jython-users — Discussion of and questions about using Jython

[Jython-users] telnetlib

[Frank I. <fra...@gm...>]

Hello again, 
first, thanks for the hint about popen(I just missed the note in the README)
Something else...
Telnetlib is part of the jython standard lib. But telnetlib.py needs
"select" which is no jython module. Python has a "select" extension which works for
sockets only on NT ..
Is there way to use telnet with jython on NT??? 
Thanks, Ciao Frank

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RE: [Jython-users] import from jar--clarification

[Phil S. <psu...@es...>]

Great tip Carlos!

So, if you change to your jython home directory and create a lib.jar like
this:
>jar -cvf lib.jar Lib
Then you can invoke jython like this:
>java -cp jython.jar -Dpython.path=lib.jar!Lib org.python.util.jython
and all your imports will work...

To verify that the .py files are really coming from lib.jar and not from
the $JYTHON_HOME/Lib directory, you might want to rename the Lib directory
temporarily. Jython seems to be able to search for the Lib directory
based on the location of jython.jar, though how it does this I do
not know.

-----Original Message-----
From: Carlos Quiroz [mailto:car...@we...]
Sent: Monday, September 17, 2001 3:55 AM
To: jyt...@li...
Subject: Re: [Jython-users] import from jar--clarification


On Monday 17 September 2001 05:40, Antonio Rodriguez wrote:
To do this you can bundle your py file into a subdir for the module, let say

subdir util and filt util1, then it will be in the jar util.jar. You can add

the jar to the sys.path by doing

import sys
sys.path.append("/path/to/jar/util.jar!util");

after this is possible to do

from util import util1

You can also do this in java via

PySystemState sys = Py.getSystemState();
sys.path.append(new PyString("/path/to/jar/util.jar!util"));

Notice that this works only in jython 2.1a3

Therefore you can bundle all standard libraries in a lib.jar and do

sys.path.append("/path/to/jar/lib.jar!Lib")

Regards

> Let me clarify:
>
> Im not asking how to put classes in the classpath. I'm asking how to put
> all of the standard python library (the .py modules like re.py and
> httplib.py) that compile to *$py.class into a jar in such a way that when
a
> PythonInterpreter runs over the line: import re, it can import the python
> library from a jar.
>
>
> Thanks.
>
>
> -|dman <ds...@ri...> wrote on Sun Sep 16 20:56:03 EDT 2001:
>
> On Sun, Sep 16, 2001 at 05:11:10PM -0400, Antonio Rodriguez wrote:
> | How do I put a jar in the path of a PythonInterpreter object?
>
> $ java -help
> Usage: java [-options] class [args...]
>            (to execute a class)
>    or  java -jar [-options] jarfile [args...]
>            (to execute a jar file)
>
> where options include:
>     -client       to select the "client" VM
>     -server       to select the "server" VM
>     -classic      to select the "classic" VM
>                   If present, the option to select the VM must be first.
>                   The default VM is -client.
>
>     -cp -classpath <directories and zip/jar files separated by :>
>                   set search path for application classes and resources
>     -D<name>=<value>
>                   set a system property
>     -verbose[:class|gc|jni]
>                   enable verbose output
>     -version      print product version and exit
>     -showversion  print product version and continue
>     -? -help      print this help message
>     -X            print help on non-standard options
>
> $
>
>
> The use -classpath option to the JVM you run jython with.
>
> HTH,
> -D
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>
>
>
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> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

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RE: [Jython-users] import from jar--clarification

[Phil S. <psu...@es...>]

I've been wrestling with the same problem, just posted to 
jython-dev about it in fact.

As far as I can tell, what you want to do is not supported but
you can add support with the following patch to
org/jython/core/imp.java in jython-2.1a3:
imp.java
498a499,502
>         //if it's not a builtin or in the python path, try the classpath
>         ret = loadFromClassLoader(name, imp.class.getClassLoader());
>         if (ret != null) return ret;
>

Then you need to add the standard modules to the jython.jar file.
I have an ant file that does this if you're interested.

-----Original Message-----
From: Antonio Rodriguez [mailto:An...@ho...]
Sent: Sunday, September 16, 2001 10:40 PM
To: jyt...@li...; ds...@ri...
Subject: Re: [Jython-users] import from jar--clarification


Let me clarify:

Im not asking how to put classes in the classpath. I'm asking how to put all
of the standard python library (the .py modules like re.py and httplib.py)
that compile to *$py.class into a jar in such a way that when a
PythonInterpreter runs over the line: import re, it can import the python
library from a jar.


