jython-users — Discussion of and questions about using Jython

[Jython-users] @sig doesn't seem to work

[Brad C. <bk...@mu...>]

For some reason the @sig line in the code below doesn't work. The 
resulting .java file doesn't have a public Put() method..

I added java.lang to the String type to see if that would fix it.. no go (the 
web docs say that all types *except* those in java.lang need to be fully 
specified, yet the example on the web page does have java.lang.String 
spelled out).

Does anyone have any ideas?

-- Python Code --

# FTPClient

from ftplib import FTP

class FTPClient:
    def __init__(self):
        pass

    def Put(self,host,user,passwd,fileName,filePath):
        "@sig public void Put(java.lang.String host, java.lang.String user, 
java.lang.String passwd, java.lang.String fileName, java.lang.String 
filePath)"
        ftp = FTP(host,user,passwd)
        file = open(filePath,"rb");
        ftp.storbinary("stor "+fileName,file,512)
        ftp.quit()


--- Resulting Java  Class

package tinitools;

import org.python.core.*;

public class FTPClient extends java.lang.Object {
    static String[] jpy$properties = new String[] {"python.modules.builtin", "exceptions:org.python.core.exceptions", "python.options.showJavaExceptions", "true"};
    static String[] jpy$packages = new String[] {"org.python.core", null, "java.lang", null, "java.io", null, "java.net", null};
    
    public static class _PyInner extends PyFunctionTable implements PyRunnable {
        private static PyObject s$0;
        private static PyObject s$1;
        private static PyObject s$2;
        private static PyObject s$3;
        private static PyObject i$4;
        private static PyFunctionTable funcTable;
        private static PyCode c$0___init__;
        private static PyCode c$1_Put;
        private static PyCode c$2_FTPClient;
        private static PyCode c$3_main;
        private static void initConstants() {
            s$0 = Py.newString("E:\\prj\\src\\jbuilder\\tini\\python\\FTPClient.py");
            s$1 = Py.newString("@sig public void Put(java.lang.String host, java.lang.String user, java.lang.String passwd, java.lang.String fileName, java.lang.String filePath)");
            s$2 = Py.newString("rb");
            s$3 = Py.newString("stor ");
            i$4 = Py.newInteger(512);
            funcTable = new _PyInner();
            c$0___init__ = Py.newCode(1, new String[] {"self"}, "E:\\prj\\src\\jbuilder\\tini\\python\\FTPClient.py", "__init__", false, false, funcTable, 0);
            c$1_Put = Py.newCode(6, new String[] {"self", "host", "user", "passwd", "fileName", "filePath", "ftp", "file"}, "E:\\prj\\src\\jbuilder\\tini\\python\\FTPClient.py", "Put", false, false, funcTable, 1);
            c$2_FTPClient = Py.newCode(0, new String[] {"__init__", "Put"}, "E:\\prj\\src\\jbuilder\\tini\\python\\FTPClient.py", "FTPClient", false, false, funcTable, 2);
            c$3_main = Py.newCode(0, new String[] {}, "E:\\prj\\src\\jbuilder\\tini\\python\\FTPClient.py", "main", false, false, funcTable, 3);
        }
        
        
        public PyCode getMain() {
            if (c$3_main == null) _PyInner.initConstants();
            return c$3_main;
        }
        
        public PyObject call_function(int index, PyFrame frame) {
            switch (index){
                case 0:
                return _PyInner.__init__$1(frame);
                case 1:
                return _PyInner.Put$2(frame);
                case 2:
                return _PyInner.FTPClient$3(frame);
                case 3:
                return _PyInner.main$4(frame);
                default:
                return null;
            }
        }
        
        private static PyObject __init__$1(PyFrame frame) {
            // pass
            return Py.None;
        }
        
        private static PyObject Put$2(PyFrame frame) {
            /* @sig public void Put(java.lang.String host, java.lang.String user, java.lang.String passwd, java.lang.String fileName, java.lang.String filePath) */
            frame.setlocal(6, frame.getglobal("FTP").__call__(frame.getlocal(1), frame.getlocal(2), frame.getlocal(3)));
            frame.setlocal(7, frame.getglobal("open").__call__(frame.getlocal(5), s$2));
            frame.getlocal(6).invoke("storbinary", new PyObject[] {s$3._add(frame.getlocal(4)), frame.getlocal(7), i$4});
            frame.getlocal(6).invoke("quit");
            return Py.None;
        }
        
