jython-users — Discussion of and questions about using Jython

Re: [Jython-users] Jython documentation

[John M. <joh...@ya...>]

Another resource:

http://www.fnal.gov/fermitools/abstracts/fermipython/abstract.html

Click on Documentation to download an excellent intro to Jython and
Swing programming.



--- Ben Hutchison <ben...@fi...> wrote:
> Sarwar Raza wrote:
> 
> >Would anyone be interested in collaborating on the
> >'Jython documentation project' - of course not on the
> >scale of the Linux or Python docs, but you get the
> >general idea. 
> >
> >thanks
> >-Sarwar
> >
> Yes I would.  
> 
> A starting point would be to host it somewhere. Maybe at jython.org 
> makes most sense, or we could create project in sourceforge without
> too 
> much trouble.Or do you prefer another project host?
> 
> Then, the next question is what to attempt, both style of
> documentation 
> and coverage?
> 
> In terms of content coverage, some ideas:
> 
> Fundamentals:
>     basic differences between Java and Python
>     jython types and their mapping to java, python
>     calling java from jython
>     calling python from jython
>     starting jython interpreter from java
>     calling java methods from jython
>     handling java exceptions in jython
>     discuss jython scripts as java classes
>     subclassing java classes in jython + Java reflection
>     special jython keywords -> javabeans properties mapping
>     String handling in jython vs Java
>     dir() in jython
>    
> Jython software and tools
>     using interactive interpreter
>     configuration properties
>     command line options for tools
>     layout & description of installed files
>     using jythonc
>     using python modules
>     using java debuggers
>     jython performance considerations
> 
> Resources
>     jython web site
>     Bruce Eckel  - thinking in patterns
>     python web site
>    
> 
> Thats a start.
> 
> Regards
> Ben
> 
> 
> >
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users


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Re: [Jython-users] Jython documentation

[Ben H. <ben...@fi...>]

Sarwar Raza wrote:

>Would anyone be interested in collaborating on the
>'Jython documentation project' - of course not on the
>scale of the Linux or Python docs, but you get the
>general idea. 
>
>thanks
>-Sarwar
>
Yes I would.  

A starting point would be to host it somewhere. Maybe at jython.org 
makes most sense, or we could create project in sourceforge without too 
much trouble.Or do you prefer another project host?

Then, the next question is what to attempt, both style of documentation 
and coverage?

In terms of content coverage, some ideas:

Fundamentals:
    basic differences between Java and Python
    jython types and their mapping to java, python
    calling java from jython
    calling python from jython
    starting jython interpreter from java
    calling java methods from jython
    handling java exceptions in jython
    discuss jython scripts as java classes
    subclassing java classes in jython + Java reflection
    special jython keywords -> javabeans properties mapping
    String handling in jython vs Java
    dir() in jython
   
Jython software and tools
    using interactive interpreter
    configuration properties
    command line options for tools
    layout & description of installed files
    using jythonc
    using python modules
    using java debuggers
    jython performance considerations

Resources
    jython web site
    Bruce Eckel  - thinking in patterns
    python web site
   

Thats a start.

Regards
Ben


>

Re: [Jython-users] Jython documentation

[Sarwar R. <raz...@ya...>]

Would anyone be interested in collaborating on the
'Jython documentation project' - of course not on the
scale of the Linux or Python docs, but you get the
general idea. 

thanks
-Sarwar



=====
*************************
Sarwar S Raza
NMS Software Engineer
CommWorks Corporation
http://www.wpi.edu/~sraza
*************************

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Re: [Jython-users] Jython documentation

[<Ron...@Ne...>]

There is a book coming out this fall about Java/Python/Web development.
   Saw it at Amazon; the blurb on it doesn't say much yet.  I have the page
  printed at home, so can't give anymore specifics.







Ben Hutchison <ben...@fi...>@lists.sourceforge.net on
05/24/2001 06:09:00 AM

Sent by:  jyt...@li...


To:   jyt...@li...
cc:

Subject:  Re: [Jython-users] Jython documentation

Joshua Fox wrote:

>I have enjoyed reading Eckels' work in Thinking in Patterns about Jython's
>capabilities in scripting Java apps.
>
>We have not found any other documentation about the Java-specific
>capabilities of Jython: Calling Java classses from Python, interpreting
>Python code in a Java app, compiling Python classes to *.class, etc.
>
>Is there any such documentation?
>
AFAIK, only the brief material on www.jython.org, and the archives of
this mailing list which holds alot of knowledge.

Ive often thought Jython needs a good document set, which could be
produced by organizing and distilling the mailing lists & web site. Id
like to try it myself but I dont think it will happen while I am working
full time.