Thanks.


-|dman <ds...@ri...> wrote on Sun Sep 16 20:56:03 EDT 2001: 

On Sun, Sep 16, 2001 at 05:11:10PM -0400, Antonio Rodriguez wrote:
| How do I put a jar in the path of a PythonInterpreter object?

$ java -help
Usage: java [-options] class [args...]
           (to execute a class)
   or  java -jar [-options] jarfile [args...]
           (to execute a jar file)

where options include:
    -client       to select the "client" VM
    -server       to select the "server" VM
    -classic      to select the "classic" VM
                  If present, the option to select the VM must be first.
                  The default VM is -client.

    -cp -classpath <directories and zip/jar files separated by :>
                  set search path for application classes and resources
    -D<name>=<value>
                  set a system property
    -verbose[:class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -showversion  print product version and continue
    -? -help      print this help message
    -X            print help on non-standard options

$


The use -classpath option to the JVM you run jython with.

HTH,
-D


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RE: [Jython-users] jnios/os.popen problem

[Phil S. <psu...@es...>]

I just install jnios last night. The readme says=20

"fdopen() is now implemented and works. popen() is implemented but for =
some
reason it fails to run on Windows NT. Remarks from some people =
(tim_one) who
know Windows a lot better than I ever will, have led me to believe that =
a
functional popen() on Win32 should not be expected."

... so if you're using Windows, you're out of luck.

-----Original Message-----
From: Frank Immich [mailto:fra...@gm...]
Sent: Monday, September 17, 2001 3:51 AM
To: jyt...@li...
Subject: [Jython-users] jnios/os.popen problem


Hello,=20
I recently installed jnios for jython, to get the full os support.=20
When I run os.sysem("dir") in my jython shell everything is fine,=20
but os.popen("dir").read() does not work.  I get the error message:
"Es steht nicht genug Speicherplatz auf dem Datentr=E4ger zur =
Verf=FCgung."
which means something like: There is not enough space on your disk  ?
I think 9 GB should be enough for this command ;-) .. must be an other
problem.
Any help welcomed...
Thanks, Ciao Frank

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Re: [Jython-users] jnios/os.popen problem

[Carlos Q. <car...@we...>]

Hi, this module is very interesting. Finn, could you publish linux and/or=
=20
solaris native libs. I'm trying to compile it for linux, with little suce=
ss=20
:-(


Regards

> Hello,
> I recently installed jnios for jython, to get the full os support.
> When I run os.sysem("dir") in my jython shell everything is fine,
> but os.popen("dir").read() does not work.  I get the error message:
> "Es steht nicht genug Speicherplatz auf dem Datentr=E4ger zur Verf=FCgu=
ng."
> which means something like: There is not enough space on your disk  ?
> I think 9 GB should be enough for this command ;-) .. must be an other
> problem.
> Any help welcomed...
> Thanks, Ciao Frank

Re: [Jython-users] import from jar--clarification

[Carlos Q. <car...@we...>]

On Monday 17 September 2001 05:40, Antonio Rodriguez wrote:
To do this you can bundle your py file into a subdir for the module, let say 
subdir util and filt util1, then it will be in the jar util.jar. You can add 
the jar to the sys.path by doing

import sys
sys.path.append("/path/to/jar/util.jar!util");

after this is possible to do

from util import util1

You can also do this in java via

PySystemState sys = Py.getSystemState();
sys.path.append(new PyString("/path/to/jar/util.jar!util"));

Notice that this works only in jython 2.1a3

Therefore you can bundle all standard libraries in a lib.jar and do

sys.path.append("/path/to/jar/lib.jar!Lib")

