Re: [Jython-users] Why is self used so much

[Doug Landauer <landauer@go...>]

>... wondering why it seems that every variable used has to
>have self prefixed to it.

Global and local variables do not require the "self." prefix;
it is only members -- aka instance variables -- and methods
that require this.

>I'd just like to know why this is needed or if im doing something wrong.

Or both!  (Your error is not capitalizing the "I" and omitting
the apostrophe.  Mine is in pointing that out.  You're welcome...)


See http://www.python.org/doc/Humor.html#zen ... the second item says

   Explicit is better than implicit.

That's the guiding principle for why this part of the language
was designed this way.

   channeling-the-Tim-bot-channeling-Guido-ly,
     -- Doug

Re: [Jython-users] bsddb module

[Stephen Naicken <stephenn@co...>]

Slightly off topic from jython, but does the berekely db java interface
support version 1.85 if conifgured with the 1.85 compatablity?

On Thu, 21 Feb 2002, Jeff Emanuel wrote:

> 
> 
> You can find a Java interface to Berkeley DB which you can access
> directly from jython.  Feed this to google  "berkeley db java"
> 
> 
> Stephen Naicken wrote:
> 
> > I have an application in python that requires the use of the bsddb
> > module to extract information from the mozilla 0.92 cache database,
> > cache.db.  I would like to port this application to jython, but the
> > bsddb module is not available.  What alternatives do i have?
> > 
> > Thanks 
> > 
> > Stephen
> > 
> > 
> > _______________________________________________
> > Jython-users mailing list
> > Jython-users@...
> > https://lists.sourceforge.net/lists/listinfo/jython-users
> > 
> 
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jython-users@...
> https://lists.sourceforge.net/lists/listinfo/jython-users
> 

Re: [Jython-users] OSError: [Errno 0] chdir not supported in Java?

[Mats Wichmann <mats@la...>]

 >What I'd suggest is some sort of collection of "porting stories"
 >(Python to Jython) and/or issues to expect when doing this kind
 >of thing. I'm not sure the FAQ is the best place for that, but
 >maybe I'm wrong.

I think a "porting FAQ", whether integrated with the main
FAQ or not, is always a good idea.  It provides a way to
capture particular issues that maybe don't belong in the
main docs, but still can save folks some time if documented
somewhhere.

[Jython-users] import jar, classes not seen by jython

[Sells, Fred <fred@ad...>]

I have a .jar build with jdk 1.3

I'm running jython21 installed under jdk1.4.

when I try to import my jar, I can see the jar and a dir of the imported
package shows all the classes.

But I cannot instantiate or otherwise reference the package.  

This problem is familiar, but I've searched for it without luck.  

Could I get a little help please

RE: [Jython-users] Why is self used so much

[O'Brien-Strain, Eamonn <eob@ex...>]

[Jython-users] Trouble with getting to EJB

[Mike Hostetler <thehaas@bi...>]

Hello,

I'm trying to use Jython to get to some EJB objects via JBoss 2.2 and
having very little luck.  I can get to the database from another
application (that also uses the EJB, but is Java) so I know that it is
being deployed properly.

According to the JBoss startup, my database is being deploy thus:
		  [jdbc/WP30] Starting
		  [jdbc/WP30] XA Connection pool jdbc/WP30 bound to java:/jdbc/WP30
		  [jdbc/WP30] Started

But when I try to get at it via zxODBC, it doesn't work:
		  >>> from com.ziclix.python.sql import zxJDBC
		  >>> jndi = "jdbc/WP30"
		  >>> db = zxJDBC.lookup(jndi)
		  Traceback (innermost last):
			 File "<console>", line 1, in ?
		  DatabaseError: jdbc not bound 

And there is a jndi.properties file in that directory, and Jython is
reading it.  I know this because if I muck with it, it give me an error:
 
original jndi.properties:
		  java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
		  java.naming.provider.url=localhost
		  java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

messed-up jndi.properties:
		  java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
		  java.naming.provider.url=fred://localhost
		  java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces

Run with bad jndi.properties:
		  >>> from com.ziclix.python.sql import zxJDBC
		  >>> jndi = "jdbc/WP30"
		  >>> db = zxJDBC.lookup(jndi)
		  Traceback (innermost last):
			 File "<console>", line 1, in ?
		  DatabaseError: fred

Now, I am totally lost.  What could the problem be?  Is there any
suggestions?