Regards
Ben


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Jython-users mailing list
Jyt...@li...
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Re: [Jython-users] Re: [Jython-dev] Re: where to put the registry file on Win NT

[<Arm...@t-...>]

Hi Samuele,

thanks for your help. Indeed, the file name has to be '.jython' in the home
directory.

Regards

Armin

> Note: the personal file should be named .jython also under windows !
>
> I have tried this concretely under w9x (home ~ c:\windows)
> and w2k (home ~ see above) and it works.
>
> Things to check:
> * a registry (.jython) file should respect the hosting os conventions:
>   - Windows: path sep \\ or /, path list sep ;
>   - Un*x: path sep / , path list sep :
>
>   having a single \ (which is a continues-next-line marker)
>   around instead of a \\ seems to prevent proper parsing of the file
>   (symptom: sys.registry seems empty ({})), (we are using the java
>   api for that)
>
> * Test: copy registry from jython inst dir to your home dir as .jython and put a
> line like
>     a.Test = yup
> in it, load jython and check whether sys.registry contains a.Test=yup.
>
> Regards.

Re: [Jython-users] Jython documentation

[Ben H. <ben...@fi...>]

Joshua Fox wrote:

>I have enjoyed reading Eckels' work in Thinking in Patterns about Jython's
>capabilities in scripting Java apps.
>
>We have not found any other documentation about the Java-specific
>capabilities of Jython: Calling Java classses from Python, interpreting
>Python code in a Java app, compiling Python classes to *.class, etc.
>
>Is there any such documentation?
>
AFAIK, only the brief material on www.jython.org, and the archives of 
this mailing list which holds alot of knowledge.

Ive often thought Jython needs a good document set, which could be 
produced by organizing and distilling the mailing lists & web site. Id 
like to try it myself but I dont think it will happen while I am working 
full time.

Regards
Ben

[Jython-users] Jython documentation

[Joshua F. <jo...@jo...>]

I have enjoyed reading Eckels' work in Thinking in Patterns about Jython's
capabilities in scripting Java apps.

We have not found any other documentation about the Java-specific
capabilities of Jython: Calling Java classses from Python, interpreting
Python code in a Java app, compiling Python classes to *.class, etc.

Is there any such documentation?

Joshua

[Jython-users] Re: access to .py's in jars

[Harlan H. <ha...@ot...>]

> Date: Mon, 21 May 2001 18:50:33 -0400
> From: D-Man <ds...@ri...>
> 
> Could you share some of that python code?
> 
> The following code works fine for me:
> 
> ========== Foo.py ==============
> import java
> 
> class Foo( java.lang.Object ) :
>     def __init__( self ) :
>         """
>         @sig public Foo()
>         """
>         print "Foo.__init__"

OK, i've figured this one out.  I was importing java.math and
java.util.  for some reason that masks java.lang.Object.  When i dropped
my "import java.util" in favor of "import java", jythonc was able to let
me extend from java.lang.Object.
is this a bug in jythonc?

> ========== Bar.java ===========
> class Bar
> {
>     public static void main( String[] argv )
>     {
>         System.out.println( "main ..." ) ;
>         Foo obj = new Foo() ;
>         System.out.println( "end of main" ) ;
>     }
> }

I'm using factory methods, and several classes in one .py file, but 
the code is similar

public class session { 

    //is it necessary to load the module, and have it call initConstants?
    //that's what the following two lines do..
    private static pysession._PyInner mod = new pysession._PyInner();
    private static PyCode main = mod.getMain();

    public static Object createSession() {
        return new pysession.session(SessionFactory.createSession());
    }
    
    public static Object createSessionGroup() {
        return new pysession.sessiongroup(SessionFactory.createSessionGroup());
    }
}

----
ha...@ot...    x293

[Jython-users] Setting own system properties

[Waclawczyk J. <Jan...@ic...>]

Hello,

with the option -D I can set only jython system property, but I would like to set system property for my java sw, which is called from jython script.

Currently I'm using following workaround:
1. I changed the jython starting script
	/pool/java/SunOS/jdk1.1.8/bin/jre ... $JAVA_PROPERTIES ... org.python.util.jython "$@"
2. before running jython I set the env variable above
	tcsh>setenv JAVA_PROPERTIES "-Djan=hello"
	tcsh>jython

Are there more convincing ways?

Regards, Janusz Waclawczyk

Re: [Jython-users] Different result in interpreter and when compiled with Jythonc

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

Hi.

Seems that a lot of people ignore this but java -jar
does not use the classpath settings, the jar should be
self-contained. This is unrelated to jython <wink> 
(on the other hand - I think - extensions (in java sense) are considered)

http://java.sun.com/j2se/1.3/docs/tooldocs/linux/java.html#-jar

regards.