Regards

> Let me clarify:
>
> Im not asking how to put classes in the classpath. I'm asking how to put
> all of the standard python library (the .py modules like re.py and
> httplib.py) that compile to *$py.class into a jar in such a way that when a
> PythonInterpreter runs over the line: import re, it can import the python
> library from a jar.
>
>
> Thanks.
>
>
> -|dman <ds...@ri...> wrote on Sun Sep 16 20:56:03 EDT 2001:
>
> On Sun, Sep 16, 2001 at 05:11:10PM -0400, Antonio Rodriguez wrote:
> | How do I put a jar in the path of a PythonInterpreter object?
>
> $ java -help
> Usage: java [-options] class [args...]
>            (to execute a class)
>    or  java -jar [-options] jarfile [args...]
>            (to execute a jar file)
>
> where options include:
>     -client       to select the "client" VM
>     -server       to select the "server" VM
>     -classic      to select the "classic" VM
>                   If present, the option to select the VM must be first.
>                   The default VM is -client.
>
>     -cp -classpath <directories and zip/jar files separated by :>
>                   set search path for application classes and resources
>     -D<name>=<value>
>                   set a system property
>     -verbose[:class|gc|jni]
>                   enable verbose output
>     -version      print product version and exit
>     -showversion  print product version and continue
>     -? -help      print this help message
>     -X            print help on non-standard options
>
> $
>
>
> The use -classpath option to the JVM you run jython with.
>
> HTH,
> -D
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>
>
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] jnios/os.popen problem

[Frank I. <fra...@gm...>]

Hello, 
I recently installed jnios for jython, to get the full os support. 
When I run os.sysem("dir") in my jython shell everything is fine, 
but os.popen("dir").read() does not work.  I get the error message:
"Es steht nicht genug Speicherplatz auf dem Datenträger zur Verfügung."
which means something like: There is not enough space on your disk  ?
I think 9 GB should be enough for this command ;-) .. must be an other
problem.
Any help welcomed...
Thanks, Ciao Frank

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[Jython-users] how to import module from jar

[Greg J. <gj...@al...>]

Hi, I've created a module "foo" which is defined in a file
foo.py and which jython seems to automatically precompile
into a file foo$py.class the first time I import it.  What
I'd like to do is put that .class file in a jar file and
have jython import it from there, but listing the jar file
in the python.path registry variable doesn't seem to work.
Any ideas?  Thanks, -Greg

Re: [Jython-users] import from jar--clarification

[Antonio R. <An...@ho...>]

Let me clarify:

Im not asking how to put classes in the classpath. I'm asking how to put all of the standard python library (the .py modules like re.py and httplib.py) that compile to *$py.class into a jar in such a way that when a PythonInterpreter runs over the line: import re, it can import the python library from a jar.


Thanks.


-|dman <ds...@ri...> wrote on Sun Sep 16 20:56:03 EDT 2001: 

On Sun, Sep 16, 2001 at 05:11:10PM -0400, Antonio Rodriguez wrote:
| How do I put a jar in the path of a PythonInterpreter object?

$ java -help
Usage: java [-options] class [args...]
           (to execute a class)
   or  java -jar [-options] jarfile [args...]
           (to execute a jar file)

where options include:
    -client       to select the "client" VM
    -server       to select the "server" VM
    -classic      to select the "classic" VM
                  If present, the option to select the VM must be first.
                  The default VM is -client.

    -cp -classpath <directories and zip/jar files separated by :>
                  set search path for application classes and resources
    -D<name>=<value>
                  set a system property
    -verbose[:class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -showversion  print product version and continue
    -? -help      print this help message
    -X            print help on non-standard options

$


The use -classpath option to the JVM you run jython with.

HTH,
-D


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Re: [Jython-users] import from jar

[dman <ds...@ri...>]

On Sun, Sep 16, 2001 at 05:11:10PM -0400, Antonio Rodriguez wrote:
| How do I put a jar in the path of a PythonInterpreter object?

$ java -help
Usage: java [-options] class [args...]
           (to execute a class)
   or  java -jar [-options] jarfile [args...]
           (to execute a jar file)

where options include:
    -client       to select the "client" VM
    -server       to select the "server" VM
    -classic      to select the "classic" VM
                  If present, the option to select the VM must be first.
                  The default VM is -client.

    -cp -classpath <directories and zip/jar files separated by :>
                  set search path for application classes and resources
    -D<name>=<value>
                  set a system property
    -verbose[:class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -showversion  print product version and continue
    -? -help      print this help message
    -X            print help on non-standard options

$


The use -classpath option to the JVM you run jython with.

HTH,
-D

[Jython-users] import from jar

[Antonio R. <An...@ho...>]

How do I put a jar in the path of a PythonInterpreter object?