-- mikeh

-- 

Re: [Jython-users] code in emails

[<doug@fi...>]

Folks,

Please try to avoid using 3 consecutive X's in any code samples as some
email monitoring software views this as adult content and flags the email
for system administrator review.   The code below in which I replaced two
X's with periods was the culprit on our system.


Properties are diffrent. X..
>     sys.argv[0]
>     loading of python classes.


Thanks.


Doug

Re: [Zope] Re: [Jython-users] Jython and Zope

[Jeff Martin <jeff@mk...>]

If you look at the documentation
http://java.sun.com/j2se/1.3/docs/api/java/io/Serializable.html it
details this. Basically java uses two private methods.

private void writeObject(java.io.ObjectOutputStream out)
     throws IOException

and

private void readObject(java.io.ObjectInputStream in)
     throws IOException, ClassNotFoundException;
 
to handle serialization. You can implement you own versions of these
methods on an object so that the jvm uses these to serialize/deserialize
the object. This mean that when you do

o = new ObjectOutputStream(new FileOutputStream(filename));
o.writeObject(myClass);

java uses your o.writeObject to write the object to disk. You can then
use any format you wish to describe the object. If you represent you
object as a byte array you should be able to read this array into pyhon
and populate a python object using this data.

 
On Wed, 2002-02-27 at 21:47, Nicolas Bill Russell wrote:
> 
>  Really? Could you please explain in detail. :)
> o = new ObjectOutputStream(new FileOutputStream(filename));
> o.writeObject(myClass); (?)
> Isn't the syntax of Python classes different from Java?
> Thanks,
> Bill Nicolas
>   Jeff Martin <jeff@...> wrote: You could try implementing the readObject and writeObject methods on
> your java object. This would allow you to control the format into which
> they are serialized so you can interpret in in python.
> 
> 
> On Tue, 2002-02-26 at 21:31, Nicolas Bill Russell wrote:
> > 
> > The reason why I want to use Jython is that I need to access serialized Java objects.
> > I've designed a system that uses objects as the main storage media rather than databases. I used Java for the frontend of my system (Swing GUIs and object serialization) and is planning to use Python (Jython) for client-side processing of Java objects.
> > Is there any other (simpler) way to access Java objects using Python?
> > Thanks,
> > Bill Russell Gagalac-Nicolas
> > 
> > 
> > 
> > ---------------------------------
> > Do You Yahoo!?
> > Get personalised at My Yahoo!.
> -- 
> 
> 
> 
> ---------------------------------
> Do You Yahoo!?
> Get personalised at My Yahoo!.
-- 

RE: [Jython-users] Example of Java class reloading

[Gustav Bostrom <Gustav.Bostrom@eo...>]

Hi! I'm still not getting this to work. Now I get another error-message:

Traceback (innermost last):   File "<console>", line 1, in ?   File =
"v:\eonworx_testbed\gubos\src\python\python-geAamB", line 14, in =
runHello java.lang.IllegalAccessException
 	at java.lang.reflect.Constructor.newInstance(Native Method)
 	at =
org.python.core.PyReflectedConstructor.__call__(PyReflectedConstructor.ja=
va)
 	at org.python.core.PyJavaInstance.__init__(PyJavaInstance.java)
 	at org.python.core.PyJavaClass.__call__(PyJavaClass.java)
 	at org.python.core.PyObject.__call__(PyObject.java)
 	at =
org.python.pycode._pyx2.runHello$2(v:\eonworx_testbed\gubos\src\python\py=
thon-geAamB:14)
 	at =
org.python.pycode._pyx2.call_function(v:\eonworx_testbed\gubos\src\python=
\python-geAamB)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyFunction.__call__(PyFunction.java)
 	at org.python.pycode._pyx3.f$0(<console>:1)
 	at org.python.pycode._pyx3.call_function(<console>)
 	at org.python.core.PyTableCode.call(PyTableCode.java)
 	at org.python.core.PyCode.call(PyCode.java)
 	at org.python.core.Py.runCode(Py.java)
 	at org.python.core.Py.exec(Py.java)
 	at org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
 	at =
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.jav=
a)
 	at =
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.j=
ava)
 	at =
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.j=
ava)
 	at org.python.util.InteractiveConsole.push(InteractiveConsole.java)
 	at =
org.python.util.InteractiveConsole.interact(InteractiveConsole.java)
 	at org.python.util.jython.main(jython.java)
  java.lang.IllegalAccessException: java.lang.IllegalAccessException