        private static PyObject FTPClient$3(PyFrame frame) {
            frame.setlocal("__init__", new PyFunction(frame.f_globals, new PyObject[] {}, c$0___init__));
            frame.setlocal("Put", new PyFunction(frame.f_globals, new PyObject[] {}, c$1_Put));
            return frame.getf_locals();
        }
        
        private static PyObject main$4(PyFrame frame) {
            frame.setglobal("__file__", s$0);
            org.python.core.imp.importFromAs("ftplib", new String[] {"FTP"}, new String[] {"FTP"}, frame);
            frame.setglobal("FTPClient", Py.makeClass("FTPClient", new PyObject[] {}, c$2_FTPClient, null));
            return Py.None;
        }
        
    }
    public static void moduleDictInit(PyObject dict) {
        dict.__setitem__("__name__", new PyString("FTPClient"));
        Py.runCode(new _PyInner().getMain(), dict, dict);
    }
    
    public static void main(String[] args) {
        String[] newargs = new String[args.length+1];
        newargs[0] = "FTPClient";
        System.arraycopy(args, 0, newargs, 1, args.length);
        Py.runMain("tinitools.FTPClient$_PyInner", newargs, jpy$packages, jpy$properties, "tinitools", new String[] {"FTPClient", "sre_compile", "javapath", "sre_constants", "sre_parse", "string", "copy_reg", "ftplib", "javaos", "socket", "re", "sre"});
    }
    
}


Brad Clements,                bk...@mu...   (315)268-1000
http://www.murkworks.com                          (315)268-9812 Fax
netmeeting: ils://ils.murkworks.com               AOL-IM: BKClements

[Jython-users] exec <file> in <dictionary>

[brian z. <bz...@zi...>]

I was trying to use the following syntax in Jython but I get an exception:

>>> t = {}
>>> exec open(filename) in t

Traceback (innermost last):
  File "install.py", line 381, in ?
  File "install.py", line 47, in run
  File "install.py", line 71, in detectComponents
  File "install.py", line 89, in readProperties
TypeError: exec: argument 1 must be string or code object

This works in CPython and appears to be part of the spec:

"The first expression should evaluate to either a string, an open file
object, or a code object. ...  If it is an open file, the file is parsed
until EOF and executed."

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

Additionally, in CPython 2.0, if the file is closed it is re-opened and
executed.

I also tested whether StringIO could be substited for a file and it appears
to fail:

>>> from StringIO import StringIO
>>> s = StringIO("a = 'x'")
>>> s
<StringIO.StringIO instance at 007E1C1C>
>>> t = {}
>>> exec s in t
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: exec 1st arg must be string, code or file object
>>>

Given this, I've enclosed a working diff which mimics the exact behaviour of
CPython 2.0.

thanks,

brian

[Jython-users] Jython 2.0b1 imports failed (CNF), worked in JPython

[Brad C. <bk...@mu...>]

I'm writing a Console Snapin for Novell's Console One application.

I had this working in JPython (last rev), but recompiling with Jython 
2.0b1 produces a .class that fails to function. 

Unfortunately I did my earlier work using ConsoleOne 1.2c, but 
upgraded to 1.2d at the same time I switched to Jython. (stupid, I know).

I don't think the ConsoleOne upgrade is related to the failure.

Anyway, here's the scoop.

1. The Python code fragment:

from com.novell.application.console.snapin import Registration
from com.novell.application.console.snapin import RegistrationItem
from com.novell.application.console.snapin import scope
from com.novell.application.console.snapin import Shell

from com.novell.admin.ns.nds import NDSNamespace
from jarray import array

class   FTPDSnapin_Registration(Registration):
    def __init__(self):
        pass
    def getRegistration(self):
        "@sig public com.novell.application.console.snapin.RegistrationItem[] getRegistration()"
        myscope = scope.NamespaceTypeScope(Shell.SNAPIN_PAGE,NDSNamespace.name,"User")
        info = array([RegistrationItem(myscope,"com.MurkWorks.FTPD.FTPDSnapin_PageSnapin")],RegistrationItem)
        return info



2. The import that's failing is 

from com.novell.admin.ns.nds import NDSNamespace

This class is in ConsoleOne.jar, which is in my classpath.