Re: [Jython-users] Re: [Jython-dev] Re: where to put the registry file on Win NT

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

Hi

[Armin Ehrenfels]
> Hi Samuele,
> 
> Samuele Pedroni schrieb:
> 
> > Under w2k one can put a personal .jython file (contents as the registry)
> > under Documents and Settings/*user-name* (or something like that)
> > in NT there should be something similar, just start jython
> > and ask:
> >
> > from java.lang import System
> > System.getProperty("user.home")
> >
> > in that directory you can put your .jython file and deduce the general
> > case <wink>
> 
> That was my first guess. So, I copied .jython from Linux to registry in
> C:\winnt\profiles\armin which is the value of user.home. Didn't work. It
> only works when the registry file is in Jython's installation directory.
> 
> Regards
Note: the personal file should be named .jython also under windows !

I have tried this concretely under w9x (home ~ c:\windows)
and w2k (home ~ see above) and it works.

Things to check:
* a registry (.jython) file should respect the hosting os conventions:
  - Windows: path sep \\ or /, path list sep ;
  - Un*x: path sep / , path list sep :
 
  having a single \ (which is a continues-next-line marker) 
  around instead of a \\ seems to prevent proper parsing of the file
  (symptom: sys.registry seems empty ({})), (we are using the java
  api for that)

* Test: copy registry from jython inst dir to your home dir as .jython and put a 
line like  
    a.Test = yup 
in it, load jython and check whether sys.registry contains a.Test=yup.

Regards.

Re: [Jython-users] Re: access to .py's in jars

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

On Mon, May 21, 2001 at 02:56:52PM -0700, Harlan Hile wrote:
| > Date: Fri, 18 May 2001 23:21:11 -0400
| > From: D-Man <ds...@ri...>
| > You only need the @sig stuff if you want to access the _classes_ in
| > the python module from a java class.  The limitation to classes only
| > (and not module-level stuff) is a result of java.
| 
| So, what i've ended up doing is writing a small bit of java for the module
| level stuff.. some constants and a few static methods.  i have methods
| that return the result of calling the constructors of the classes i have,
| which are written in python and then jythonc'd.  
| This seems to work pretty well, but I had to make the constructors of the
| classes accessible from java, which means i needed to make them inherit
| from a java class.  just having them inherit from Object didnt seem to
| work, so they inherit from the classes i'm trying to wrap, which isnt
| exactly what should happen, but it works OK.

Could you share some of that python code?

The following code works fine for me:

========== Foo.py ==============
import java

class Foo( java.lang.Object ) :
    def __init__( self ) :
        """
        @sig public Foo()
        """
        print "Foo.__init__"


========== Bar.java ===========
class Bar
{
    public static void main( String[] argv )
    {
        System.out.println( "main ..." ) ;
        Foo obj = new Foo() ;
        System.out.println( "end of main" ) ;
    }
}


====== shell (bash from cygwin on win2k) =======
$ jythonc Foo.py
<jythonc output>
$ javac2 -classpath .\;jpywork\;d:/apps/jython-2.0/jython.jar Bar.java
$ java2 -classpath .\;jpywork\;d:/apps/jython-2.0/jython.jar Bar
main ...
Foo.__init__
end of main
$


In this message you said that the java code must access the python
code.  In that case the @sig thing is needed.  As you can see in the
example, the @sig is rather simple -- it is placed in the method's
docstring and contains the java signature that jythonc should
generate.

-D

[Jython-users] Re: access to .py's in jars

[Harlan H. <ha...@ot...>]

> Date: Fri, 18 May 2001 23:21:11 -0400
> From: D-Man <ds...@ri...>
> You only need the @sig stuff if you want to access the _classes_ in
> the python module from a java class.  The limitation to classes only
> (and not module-level stuff) is a result of java.

So, what i've ended up doing is writing a small bit of java for the module
level stuff.. some constants and a few static methods.  i have methods
that return the result of calling the constructors of the classes i have,
which are written in python and then jythonc'd.  
This seems to work pretty well, but I had to make the constructors of the
classes accessible from java, which means i needed to make them inherit
from a java class.  just having them inherit from Object didnt seem to
work, so they inherit from the classes i'm trying to wrap, which isnt
exactly what should happen, but it works OK.