What could be causing this?
My classpath does not contain the Hello class (I checked with :
>>> for path in System.getProperty("java.class.path").split(";"):
...	print path)

I've been getting this error when I try to use sys.add_extdir too. I =
never seem to get this dynamic loading of Java-classes to work. I must =
be doing something very wrong.

/Gustav



-----Original Message-----
From: Samuele Pedroni [mailto:pedroni@...]
Sent: Wednesday, February 27, 2002 6:15 PM
To: Gustav Bostrom; Jython (E-mail)
Subject: Re: [Jython-users] Example of Java class reloading


Example of Java class reloadingHi

From: Gustav Bostrom

>Hi!
>I'm struggling to get the Java-class reloading to work.
>I'm not very succesful.
>Does anyone have a good example to share?
>I tried this, but it didn't work:
>import jreload
>classpath=3D["V:\\eonworx\\output\\contrib\\studio\\classes"]
>classesLoadSet=3Djreload.makeLoadSet("classes",classpath)
>print classesLoadSet
>from classes import Hello
>jreload.reload(classesLoadSet)

you don't need this jreload.reload call

>def rl():
>    jreload.reload(classesLoadSet)
>def runHello():
>   Hello().sayHello()
>
> When I run rl() the Hello-class is still not reloaded and runHello() =
still
produces the old result.

Assuming that you have changed the class before calling rl() <wink>, the =
code
seems correct.

The Jython Demo/jreload directory contains the artifacts to run the =
interactive
session example
in Doc/jreload.html documentation.

Up to bugs, the only important thing to remember is that the LoadSet =
path
should
be disjunct from classpath and sys.path otherwise reloading will not =
work
(Java limitation).

regards, Samuele Pedroni.

[Jython-users] ¿ì~~¿Í??!! [È«º¸]

[¿ì~~¿Í??!! <touch114@dr...>]

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Re: [Jython-users] How to use the execute() method in javaos

[Oti <ohumbel@ya...>]

[ Hugh Rodgers ]

> I have been trying to use the javaos.execute() method for
> some time now, unsuccessfully. I basically wanted to do the
> following:
> 
>         import os
>         os.execute( "f:\tests\HelloWorld" )
> 
> where HelloWorld is my compiled and working Java
> application.

Hello Hugh,

please try:
  import os
  os.system( "f:\tests\HelloWorld" )

I believe the execute() method is internal to javaos.py

Best wishes,
Oti.


__________________________________________________
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Re: [Jython-users] freezing an application with pythonc? Do Python packages work?

[Samuele Pedroni <pedroni@in...>]

You have encountered a bug,
a workaround is to define
a startup.py:

import TopLevel.mainmodule

and then jythonc --core --deep --jar whatever.jar startup.py

but depending our needs this can be useful or  not.

Let us know.

regards, Samuele Pedroni.


----- Original Message -----
From: Bill Janssen <bill@...>
To: <jython-users@...>
Sent: Thursday, February 28, 2002 4:17 AM
Subject: [Jython-users] freezing an application with pythonc? Do Python
packages work?