Running jython interactively produces this:

Jython 2.0beta1 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> from com.novell.admin.ns.nds import NDSNamespace
>>> NDSNamespace.name
'NDS'
>>>

So the import works interactively.

3. I use jythonc to create a deep .jar and have it loaded by ConsoleOne. 
ConsoleOne produces this diagnostic info:

Reordered classpath = 
..\ConsoleOne.jar;..\ConsoleOneCore.jar;..\ConsoleOneExt\collections.ja
r;..\ConsoleOneExt\jgl3.1.0.jar;..\ConsoleOneExt\jh.jar;..\ConsoleOneEx
t\Widgets.jar;..\help;..\ConsoleOneExt\njha.jar;..\ConsoleOneExt\jclient.j
ar;..\ConsoleOneExt\jndi.jar;..\ConsoleOneExt\njcl.jar;..\ConsoleOneExt\
NWFS.jar;..\ConsoleOneExt\JReportBeans.zip


(note that ConsoleOne.jar is in the classpath)

Then this exception:


>>> Creating manifest object for C:\Novell\ConsoleOne\1.2\snapins\FTPDSnapin.jar
Collection version = Implementation-Version(null)
Shell version = Specification-Version(null)
Auto detecting registrars in C:\Novell\ConsoleOne\1.2\snapins\FTPDSnapin.jar
    Loading registrar -> class com.MurkWorks.FTPD.FTPDSnapin_Registration
SnapinClassLoader could not load bytes for class com.novell.admin  Throwing ClassNotFoundException.
Exception while trying to instantiate com/MurkWorks/FTPD/FTPDSnapin_Registration.class - Java Traceback:

	at org.python.core.Py.ImportError(Py.java:180)
	at org.python.core.imp.dottedFind(imp.java:414)
	at org.python.core.imp.importName(imp.java:436)
	at org.python.core.imp.importName(imp.java:509)
	at org.python.core.ImportFunction.load(__builtin__.java:962)
	at org.python.core.ImportFunction.__call__(__builtin__.java:956)
	at org.python.core.PyObject.__call__(PyObject.java:250)
	at org.python.core.__builtin__.__import__(__builtin__.java:916)
	at org.python.core.imp.importFromAs(imp.java:566)
	at com.MurkWorks.FTPD.FTPDSnapin_Registration$_PyInner.main$4(FTPDSnapin_Registration.java:79)
	at com.MurkWorks.FTPD.FTPDSnapin_Registration$_PyInner.call_function(FTPDSnapin_Registration.java:48)
	at org.python.core.PyTableCode.call(PyTableCode.java:155)
	at org.python.core.imp.createFromCode(imp.java:157)
	at org.python.core.Py.initProxy(Py.java:726)
	at com.MurkWorks.FTPD.FTPDSnapin_Registration.<init>(FTPDSnapin_Registration.java:105)
	at java.lang.Class.newInstance0(Native Method)
	at java.lang.Class.newInstance(Unknown Source)
	at com.novell.application.console.shell.DefaultSnapinLister.checkForRegistration(DefaultSnapinLister.java)
	at com.novell.application.console.shell.DefaultSnapinLister.autoRegister(DefaultSnapinLister.java)
	at com.novell.application.console.shell.DefaultSnapinLister.loadSCI(DefaultSnapinLister.java)
	at com.novell.application.console.shell.DefaultSnapinLister.loadSCIs(DefaultSnapinLister.java)
	at com.novell.application.console.shell.DefaultSnapinLister.getSnapinCollections(DefaultSnapinLister.java)
	at com.novell.application.console.shell.Registry.registerSnapins(Registry.java)
	at com.novell.application.console.shell.ConsoleShell.start(ConsoleShell.java)
	at com.novell.application.console.shell.Console.main(Console.java)
Traceback (innermost last):
  File "C:\Novell\ConsoleOne\1.2\FTPD\FTPDSnapin_Registration.py", line 0, in main
ImportError: No module named admin

4. I'm using jdk 1.3

Any suggestions?