----
ha...@ot...    x293
http://65.0.250.62/

Re: [Jython-users] Different result in interpreter and when compiled with Jythonc

[Frode R. <fro...@er...>]

Hi again,

I try with a new example and below you can see the log. I am using
Jython2.1a1. If I remove the from ... Import then I get a "AtributeError
java package 'datarep.common' has no attribute 'Spacer'". If someone want to
try with the datarep_common.jar you can either download Simplicity or send
me a mail so I can send it off list.

============  Log start ============
c:\Document\PaaceTest>type test.py
type test.py
import java,javax,datarep.common

from datarep.common import Spacer

class testClass:
    def __init__(self):
        self.Spacer = datarep.common.Spacer(5,5)


t=testClass()
print t.Spacer
c:\Document\PaaceTest>jython test.py
jython test.py
datarep.common.Spacer[,0,0,5x5,invalid]
c:\Document\PaaceTest>java -jar test.jar -c test.py
java -jar test.jar -c test.py
Java Traceback:

    at org.python.core.Py.ImportError(Py.java:180)
    at org.python.core.imp.importFromAs(imp.java:593)
    at test$_PyInner.main$3(test.java:61)
    at test$_PyInner.call_function(test.java:38)
    at org.python.core.PyTableCode.call(PyTableCode.java:198)
    at org.python.core.PyCode.call(PyCode.java:13)
    at org.python.core.imp.createFromCode(imp.java:165)
    at org.python.core.Py.runMain(Py.java:818)
    at test.main(test.java:80)
Traceback (innermost last):
  File "C:\Document\PaaceTest\test.py", line 0, in main
ImportError: cannot import name Spacer

c:\Document\PaaceTest>jythonc -jar test.jar -c test.py
jythonc -jar test.jar -c test.py
Warning: -jar is deprecated, use --jar
processing test

Required packages:
  javax
  java
  datarep.common

Creating adapters:

Creating .java files:
  test module

Compiling .java to .class...
Compiling with args: ['c:\\tools\\jdk130\\bin\\javac', '-classpath',
'"C:\\tools\\Jython\\Jython21a1\\jython.jar;.;C:\\tools\\SimplicityProfessio
nal\\pbclient31RE.jar;C:\\tools\\SimplicityProfessional\\pbnetwork31RE.jar;C
:\\tools\\SimplicityProfessional\\datarep_common.jar;.\\jpywork;;C:\\tools\\
Jython\\Jython21a1\\Tools\\jythonc;c:\\Document\\PaaceTest\\.;C:\\tools\\Jyt
hon\\Jython21a1\\Lib;C:\\tools\\Jython\\Jython21a1"',
'.\\jpywork\\test.java']
0  Note: Some input files use or override a deprecated API.
Note: Recompile with -deprecation for details.

Building archive: test.jar
Tracking java dependencies:
c:\Document\PaaceTest>java -jar test.jar test
java -jar test.jar test
Java Traceback:

    at org.python.core.Py.ImportError(Py.java:180)
    at org.python.core.imp.importFromAs(imp.java:593)
    at test$_PyInner.main$3(test.java:57)
    at test$_PyInner.call_function(test.java:36)
    at org.python.core.PyTableCode.call(PyTableCode.java:198)
    at org.python.core.PyCode.call(PyCode.java:13)
    at org.python.core.imp.createFromCode(imp.java:165)
    at org.python.core.Py.runMain(Py.java:818)
    at test.main(test.java:74)
Traceback (innermost last):
  File "C:\Document\PaaceTest\test.py", line 0, in main
ImportError: cannot import name Spacer

c:\Document\PaaceTest>jar -tf
c:\tools\SimplicityProfessional\datarep_common.jar
jar -tf c:\tools\SimplicityProfessional\datarep_common.jar
META-INF/MANIFEST.MF
datarep/
datarep/common/
datarep/common/AbsoluteLayout.class
datarep/common/ApplicationAudioClip.class
datarep/common/BottomLayout.class
datarep/common/Calculator.class
datarep/common/Calculator$Lexer.class
datarep/common/Calculator$Cpu.class
datarep/common/CalculatorTest.class
datarep/common/CloseListener.class
datarep/common/Email.class
datarep/common/Flyer.class
datarep/common/FlyoutHelpManager.class
datarep/common/FrameAnimator.class
datarep/common/GBConstraints.class
datarep/common/GroupBoxPanel.class
datarep/common/HeavyGroupBoxPanel.class
datarep/common/Helpable.class
datarep/common/HelpTest.class
datarep/common/ImageButton.class
datarep/common/ImageCanvas.class
datarep/common/ImageHandler.class
datarep/common/JarUtil.class
datarep/common/LeftSideLayout.class
datarep/common/MessageBox.class
datarep/common/ProgressBar.class
datarep/common/Sizer.class
datarep/common/Spacer.class
datarep/common/TabbedCardPanel.class
datarep/common/TemplateProcessor.class
datarep/common/TemplateProcessor$Node.class
datarep/common/TextPrinter.class
datarep/common/Util.class
datarep/common/ValidatedTextField.class
datarep/common/WrapLabel.class
datarep/common/database/
datarep/common/database/QueryTableModel.class
datarep/common/database/QueryListModel.class
datarep/common/database/QueryComboBoxModel.class
datarep/common/database/ColumnMapping.class
datarep/common/database/InputMapping.class
datarep/common/database/ActionMapping.class
datarep/common/database/SelectionMapping.class
datarep/common/database/Mapping.class
datarep/common/database/Query.class
datarep/common/database/QueryList.class
datarep/common/database/Command.class
datarep/common/database/DatabaseManager.class
datarep/common/database/DatabaseManager$SelectionCommandListener.class
datarep/common/database/DatabaseManager$ActionCommandListener.class

