: [Jython-users] Problem with command module

[Glen S. <gl...@en...>]

On Tue, 10 Jul 2001, D-Man wrote:
> On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
> | On Tue, 10 Jul 2001, Kevin McNamee wrote:
> | > Is there no possibility to run arbitrary system commands without writing
> | > Java code?
> | 
> | 
> | In a nutshell, no... however, it is not Java code you will be
> | writing... it will be Jython :-)
> | 
> | For example:
> | 
> | from java.lang import *
> | Process p = Runtime.getRuntime().exec("ls -al")
>   ^^^^^^^
> 
> :-)  That is Java.  Jython doesn't use type declarations.

My bad... I guess since I am mixing Java classes and Python classes
together so much I tend to get confused from time to time.

 > 
> | p.waitFor()
> 
> -D
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
-- 
So what can we do? There is only one solution. Start killing. 
If you know someone who is excited about compileable ASP code... 
KILL THEM. If you know someone who has Visual Studio .NET beta... 
KILL THEIR WHOLE FAMILY. 

-- /. posting

Re: [Jython-users] Problem with command module

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

OK, this works, but it just returns '0'. I guess this the return code from
the 'ls -al' command. Where is the actual output?


On Tue, 10 Jul 2001, D-Man wrote:

> On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
> | On Tue, 10 Jul 2001, Kevin McNamee wrote:
> | > Is there no possibility to run arbitrary system commands without writing
> | > Java code?
> |
> |
> | In a nutshell, no... however, it is not Java code you will be
> | writing... it will be Jython :-)
> |
> | For example:
> |
> | from java.lang import *
> | Process p = Runtime.getRuntime().exec("ls -al")
>   ^^^^^^^
>
> :-)  That is Java.  Jython doesn't use type declarations.
>
> | p.waitFor()
>
> -D
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
>

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

Re: [Jython-users] Problem with command module

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

On Tue, Jul 10, 2001 at 06:20:27AM -0700, Glen Starchman wrote:
| On Tue, 10 Jul 2001, Kevin McNamee wrote:
| > Is there no possibility to run arbitrary system commands without writing
| > Java code?
| 
| 
| In a nutshell, no... however, it is not Java code you will be
| writing... it will be Jython :-)
| 
| For example:
| 
| from java.lang import *
| Process p = Runtime.getRuntime().exec("ls -al")
  ^^^^^^^

:-)  That is Java.  Jython doesn't use type declarations.

| p.waitFor()

-D

Re: [Jython-users] Problem with command module

[Glen S. <gl...@en...>]

On Tue, 10 Jul 2001, Kevin McNamee wrote:
> Is there no possibility to run arbitrary system commands without writing
> Java code?


In a nutshell, no... however, it is not Java code you will be
writing... it will be Jython :-)

For example:

from java.lang import *
Process p = Runtime.getRuntime().exec("ls -al")
p.waitFor()

Re: [Jython-users] Problem with command module

[Glen S. <gl...@en...>]

> 
> Where is the 'os' module located? (I can't find it in Lib)
> 
> /Kevin
[glen@daibutsu glen]$ jython
Jython 2.1a1 on java1.3.0_02 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import os
>>> dir(os)
['File', '__depends__', '__doc__', '__file__', '__name__', '_exit', 'classDictInit', 'curdir', 'defpath', 'environ', 'error', 'getcwd', 'java', 'javapath', 'linesep', 'listdir', 'makedirs', 'mkdir', 'name', 'pardir', 'path', 'pathsep', 'remove', 'rename', 'rmdir', 'sep', 'stat', 'unlink']
>>>


You'll notice that there is no popen defined in Jython's os module.
Your best bet is to approximate it in Java using Runtime and
Process, or remove that functionality from your code... ;-)

[Jython-users] Problem with command module

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

Hi,

Solaris 8
Jython 2.0 on java1.3.0_01 (JIT: null)


>>> import commands
>>> commands.getoutput ('ls')
Traceback (innermost last):
  File "<console>", line 1, in ?
  File "/opt/python/jpython/Lib/commands.py", line 42, in getoutput
  File "/opt/python/jpython/Lib/commands.py", line 51, in getstatusoutput
AttributeError: class 'org.python.modules.os' has no attribute 'popen'


What's wrong?

Where is the 'os' module located? (I can't find it in Lib)

/Kevin


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

Re: [Jython-users] [OT] loading resources

[Glen S. <gl...@en...>]

On Mon, 09 Jul 2001, Robert Kuzelj wrote:
> hi,
> 
> can anybody explain this strange behavior when
> loading a folder as a resource?
> 
> why can i load "/java/util" as a folder
> but cannot load "/org/jdom" ?
> 
> even after loading a class from "/org/jdom" i still cannot
> laod the directory.

I would venture to guess that it has something to do with
__init__.py. I may be completely wrong, but I would guess that
Jython creates a token __init__.py for the known Java libs
(anything under java.* or javax.*), but not for arbitrary packages,
such as org.jdom

Just a guess though...