Re: [Jython-users] Jython and forking processes

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

Check out http://sourceforge.net/projects/jnios/

 utah: /home/mudd/jnios-1.7[1]    jython
Jython 2.1a1 on java1.3.0 (JIT: jitc)
Type "copyright", "credits" or "license" for more information.
>>> import jnios
>>> dir(jnios)
['PosixFile', '__name__', 'errno', 'os', 'posix']
>>> from jnios import os
>>> dir(os)
['F_OK', 'O_APPEND', 'O_CREAT', 'O_DSYNC', 'O_EXCL', 'O_NDELAY',
'O_NOCTTY', 'O_NONBLOCK', 'O_RDONLY', 'O_RDWR', 'O_RSYNC', 'O_SYNC',
'O_TRUNC', 'O_WRONLY', 'R_OK', 'UserDict', 'WEXITSTATUS', 'WIFEXITED',
'WIFSIGNALED', 'WIFSTOPPED', 'WNOHANG', 'WSTOPSIG', 'WTERMSIG', 'W_OK',
'X_OK', '_Environ', '_execvpe', '_exit', '_notfound', 'access',
'altsep', 'chdir', 'chmod', 'chown', 'close', 'curdir', 'defpath',
'dup', 'dup2', 'environ', 'error', 'execl', 'execle', 'execlp',
'execlpe', 'execv', 'execve', 'execvp', 'execvpe', 'fdatasync',
'fdopen', 'fork', 'fstat', 'fstatvfs', 'fsync', 'ftruncate', 'getLock',
'getcwd', 'getegid', 'geteuid', 'getgid', 'getpgrp', 'getpid',
'getppid', 'getuid', 'kill', 'linesep', 'link', 'listdir', 'lockf',
'lseek', 'lstat', 'makedirs', 'mkdir', 'mkfifo', 'name', 'nice',
'open', 'pardir', 'path', 'pathsep', 'pipe', 'popen', 'putenv', 'read',
'readlink', 'remove', 'removedirs', 'rename', 'renames', 'rmdir',
'sep', 'setLock', 'setgid', 'setpgid', 'setpgrp', 'setsid', 'setuid',
'stat', 'strerror', 'symlink', 'sys', 'system', 'tcgetpgrp',
'tcsetpgrp', 'times', 'ttyname', 'umask', 'uname', 'unlink', 'utime',
'wait', 'waitpid', 'write']
>>> os.system('ls')
Makefile	   errno.dll	      mudd.tar.gz     pyutil.h
Makefile,v	   errno.o	      mytime.h	      pyutil.o
Makefile.mvc	   jnios	      notes	      t.py
PosixFile.cpp	   jnios.jar	      posix.cpp       test.class
PosixFile.o	   jnios_PosixFile.h  posix.cpp,v     test.java
Readme_jnios.html  jnios_errno.h      posix.dll       test.java,v
apidoc		   jnios_posix.h      posix.o	      testLock.py
config.h	   jnios_posix.h,v    posix.txt       testLock.py,v
cos$py.class	   junk4	      posix.uuencode  xxxx
cos.py		   liberrno.so	      posixmodule.h   xxxxx
errno.cpp	   libposix.so	      pyutil.cpp
0
>>> 
 utah: /home/mudd/jnios-1.7[1]  




--- Arne Wulvik <wu...@pr...> wrote:
> Hi!
> 
> Kind of a newbie question, but:
> 
> I'd like to be able to start other processes, like shell scripts, on
> the os (nt or unix) from a Jython script. I thought I could use
> os.fork, or os.system but they are not available in the
> java-dependent module used by os. Do I have to look for some java
> classes that does the trick?
> 
> Any suggestions?
> 
> Arne
> 
> 
> 
> 


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RE: [Jython-users] Embeding (J)Python in Java

[Jim A. <Ji...@do...>]

Have you looked at Bruce Eckel's book 'Thinking in Patterns' Chapter 9 ? It
it available online and has some good examples to get you started; the link
is on jython.org or here:

http://www.mindview.net/Books/TIPatterns/

> -----Original Message-----
> From: Christoph Romann [mailto:rom...@zh...]
> Sent: Friday, September 14, 2001 1:03 AM
> To: jyt...@li...
> Subject: [Jython-users] Embeding (J)Python in Java
> 
> 
> Hello Guys
> 
> I need some help in ebedding python into java.
> does anyone has a better documentation on this topic as on jython.org
> available?
> 
> or are there more examples available?
> 
> Thanx for your help.
> 
> Chris
> 
> 
> Content Security by MailMarshal
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
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> 