c:\Document\PaaceTest>echo %classpath%
echo %classpath%
.;C:\tools\SimplicityProfessional\pbclient31RE.jar;C:\tools\SimplicityProfes
sional\pbnetwork31RE.jar;C:\tools\SimplicityProfessional\datarep_common.jar

c:\Document\PaaceTest>

============  Log end ============


> Hi.
> 
> [Frode Reinsnes]
>> I have used Jython for a while, but I haven't use Jythonc before. So I think
>> I have miss something, but are not able to se what.
:
: First example removed because Samuele Pedroni explain it.
:
>> I am running on Windows 2000 with Sun's JDK 1.3.0. Have I miss some thing?
>> 
>> I wrote this test file because I have develop a application and used the
>> interpreter in the debugging phase. Then I want to compile it before I send
>> it to external test. But when I compile it with Jythonc and try to run it
>> complain about a class in a java library don't exist.
> 
> The std jython interpreter at initialitation time (for jars and dirs)
> and at runtime (for dirs) gathers info about java packages and the their
> classes (the info about jars is also cached), so a 'dir' correctly reports
> all classes in a package.
> 
> The runtime when running jythonc compiled code does not gather such info
> (so to be on the safe side for the applet case), on the other hand
> the runtime needs to know java packages names to deals with imports properly:
> jythonc tries to gather the names of used packages when compiling the program
> (through a minimal form of partial evaluation) and store them in the produced
> classes but without the complete list of the classes in a package (this is not
> really needed and could be slightly different at execution time), so the
> empty 'dir' results (only actually imported classes will appear there).
> 
> About the class not found problem:
> - a missing 'import' hint
> - the program was compiled under a classpath that does not contain
> all the classes needed at runtime, so jythonc fails to guess that something
> is actually a java package
> (yes, roughly jythonc should be executed with a classpath that offers all the
> classes that the program will need at runtime)
> - a problem with classloaders (these are hard to debug and one
> should knows what comes from where)
> ... and other possibilities that I don't remember .
> 
> regards, Samuele Pedroni.
> 

Re: [Jython-users] Different result in interpreter and when compiled with Jythonc

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

Hi.

[Frode Reinsnes]
> I have used Jython for a while, but I haven't use Jythonc before. So I think
> I have miss something, but are not able to se what.
> 
> I have this simple python file named test.py:
> 
> import java.lang
> print 'java.lang:',dir(java.lang)
> 
> If I compile it with Jythonc I don't get expected result
> 
> c:\Document\Test>jythonc --jar test.jar -c test.py
> :
> c:\Document\Test>java -jar test.jar test
> java -jar test.jar test
> java.lang: ['__name__']
> 
> 
> But if I use the interpreter I get the expected result.
> 
> c:\Document\Test>jython test.py
> jython test.py
> java.lang: ['AbstractMethodError', 'ArithmeticException',
> 'ArrayIndexOutOfBoundsException', 'ArrayStoreException', 'Boolean', 'Byte',
> 'Character', 'Class', 'ClassCastException', 'ClassCircularityError',
> 'ClassFormatError', 'ClassLoader', 'ClassNotFoundException',
> 'CloneNotSupportedException', 'Cloneable', 'Comparable', 'Compiler',
> 'Double', 'Error', 'Exception', 'ExceptionInInitializerError', 'Float',
> 'IllegalAccessError', 'IllegalAccessException', 'IllegalArgumentException',
> 'IllegalMonitorStateException', 'IllegalStateException',
> 'IllegalThreadStateException', 'IncompatibleClassChangeError',
> 'IndexOutOfBoundsException', 'InheritableThreadLocal', 'InstantiationError',
> 'InstantiationException', 'Integer', 'InternalError',
> 'InterruptedException', 'LinkageError', 'Long', 'Math',
> 'NegativeArraySizeException', 'NoClassDefFoundError', 'NoSuchFieldError',
> 'NoSuchFieldException', 'NoSuchMethodError', 'NoSuchMethodException',
> 'NullPointerException', 'Number', 'NumberFormatException', 'Object',
> 'OutOfMemoryError', 'Package', 'Process', 'Runnable', 'Runtime',
> 'RuntimeException', 'RuntimePermission', 'SecurityException',
> 'SecurityManager', 'Short', 'StackOverflowError', 'StrictMath', 'String',
> 'StringBuffer', 'StringIndexOutOfBoundsException', 'System', 'Thread',
> 'ThreadDeath', 'ThreadGroup', 'ThreadLocal', 'Throwable', 'UnknownError',
> 'UnsatisfiedLinkError', 'UnsupportedClassVersionError',
> 'UnsupportedOperationException', 'VerifyError', 'VirtualMachineError',
> 'Void', '__name__', 'ref', 'reflect']
> c:\Document\Test>
> 
> I am running on Windows 2000 with Sun's JDK 1.3.0. Have I miss some thing?
> 
> I wrote this test file because I have develop a application and used the
> interpreter in the debugging phase. Then I want to compile it before I send
> it to external test. But when I compile it with Jythonc and try to run it
> complain about a class in a java library don't exist.