> 
> 
> C:\data\develop\pyparser\src_python>jython
> Jython 2.1a1 on java1.3.0 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> >>> from java.lang import String
> >>>
> >>> res = String.getResource("/java/util")
> >>> print res
> jar:file:/C:/develop/java/jdk/jre/lib/rt.jar!/java/util
> >>>
> >>> res = String.getResource("/org/jdom")
> >>> print res
> None
> >>> res = String.getResource("/org/jdom/Element.class")
> >>> print res
> jar:file:/C:/develop/java/jdom/jdom.jar!/org/jdom/Element.class
> >>>
> >>> from org.jdom import Element
> >>>
> >>> res = String.getResource("/org/jdom")
> >>> print res
> None
> >>>
> 
> 
> any help is appreciated.
> 
> ciao robertj
> 
> =====
> itemj
> http://www.itemj.com
> Robert Kuzelj          
> Gaissacherstrasse 7
> 81371 Muenchen         
> tel 0177  5302230
> 
> __________________________________________________
> Do You Yahoo!?
> Get personalized email addresses from Yahoo! Mail
> http://personal.mail.yahoo.com/
> 
> _______________________________________________
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> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users
-- 
So what can we do? There is only one solution. Start killing. 
If you know someone who is excited about compileable ASP code... 
KILL THEM. If you know someone who has Visual Studio .NET beta... 
KILL THEIR WHOLE FAMILY. 

-- /. posting

[Jython-users] [OT] loading resources

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

hi,

can anybody explain this strange behavior when
loading a folder as a resource?

why can i load "/java/util" as a folder
but cannot load "/org/jdom" ?

even after loading a class from "/org/jdom" i still cannot
laod the directory.


C:\data\develop\pyparser\src_python>jython
Jython 2.1a1 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> from java.lang import String
>>>
>>> res = String.getResource("/java/util")
>>> print res
jar:file:/C:/develop/java/jdk/jre/lib/rt.jar!/java/util
>>>
>>> res = String.getResource("/org/jdom")
>>> print res
None
>>> res = String.getResource("/org/jdom/Element.class")
>>> print res
jar:file:/C:/develop/java/jdom/jdom.jar!/org/jdom/Element.class
>>>
>>> from org.jdom import Element
>>>
>>> res = String.getResource("/org/jdom")
>>> print res
None
>>>


any help is appreciated.

ciao robertj

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

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Re: [Jython-users] How can i use inner class in java to jython?

[<bc...@wo...>]

[syKim]

>Hello..
>
>I'm trying html editing tool..
>
>it's nessary handling view handling.
>
>show that code : 
>-----------------------------------------------------------------
>class TestEditorKit(HTMLEditorKit):
>   def getViewFactory(self):
>       return self.TestFactory()
>
>   class TestFactory(HTMLEditorKit.HTMLFactory):
>       def create(self,e):
>           o = e.getAttributes().getAttribute(StyleConstants.NameAttribute)
>           if o == HTML.Tag.INPUT:
>               return TestFormView(e)
>           return HTMLEditorKit.HTMLFactory.create(self,e)

That is a bug in jythonc where the base class is not recognized as a
java class. I just checked in a workaround.

regards,
finn

P.S.

Your mails happens to look like this in my mailprogram:

>DQoNCj5IYXZlbid0IGNvZGVkIHRoaXMsIGJ1dCB5b3UgcHJvYmFibHkgd2FudCB0byBqdXN0IHB1
>dCBUZXN0RmFjdG9yeSBhdCB0aGUgdG9wLWxldmVsIChyZW1vdmUgdGhlIG5lc3RpbmcpLg0KDQo+
>...

Is there anything you can do to avoid that?

RE: [Jython-users] How can i use inner class in java to jython?

[syKim <re...@ne...>]

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DQo+IC0tIHN5S2ltJythonusersmailiniAgIGKy0nK2

[Jython-users] How can i use inner class in java to jython?

[syKim <re...@ne...>]

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[Jython-users] pystone comparison - jython w/jdk 1.4beta vs cpython on win2k

[Amund T. <amu...@jf...>]

Hi.

I read the benchmark using jython together with java 1.4beta on Linux (ref:
"How good is Jython", Finn Bock, 20010526), and wondered how java 1.4 with
jython would perform on win2k, so I tested it. My test results of seems very
promising on win2k as well (about 29% faster than CPython) , see below for
my test results and test configuration.

Configuration:
IBM Thinkpad A20P, 700Mhz P-III, 256MB RAM with Windows 2000, Jython v2.1a1,
CPython 2.1 and JDK 1.4beta

I used 1000000 (10^6) iterations in Pystone in all tests, the tests were
only run once so they're not statistically significant, but otherwise they
are believed to be correct.

1. Results jython with java SERVER (java 1.4) virtual machine:
Command: java -server -Xmx200m -Dpython.home="c:/programs/jython-2.1a1"
org.python.util.jython pystone.py
Time: 97.279s
Benchmark: 10279.7 pystones/sec

2. Results jython with HOTSPOT (java 1.4) virtual machine:
Command: jython pystone.py (hotspot is default virtual machine)
Time: 149.265s
Benchmark: 6699.49 pystones/sec

3. Results cpython:
Command: python pystone.py
Time: 125.571s
Benchmark: 7952.22 pystones/sec

Remark:
When I tested with only 10000 (10^4) iterations, jython+java server got
about 1000 pystones/sec, jython+hotspot got about 4000 pystones/sec, and
cpython got about 8000 pystones/sec, so it seems that the java server
virtual is a "slow learner", but with highly specialized tuning of
performance over time (i.e. with more iterations).

If you have any specialized (e.g. Network/Disk IO) benchmarks and
performance comparisons regarding Jython, I would like to hear about it.

Amund
am...@jf... - http://www.jfipa.org/amund/