RE: [Jython-users] Embedding (J)Python in Java

[Anthony E. <ae...@si...>]

Rather than embedding Jython directly I would suggest looking at IBM's Bean
Scripting Framework: http://oss.software.ibm.com/developerworks/projects/bsf

Using this framework will allow you to support more than just Python within
your Java applications and it includes a sufficient amount of documentation.

Sincerely,
Anthony Eden

-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Christoph
Romann
Sent: Friday, September 14, 2001 5:03 AM
To: jyt...@li...
Subject: [Jython-users] Embeding (J)Python in Java


Hello Guys

I need some help in ebedding python into java.
does anyone has a better documentation on this topic as on jython.org
available?

or are there more examples available?

Thanx for your help.

Chris


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RE: [Jython-users] Simple java class import

[Humbel O. <Otm...@bi...>]

[ Samuele Pedroni ]

> The idea of the patch is fine for me, on the other hand
> it needs some work to better integrate with the rest
> of the import logic.
>=20
> In any case I would like to understand why so often
> jars are reported as bad, this should be quite rare...
>=20
> I think we should dig into that.


Please let me try to describe the problem we have with our jar file.
First at all, I think it is not a Jython issue. If
java.util.Locale.getAvailableLocales() is called with this jar file in
the classpath, we get:
	'file IO Exception:java.util.zip.ZipException: invalid EXT
descriptor signature'

How do we create the jar file ? We start with a valid jar file named
external.jar, which contains all the classes from packages we don't have
the source code. external.jar for example contains:
	com.sun.mail
	javax.infobus
	oracle.jdbc
	etc.
Each night we make our application, resulting in packages CH.obj.XYZ.
Then we add these classes into a copy of external.jar (named
bisonInfra.jar), and the result has the invalid EXT descriptor
signature. We have tried every version of PKZIP and many different
combination of classes in external.jar, always with the same result.
Funny enough, the invalid EXT descriptor always occurs in the same
package/class.

I tend to blame PKZIP for that (but its only a guess), because if we do
it manually (either with jar or WinZip):
	- unpack all directories from external.jar
	- adjust the upper/lower case of some directories (greetings
from Windows)
	- pack the whole directory tree into an empty jar file
the resulting jar is valid.=20
We simply can't do it right automatically.


We test our classpath with the following script (snippet):


    #
    # scan the whole class path for .jar's and .zip's
    #=20
    def testJarsOnClasspath( self ):

        # split the classpath into entries
        pathSep =3D System.getProperty( "path.separator" )
        classpath =3D System.getProperty("java.class.path")
        pathEntries =3D string.split( classpath, pathSep )

        # prepare the error dictionary
        self._errors =3D {}

        # test the files on classpath
        for pathEntry in pathEntries:
            suffix =3D pathEntry[-4:]
            if suffix =3D=3D ".jar" or suffix =3D=3D ".zip":
                self.__checkJarFile( pathEntry )

        # report the errors
        if self._errors:
            message =3D "The following jar (or zip) files have errors: =
\n"
            for jarFile in self._errors.keys():
                message =3D "%s *** %s ***  (in %s) \n" % (message,
self._errors[jarFile], jarFile )
            print message



    #
    # check a single jar file and add errors to self._errors
    #=20
    def __checkJarFile( self, jarFilePath ):
        print "checking %s" % jarFilePath
        zipFile =3D ZipInputStream( FileInputStream( File(jarFilePath) )
);
        try:
            entry =3D zipFile.getNextEntry()
            while entry !=3D None:
                if self._debug: print entry.getName()
                entry =3D zipFile.getNextEntry()
        except ZipException, ze:
            if self._debug: ze.printStackTrace()
            self._errors[ jarFilePath] =3D ze.getMessage()


Best wishes,
Oti.

Re: [Jython-users] List problem

[Kevin M. <kev...@er...>]

Thanks for all the tips!  I feel very eco-friendly reusing my objects.