The std jython interpreter at initialitation time (for jars and dirs)
and at runtime (for dirs) gathers info about java packages and the their
classes (the info about jars is also cached), so a 'dir' correctly reports
all classes in a package.

The runtime when running jythonc compiled code does not gather such info
(so to be on the safe side for the applet case), on the other hand
the runtime needs to know java packages names to deals with imports properly:
jythonc tries to gather the names of used packages when compiling the program
(through a minimal form of partial evaluation) and store them in the produced
classes but without the complete list of the classes in a package (this is not
really needed and could be slightly different at execution time), so the
empty 'dir' results (only actually imported classes will appear there).

About the class not found problem:
- a missing 'import' hint
- the program was compiled under a classpath that does not contain
 all the classes needed at runtime, so jythonc fails to guess that something
 is actually a java package
 (yes, roughly jythonc should be executed with a classpath that offers all the 
classes that the program will need at runtime)
- a problem with classloaders (these are hard to debug and one
should knows what comes from where)
... and other possibilities that I don't remember .

regards, Samuele Pedroni.

Re: [Jython-users] "from A import *" Q

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

Hi.

[Robert W. Bill]
> Hello,
> 
> I'm curious about the underscore import restriction- e.g, 
> >>> from A import * 
> when objects within "A" begin with a single underscore.
> 
> CPython excludes those objects prefixed with a single underscore,
> while Jython excludes those with 2 prefixing underscores only.
> I didn't see anything on "differences.html," in the bug-list, in
> mail archives, nor code comment that indicates this is
> intended.  Sorry if I've overlooked the obvious, but I
> was hoping someone could tell me if this is expected behavior,
> or if it could change anytime soon.
Thanks for reporting this, it's a bug and there's is another bug
related to the fact that the restriction is in-place even when
__all__ is set.

regards, Samuele Pedroni.

[Jython-users] Different result in interpreter and when compiled with Jythonc

[Frode R. <fro...@er...>]

I have used Jython for a while, but I haven't use Jythonc before. So I think
I have miss something, but are not able to se what.

I have this simple python file named test.py:

import java.lang
print 'java.lang:',dir(java.lang)

If I compile it with Jythonc I don't get expected result

c:\Document\Test>jythonc --jar test.jar -c test.py
:
c:\Document\Test>java -jar test.jar test
java -jar test.jar test
java.lang: ['__name__']


But if I use the interpreter I get the expected result.