> I've got a fairly large Python application working with Jython, and
> I'd like to generate a jar file so that the application could be run
> with a command-line like
>
>   java -classpath myjarfile.jar TopLevel.mainmodule
>
> This looks pretty easy to do with jythonc, and I've gotten it to work
> on some simple examples.  However my large app does things like
>
>   import TopLevel
>
> from inside TopLevel.mainmodule.  And that doesn't work; I get an
> import error.  I see that the documentation page for jythonc has some
> unfinished sections at the bottom, where it says:
>
>
>   Freezing modules
>
>   jythonc can also be used to freeze a python application. The frozen
>   application can then be distributed and deployed as any other java
>   application.
>
>   Some diffrences between an interpreted application and a frozen
>   application exists:
>
>     Properties are diffrent. XXX
>     sys.argv[0]
>     loading of python classes.
>
>
> Anyone know the specifics of those differences?  I suspect my troubles
> are coming from "loading of python classes".  In particular, I notice
> that if TopLevel contains an __init__.py file, the import fails, but
> if there's no such module, the import succeeds.
>
> Bill
>
> _______________________________________________
> Jython-users mailing list
> Jython-users@...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

[Jython-users] freezing an application with pythonc? Do Python packages work?

[Bill Janssen <bill@ja...>]

I've got a fairly large Python application working with Jython, and
I'd like to generate a jar file so that the application could be run
with a command-line like

  java -classpath myjarfile.jar TopLevel.mainmodule

This looks pretty easy to do with jythonc, and I've gotten it to work
on some simple examples.  However my large app does things like

  import TopLevel

from inside TopLevel.mainmodule.  And that doesn't work; I get an
import error.  I see that the documentation page for jythonc has some
unfinished sections at the bottom, where it says:


  Freezing modules

  jythonc can also be used to freeze a python application. The frozen
  application can then be distributed and deployed as any other java
  application.

  Some diffrences between an interpreted application and a frozen
  application exists:

    Properties are diffrent. XXX 
    sys.argv[0] 
    loading of python classes. 


Anyone know the specifics of those differences?  I suspect my troubles
are coming from "loading of python classes".  In particular, I notice
that if TopLevel contains an __init__.py file, the import fails, but
if there's no such module, the import succeeds.

Bill

Re: [Jython-users] Jython and Zope

[Samuele Pedroni <pedroni@in...>]

Hi.

[Terry Hancock]
>I was thinking of waiting until the O'Reilly book
>on Jython comes out (I'm not experienced at Java,
>so I don't think the other book is going to help
>me so much), and then having a go at writing such
>a product myself, since I want to do a fairly
>large amount of Jython stuff with Zope. My attraction
>to this is the beauty of having both server and
>client programmed in the same programming language
>(Python),  instead of having to learn and interface
>between two different ones. 

1. I think that what you imagine is doable
2. Honestly it is not clear to me how
 much useful it would be.

 Applets can be a useful tool depending
on the kind of work-distribution between
server and client you want to achieve,
and your deployment scenario.
For sure Jython applets are a bit more
heavy than pure Java ones, counting
the runtime or not.

3. Writing this would require a fair
  amount of Java/Jython expertise,
 especially because at least IMO
it would make sense only if there
is a high-level/smooth and meaningful
interface for talking back to the server,
And for this there are no standard pre-built
solutions.

So much with ranting.

About our book,
[before having an unhappy reader]

we try to supply valuable information
to both audiences, Java-to-Jython
and from-Python-to-Java/Jython

To the first audience Java-to-Jython
we teach Jython.

To the second audience [because of space
/market issues, and because there are already
a lot of books and material about Java around]
we supply comparative information
CPython/Jython and Java/Python but we
still expect that they will read/obtain
introductory Java information from other sources.
If someone comes from Python and have
just gone through some introduction to Java,
he will still have a lot of expections
about what he can do and how because
of the CPython background, we try to
offer valuable information for the cases
where those expections are going to become
gotchas or delusional. There are aspects
of Jython that unless you are a Java 
and Python expert and have possibly
looked at the implementation can seem
just arbitrary [more on a different post].

I don't think there is a sensible and valuable
way to explain and teach Jython as

Python + an Extension-that-is-a-Python-view-on-
Java

and then  you are done with it.

Java is not simply a language, it is a platform
and rich library too.

regards, Samuele Pedroni.