Brad Clements,                bk...@mu...   (315)268-1000
http://www.murkworks.com                          (315)268-9812 Fax
netmeeting: ils://ils.murkworks.com               AOL-IM: BKClements

RE: [Jython-users] Bummer precision error

[Tim P. <ti...@ho...>]

Adding to Finn Bock's reply, it's almost certainly the case that Scott
(Knight) is running on a platform with IEEE-754 floating-point hardware, and
that the results computed by CPython and Jython were identical.  The
implementations do differ in how they choose to round the display, though;
CPython inherits the fine points of its float I/O from the platform C
library, while Java defines it more rigorously.

And you're going to get the same results in any language if you use floating
point:  Java, Python, Jython, C, C++, Perl, Eiffel, LISP, Scheme, Fortran,
... it doesn't matter.

This link explains one of the fine points in deadly <wink> detail:

    http://www.python.org/cgi-bin/moinmoin/RepresentationError



> test_var = 0.0
> limit = 0.1
> inc = 0.01
>
> while test_var <= limit:
>     print test_var
>     test_var = test_var + inc

Ever since someone first bumped into this in Fortran in the 1950's
(honest!), the "correct" way to write such a loop has been to use an integer
index (say "i"), and compute

     test_var = i * inc

inside the loop.  Each floating-point operation introduces its own rounding
error, and in doing

     test_var = test_var + inc

these errors compound over time.  In

     test_var = i * inc

you only suffer one rounding error in test_var.

However, none of that changes that (for example) 0.9 is not exactly
representable in binary floating-point arithmetic, no matter how you compute
it (see the link above).

Scott, if you're under the illusion <wink> that decimal fractions are a Good
Thing, you'll never be happy with hardware floating point arithmetic.  You
should look into something like Java's BigDecimal class instead:

    http://www2.hursley.ibm.com/decimalj/decdef.html

as-always-the-fast-drives-out-the-sane-ly y'rs  - tim

Re: [Jython-users] Bummer precision error

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

[Scott Knight]

>Hello, my name is Scott and I am a Python newbie (2 months).
>"hello Scott, what brought you here?"
>;^)
>
>Anyway, I am having the time of my programming life learning Python and
>building a serious configuration program in Java/Jython.  What I have
>noticed when I am doing some loops is an annoying precision error that I
>need to work around.  The simple code:
>
>#! /usr/bin/python
>
>test_var = 0.0
>limit = 0.1
>inc = 0.01
>
>while test_var <= limit:
>    print test_var
>    test_var = test_var + inc
>
>always runs to 1 less loop than I need because of this output:
>
>D:\dev\python\test>jython test_loop.py
>0.0
>0.01
>0.02
>0.03
>0.04
>0.05
>0.060000000000000005
>0.07
>0.08
>0.09
>0.09999999999999999
>
>With native Python 2.0 in the same platform and 1.52 on Linux, the
>output is a little different:
>
>D:\dev\python\test>test_loop.py
>0.0
>0.01
>0.02
>0.03
>0.04
>0.05
>0.06
>0.07
>0.08
>0.09
>0.1

First a huge disclaimer: I know nothing about float point numbers or the
strangeness of their implementation.

I think CPython-2.0 is faking the output above. If you add a
repr(test_var) on the print statement, you get (with CPython-2.0 &
win2k):

0.0 0.0
0.01 0.01
0.02 0.02
0.03 0.029999999999999999
0.04 0.040000000000000001
0.05 0.050000000000000003
0.06 0.060000000000000005
0.07 0.070000000000000007
0.08 0.080000000000000002
0.09 0.089999999999999997
0.1 0.099999999999999992

>This is a little more of what I expected.  This trivial example looks
>harmless enough, but it gets out of hand when the loops are in the 100+
>range.  What happens is even the Python only runs to 0.99 instead of 1.0
>like it should.

Because the actual value of the float is about as imprecise in CPython
as it is in Jython and in java.