c:\Document\Test>jython test.py
jython test.py
java.lang: ['AbstractMethodError', 'ArithmeticException',
'ArrayIndexOutOfBoundsException', 'ArrayStoreException', 'Boolean', 'Byte',
'Character', 'Class', 'ClassCastException', 'ClassCircularityError',
'ClassFormatError', 'ClassLoader', 'ClassNotFoundException',
'CloneNotSupportedException', 'Cloneable', 'Comparable', 'Compiler',
'Double', 'Error', 'Exception', 'ExceptionInInitializerError', 'Float',
'IllegalAccessError', 'IllegalAccessException', 'IllegalArgumentException',
'IllegalMonitorStateException', 'IllegalStateException',
'IllegalThreadStateException', 'IncompatibleClassChangeError',
'IndexOutOfBoundsException', 'InheritableThreadLocal', 'InstantiationError',
'InstantiationException', 'Integer', 'InternalError',
'InterruptedException', 'LinkageError', 'Long', 'Math',
'NegativeArraySizeException', 'NoClassDefFoundError', 'NoSuchFieldError',
'NoSuchFieldException', 'NoSuchMethodError', 'NoSuchMethodException',
'NullPointerException', 'Number', 'NumberFormatException', 'Object',
'OutOfMemoryError', 'Package', 'Process', 'Runnable', 'Runtime',
'RuntimeException', 'RuntimePermission', 'SecurityException',
'SecurityManager', 'Short', 'StackOverflowError', 'StrictMath', 'String',
'StringBuffer', 'StringIndexOutOfBoundsException', 'System', 'Thread',
'ThreadDeath', 'ThreadGroup', 'ThreadLocal', 'Throwable', 'UnknownError',
'UnsatisfiedLinkError', 'UnsupportedClassVersionError',
'UnsupportedOperationException', 'VerifyError', 'VirtualMachineError',
'Void', '__name__', 'ref', 'reflect']
c:\Document\Test>

I am running on Windows 2000 with Sun's JDK 1.3.0. Have I miss some thing?

I wrote this test file because I have develop a application and used the
interpreter in the debugging phase. Then I want to compile it before I send
it to external test. But when I compile it with Jythonc and try to run it
complain about a class in a java library don't exist.

-- 
/Frode Reinsnes

[Jython-users] RE: Jython-users -- confirmation of subscription -- request 820700

[Even S. <so...@st...>]

-----Original Message-----
From: jyt...@li...
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jyt...@li...
Sent: 21. mai 2001 21:07
To: so...@st...
Subject: Jython-users -- confirmation of subscription -- request 820700


Jython-users -- confirmation of subscription -- request 820700

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- maintain the subject line as is (the reply's additional "Re:" is
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If you do not wish to subscribe to this list, please simply disregard
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Re: [Jython-users] string.atol('564645646465465L') failed

[Jerome B. <jer...@xr...>]

Thanks, I will do as you say.
I keep the problem of long('564645646465465L')
with Python 1.5.2 and Jython 1.1,
so I will upgrade.

Jerome

D-Man wrote:
> 
> On Mon, May 21, 2001 at 02:09:41PM +0200, Jerome Bouat wrote:
> | > I attempt to make the string.atol('564645646465465L')
> | > conversion but I obtained this error trace with JPython 2.0 :
> | >
> | > merveilles{27} jpython1.1
> | > JPython 1.1 on java1.2.2 (JIT: sunwjit)
> |
> | Sorry, error trace with JPython 1.1 of course.
> |
> | Does this 'atol' problem has been fixed with JPython 2.0 ?
> 
> Actually, IIRC, string.atol and string.atoi are deprecated.  Instead
> use the builtin functions "long" and "int", respectively.
> 
> (unfortunately Jython doesn't have doc strings in all of the standard
> stuff)
> 
> Python 2.1 (#1, Apr 17 2001, 09:45:01)
> [GCC 2.95.3-2 (cygwin special)] on cygwin_nt-4.01
> Type "copyright", "credits" or "license" for more information.
> >>> print long.__doc__
> long(x) -> long integer
> long(x, base) -> long integer
> 
> Convert a string or number to a long integer, if possible.  A floating
> point argument will be truncated towards zero (this does not include a
> string representation of a floating point number!)  When converting a
> string, use the given base.  It is an error to supply a base when
> converting a non-string.
> >>> print int.__doc__
> int(x[, base]) -> integer
> 
> Convert a string or number to an integer, if possible.  A floating point
> argument will be truncated towards zero (this does not include a string
> representation of a floating point number!)  When converting a string, use
> the optional base.  It is an error to supply a base when converting a
> non-string.
> >>>
> 
> Jython 2.0 on java1.3.0 (JIT: null)
> Type "copyright", "credits" or "license" for more information.
> >>> print long.__doc__
> None
> >>> print int.__doc__
> None
> >>> long( "564645646465465L" )
> 564645646465465L
> >>>
> 
> -D
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> http://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] string.atol('564645646465465L') failed

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

On Mon, May 21, 2001 at 05:37:17PM +0200, Jerome Bouat wrote:
| Thanks, I will do as you say.
| I keep the problem of long('564645646465465L')
| with Python 1.5.2 and Jython 1.1,
| so I will upgrade.