/Kevin


On Wed, 12 Sep 2001, Ype Kingma wrote:

> >Hi,
> >
> >why does the following not work:
> >
> >a = [1, 2]
> >for i in a:
> >	a.remove(i)
> >
> >
> >The loop exits after the first iteration leaving a = [2]
> >
> >How do I get around this problem?
>
> Iterating over a list that is being modified results
> in undefined behaviour. A better way is:
>
>     for i in a[:]: # iterate over a copy
>          a.remove(i) # remove from original
>
> The problem with this is that it still needs to access each element
> in the list (at least twice).
>
> When you need to remove some of the elements in a list you could
> also use list comprehensions, but these always create a new list:
>
>     a = [i for i in a if not someRemoveCondition(i)]
>
>
> To empty a list in a single operation you can also:
>
>     a[:] = [] # modify in place to become an empty list. (A)
>
> or
>
>     a = [] # change to refer to a new empty list object. (B)
>
> or, preferably:
>
>     del a[:] # modify in place deleting all entries (C)
>
> The last variant does not create a new object, which can make a measurable
> difference for garbage collection in case it avoids creating a lot of them.
> This technique is also known as reusing existing objects.
> I have never measured the difference between (A) and the other
> two, but (C) is definitely faster than (B) in Jython.
> It is probably faster in CPython, too.
>
> >
> >Any help appreciated,
> >Kevin
>
> My pleasure,
> Ype
>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>

_________________________________________________
Name/Title : Kevin McNamee, Software Consultant
Phone      : +46 13 32 1165

Re: [Jython-users] Embeding (J)Python in Java

[Arne W. <wu...@pr...>]

Hi!

I found that most of what I wanted to achieve with the embedding, at least
at this stage, was quite easily done by looking at the PythonInterpreter
class and experimenting with that. However, I too would like to see some
better documentation and examples. So far I haven't found anything more
useful than the documents at jython.org

Arne


----- Original Message -----
From: "Christoph Romann" <rom...@zh...>
To: <jyt...@li...>
Sent: Friday, September 14, 2001 11:02 AM
Subject: [Jython-users] Embeding (J)Python in Java


> Hello Guys
>
> I need some help in ebedding python into java.
> does anyone has a better documentation on this topic as on jython.org
> available?
>
> or are there more examples available?
>
> Thanx for your help.
>
> Chris
>
>
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>
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

[Jython-users] Embeding (J)Python in Java

[Christoph R. <rom...@zh...>]

Hello Guys

I need some help in ebedding python into java.
does anyone has a better documentation on this topic as on jython.org
available?

or are there more examples available?

Thanx for your help.

Chris


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Re: [Jython-users] Problems with two files

[Christoph R. <rom...@zh...>]

Hello

it seems to me as there is a class file missing. i had also error messages
like this (no code in line 0). As i browsed through the code, i noticed, 
several java files were not compiled. So i got this not very meaniful
error messages. since i compiled the whole stuff, every thing works fine.

I didn't see misspelled code, but my strenght is Java and not python so i
can't guarantee this.

Which version of Jython are you running? I'm using 2.0 and there i get
serveral error messages out of the python code, before my *.py files are
involved.

Greets

Chris 


ps: i'm reesusing python modules in a J2EE environment


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[Jython-users] Problems with two files

[C. P. B. <cpo...@ho...>]

I don't know how to get a multi-file program byte-compiled properly.  I
wrote two simple files - one has a base class, and the other one imports
that module, and defines another class that inherits from that first class.
Here they are:

base.py:
class main:
   def funcMain(self):
      print "main func"

sub.py:
import base

class sub(base.main):
   def funcSub(self):
      print "sub func"

if __name__=="__main__":
   a = sub()
   a.funcMain()
   a.funcSub()