>The only solution I have come up with is to slightly modify the
>increment like:
>
>    test_var = round((test_var + inc), 2)
>
>so that it cuts off the value every time through.  This seems to work
>well enough, but I am wondering if there is a better way.
>
>I also wonder why Jython puts so many decimal places out when Python
>keeps the original max of 2.  This seems like it could be a Java thing
>to me since I have seen similar behavior in Java programs.

Jython is getting all its float behavior from java, including the string
representation. This cause some difference between CPython, in
particular with CPython-2.0 where the str(0.1) and repr(0.1) return
different string values (at least is does in my w2k).

I don't think the jython implementation of floats and float -> string
conversion will be changed much. It has its flaws, but it is consistent
with java, and java floats are consistent across platforms. That alone
is a valuable improvement compared to CPython (this conclusion is
reached based on reading python-dev, not on any actual knowledge of
CPython).

If jython will be changed to closer compliance with CPython, it will not
be done by me. I'll leave that for experts on floating point
implementations.

regards,
finn

[Jython-users] embedding : problem to close

[Vincent C. <cr...@ne...>]

i have called the PythonInterpreter to execute a python script in a
class
i call it from another class but the interpreter doesn't actually want
to close correctly
how can i do to make it right properly ??
thanks

[Jython-users] Bummer precision error

[Scott K. <sc...@sc...>]

Hello, my name is Scott and I am a Python newbie (2 months).
"hello Scott, what brought you here?"
;^)

Anyway, I am having the time of my programming life learning Python and
building a serious configuration program in Java/Jython.  What I have
noticed when I am doing some loops is an annoying precision error that I
need to work around.  The simple code:

#! /usr/bin/python

test_var = 0.0
limit = 0.1
inc = 0.01

while test_var <= limit:
    print test_var
    test_var = test_var + inc

always runs to 1 less loop than I need because of this output:

D:\dev\python\test>jython test_loop.py
0.0
0.01
0.02
0.03
0.04
0.05
0.060000000000000005
0.07
0.08
0.09
0.09999999999999999

With native Python 2.0 in the same platform and 1.52 on Linux, the
output is a little different:

D:\dev\python\test>test_loop.py
0.0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1

This is a little more of what I expected.  This trivial example looks
harmless enough, but it gets out of hand when the loops are in the 100+
range.  What happens is even the Python only runs to 0.99 instead of 1.0
like it should.

The only solution I have come up with is to slightly modify the
increment like:

    test_var = round((test_var + inc), 2)

so that it cuts off the value every time through.  This seems to work
well enough, but I am wondering if there is a better way.

I also wonder why Jython puts so many decimal places out when Python
keeps the original max of 2.  This seems like it could be a Java thing
to me since I have seen similar behavior in Java programs.

Thanks in advance.
-- 
Scott Knight  mailto:sc...@sc...

[Jython-users] ANN: First beta release of Jython-2.0

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

I am happy to announce the first beta release of Jython 2.0. 

Jython is a Java implementation of the Python programming language.  It
allows users to compile Python source code to Java byte codes, and run
the resulting bytecodes on any Java Virtual Machine. It is a very
seamless and smooth integration with Java: from Python you have complete
access to all Java libraries, can build applets, can integrate with Java
beans, and can subclass Java classes in Python and vice versa. Like
Python, and unlike Java, Jython can also be used interactively: just
type some Jython code at the prompt and see the results immediately.

A java installer is available for download at the Jython website:

    http://jython.sourceforge.net/

Installation is started by running the installer class. Further 
information and tips on installation is available at:

    http://jython.sourceforge.net/install.html

Jython 2.0 is feature compatible with Python 2.0 and among the 
new features are:

  - Augmented assignment, e.g. x += 1
  - List comprehensions, e.g. [x**2 for x in range(10)]
  - Extended import statement, e.g. import Module as Name
  - Extended print statement, e.g. print >> file, "Hello"

The changes from alpha 3 include:

  New features
    - Installer logo by Ivan Kougaenko. The logo competition is still 
      open, so submit you suggestions.
    - The default packages selected in the installer are now better
      attuned to the users (as opposed to the jython developers).

  Bug fixes.
    - Fixed a NPE when a class is defined in non-module namespace.
    - Fixed a compilation problem when using JDK1.2.x
    - The installer now creates a useable Uninstall.class.