Yes, I think that change was introduced in 2.0.  (CPython and Jython)

-D

Re: [Jython-users] string.atol('564645646465465L') failed

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

On Mon, May 21, 2001 at 02:09:41PM +0200, Jerome Bouat wrote:
| > I attempt to make the string.atol('564645646465465L')
| > conversion but I obtained this error trace with JPython 2.0 :
| > 
| > merveilles{27} jpython1.1
| > JPython 1.1 on java1.2.2 (JIT: sunwjit)
| 
| Sorry, error trace with JPython 1.1 of course.
| 
| Does this 'atol' problem has been fixed with JPython 2.0 ?

Actually, IIRC, string.atol and string.atoi are deprecated.  Instead
use the builtin functions "long" and "int", respectively.

(unfortunately Jython doesn't have doc strings in all of the standard
stuff)

Python 2.1 (#1, Apr 17 2001, 09:45:01)
[GCC 2.95.3-2 (cygwin special)] on cygwin_nt-4.01
Type "copyright", "credits" or "license" for more information.
>>> print long.__doc__
long(x) -> long integer
long(x, base) -> long integer

Convert a string or number to a long integer, if possible.  A floating
point argument will be truncated towards zero (this does not include a
string representation of a floating point number!)  When converting a
string, use the given base.  It is an error to supply a base when
converting a non-string.
>>> print int.__doc__
int(x[, base]) -> integer

Convert a string or number to an integer, if possible.  A floating point
argument will be truncated towards zero (this does not include a string
representation of a floating point number!)  When converting a string, use
the optional base.  It is an error to supply a base when converting a
non-string.
>>>


Jython 2.0 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> print long.__doc__
None
>>> print int.__doc__
None
>>> long( "564645646465465L" )
564645646465465L
>>>


-D

Re: [Jython-users] string.atol('564645646465465L') failed

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

> > I attempt to make the string.atol('564645646465465L')
> > conversion but I obtained this error trace with JPython 2.0 :
> > 
> > merveilles{27} jpython1.1
> > JPython 1.1 on java1.2.2 (JIT: sunwjit)
> 
> Sorry, error trace with JPython 1.1 of course.
> 
> Does this 'atol' problem has been fixed with JPython 2.0 ?
> 
Yes, it is fixed in Jython 2.0.

regards, Samuele Pedroni.

Re: [Jython-users] string.atol('564645646465465L') failed

[Jerome B. <jer...@xr...>]

> I attempt to make the string.atol('564645646465465L')
> conversion but I obtained this error trace with JPython 2.0 :
> 
> merveilles{27} jpython1.1
> JPython 1.1 on java1.2.2 (JIT: sunwjit)

Sorry, error trace with JPython 1.1 of course.

Does this 'atol' problem has been fixed with JPython 2.0 ?

Thanks,
Jerome

Re: [Jython-users] string.atol('564645646465465L') failed

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

Hi.

> Hello,
> 
> I attempt to make the string.atol('564645646465465L')
> conversion but I obtained this error trace with JPython 2.0 :
you mean JPython 1.1

> 
> merveilles{27} jpython1.1
> JPython 1.1 on java1.2.2 (JIT: sunwjit)
> Copyright (C) 1997-1999 Corporation for National Research Initiatives
> >>> import string
> >>> string.atol('564645646465465L')
> Traceback (innermost last):
>   File "<console>", line 1, in ?
>   File "/opt/Misc/src/Python-1.5.2/Lib/string.py", line 417, in atol
> ValueError: non-integer argument to string.atol
> >>> ^D
> 
> 
> I wonder if this problem
> is fixed in the JPython 2.0
> as it seems to be in the Python 2.0
> (is an update usefull) :
> 
of course, you mean Jython 2.0:

Jython 2.0 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import string
>>> string.atol('564645646465465L')
564645646465465L
>>> 

In any case, an update is useful, it seems you have been lucky
until now <wink>, but Jython 2.0 fixes also more "serious" things.

regards, Samuele Pedroni.

Re: [Jython-users] modifying __bases__

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

Hi.

> I wrote some Python code that facilitates dynamic class extension at
> runtime for external and internal method invocations. As part of that, it
> modifies the __bases__ attribute on classes. Under CPython, this works
> fine. Jython, though, explicitly does not allow __bases__ to be modified.
> Just for kicks, I modifed the PyClass.java file to go ahead and allow the
> modification, and it seems to be happy enough. But I assume there was a
> reason for not allowing the assignment, and am wondering if there's some
> particularly nasty Jython scenario lurking out there waiting for me to
> tickle it? Any insight would be appreciated.
> 
The latest CVS version, also supports this kind of dynamic change.
On the other hand it supports it the naive way. 
The particularly nasty Jython scenario is trying to push the limit
playing with java base classes (removing, or substituting ...) 

regards, Samuele Pedroni.