Running sub.py works just fine in cpython and jython.  When I run jythonc it
compiles.  In the current directory, it creates a file called base$py.class.
It also creates a jpywork/ directory which contains the files
sub$_PyInner.class,  sub.class, and  sub.java.
When I try to run java sub from the jpywork/ directory, I get this error:
java sub
Java Traceback:

        at org.python.core.Py.ImportError(Py.java:180)
        at org.python.core.imp.load(imp.java:368)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:447)
        at org.python.core.imp.importName(imp.java:509)
        at org.python.core.ImportFunction.load(__builtin__.java:967)
        at org.python.core.ImportFunction.__call__(__builtin__.java:961)
        at org.python.core.PyObject.__call__(PyObject.java:250)
        at org.python.core.__builtin__.__import__(__builtin__.java:921)
        at org.python.core.imp.importOne(imp.java:518)
        at sub$_PyInner.main$3(sub.java:56)
        at sub$_PyInner.call_function(sub.java:38)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.imp.createFromCode(imp.java:157)
        at org.python.core.Py.runMain(Py.java:798)
        at sub.main(sub.java:76)
Traceback (innermost last):
  File "D:\junk\sub.py", line 0, in main
ImportError: no module named base

I also tried compiling base.py separately, but still no dice.  What am I
doing wrong?

--------------------------------------------------------------------------
C. Porter Bassett       cporter at byu dot edu     www.et.byu.edu/~porter
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Re: [Jython-users] typecasting?

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

Stefan Farestam wrote:
> 
> Suppose that I create a class A that is a subclass of a Java class.
> How can I convert instances of the baseclass to instances of the
> subclass?

Usually, the desire to convert instances of a base class into instances of a subclass indicates a design flaw.

That said, when it is needed, you create a constructor of the subclass that takes the base class instance and constructs a new instance that either wraps the base class instance or copies its data (a copy constructor).

kb

RE: [Jython-users] Simple java class import

[Humbel O. <Otm...@bi...>]

[ Finn Bock ]

> I agree again. I hope you at least understand why importing java
> packages fails.

Yes, of course. The 'what java can load' was meant for single java
classes.

> Please add this as a patch to the SF patch manager. That way=20
> we will not forget it.

I hope patch #461151 is what you meant and need.

> Of the top of my head, I kinda like it. It a pragmatic solution to a
> huge problem which we (I fear) will never resolve perfectly.

Pleased to hear that - thank you very much!


May I ask a follow up:=20

When I use Jython as an embedded scripting language, the package manager
will not scan the .jar files, I assume ?
If so, there normally is the need for sys.add_package() in embedded
scripts.=20
The suggested patch eliminates this need if java classes are imported
explicitly ?


Best wishes,
Oti.

[Jython-users] problems with jythonc

[Christoph R. <rom...@zh...>]

Hi all

thanx a lot for your help, kevin. i analyzed the code so far and their are
no
zope specialytiesintegrated. The C parts are also no Problem.

But when i now use the jythonc tool from, i don't work properly. it stopps
work before parsing begins.
This is the error message:
C:\DA_Comit\src\python>jythonc --deep --workdir C:\DA_Comit\src
BlackScholes.py
processing BlackScholes
Traceback (innermost last):
  File "C:\Program Files\jython-21a3\Tools\jythonc\jythonc.py", line 5, in
?
  File "C:\Program Files\jython-21a3\Tools\jythonc\main.py", line 300, in
main
  File "C:\Program Files\jython-21a3\Tools\jythonc\main.py", line 219, in
doCompile
  File "C:\Program Files\jython-21a3\Tools\jythonc\compile.py", line 195,
in compilefile
  File "C:\Program Files\jython-21a3\Tools\jythonc\compile.py", line 209,
in compile
  File "C:\Program Files\jython-21a3\Tools\jythonc\BaseEvaluator.py", line
310, in execstring
  File "<string>", line 102
SyntaxError: invalid syntax

I don't know what i should do next. 

May I have to replce the C extensions before i use jythonc?

I'm looking to here from you.

Greets

Chris


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[Jython-users] typecasting?

[Stefan F. <st...@ti...>]

Suppose that I create a class A that is a subclass of a Java class.
How can I convert instances of the baseclass to instances of the
subclass?

Thanks,
Stefan

[Jython-users] packages

[C. P. B. <cpo...@ho...>]

I am trying to write a class in jython that inherits from a java class and
will be used in a java program.  (See my earlier message about robocode).
Some people have suggested that I haven't declared my class to be in a
package?  I don't really understand how packages work in java, but in jython
how do I set a class to be part of a package?
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C. Porter Bassett       cporter at byu dot edu     www.et.byu.edu/~porter
odigo #: 3854128           ICQ #:38435505          AIM ID: cporterbassett
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"Pretend like this is a really witty saying." - Anonymous
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