A complete list of changes and differences are available here:

  http://jython.sourceforge.net/NEWS.html

Bugs can be reported to the bug manager on SourceForge:

  http://sourceforge.net/bugs/?group_id=12867

Cheers,
the jython-developers

Re: [Jython-users] Problems with xmllib

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

[L. Humbert]

>ok I'm working on Linux and on MacOS.
>I installed the latest jython 2.0a3 on both machines:
>
>Linux:
>Jython 2.0alpha3 on java1.2.2 (JIT: sunwjit) 
>MacOS:
>Jython 2.0alpha3 on java1.1.8 (JIT: MRJ22Jitc.01)
>
>A little project in training the presentation of some 
>xml-data which describe the layout of computer-infrastructure at work 
>(the first steps were done with Python2.0). My students didn't have the
>time to implement, so I gave it a try on jython:
>xmllib is part of the actual jython-distribution.
>
>Here begins my problem:
>on my linux-machine everything works fine.
>
>But after shifting the runable-source-code to the Mac I get some strange
>errors.
>After I found out that most of them could be eliminated, because I
>did'nt set the path in the right way,
>one serious error is still remaining:
>
>Error around line 505 of xmllib.py
>Ok, I gave it a try
>pure
>xmllib --> jython 2.0a3
>invalid syntax, line 508
>ok I decided to import xmllib at the command line
>sre_parse.py line 504
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Jython 2.0alpha3 on java1.1.8 (JIT: MRJ22Jitc.01)
>Type "copyright", "credits" or "license" for more information.
>>>> import xmllib
>Traceback (innermost last):
>  File "<console>", line 1, in ?
>  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/xmllib.py",
>line 5, in ?
>  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/re.py", line
>28, in ?
>  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/sre.py", line
>20, in ?
>  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/sre_parse.py",
>line 504
>SyntaxError: inconsistent dedent
>>>> 
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>As workaround, I set the sys.path so, that the Python2.0 Libs where
>used.
>The same effect appears.
>
>Perhaps there is someone out there, who is able to check it on a Mac,
>too.
>
>The problems doesn't arrive on my Linux-System.

I strongly suspect that there is a bug in the JVM for mac. Previously we
have seen other problems with the MRJ22 jvm:

  http://www.geocrawler.com/archives/3/7018/2000/10/0/4557089/

If anyone have a workaround for these problems, I would dearly love to
include it. Unfortunately I don't have a neither a Mac nor any knowledge
on how to use it.

regards,
finn

[Jython-users] Problems with xmllib

[L. H. <hu...@ha...>]

Hi,

ok I'm working on Linux and on MacOS.
I installed the latest jython 2.0a3 on both machines:

Linux:
Jython 2.0alpha3 on java1.2.2 (JIT: sunwjit) 
MacOS:
Jython 2.0alpha3 on java1.1.8 (JIT: MRJ22Jitc.01)

A little project in training the presentation of some 
xml-data which describe the layout of computer-infrastructure at work 
(the first steps were done with Python2.0). My students didn't have the
time to implement, so I gave it a try on jython:
xmllib is part of the actual jython-distribution.

Here begins my problem:
on my linux-machine everything works fine.

But after shifting the runable-source-code to the Mac I get some strange
errors.
After I found out that most of them could be eliminated, because I
did'nt set the path in the right way,
one serious error is still remaining:

Error around line 505 of xmllib.py
Ok, I gave it a try
pure
xmllib --> jython 2.0a3
invalid syntax, line 508
ok I decided to import xmllib at the command line
sre_parse.py line 504
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jython 2.0alpha3 on java1.1.8 (JIT: MRJ22Jitc.01)
Type "copyright", "credits" or "license" for more information.
>>> import xmllib
Traceback (innermost last):
  File "<console>", line 1, in ?
  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/xmllib.py",
line 5, in ?
  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/re.py", line
28, in ?
  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/sre.py", line
20, in ?
  File "/brecht/Systemordner/Preferences/jython-2.0a3/Lib/sre_parse.py",
line 504
SyntaxError: inconsistent dedent
>>> 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
As workaround, I set the sys.path so, that the Python2.0 Libs where
used.
The same effect appears.

Perhaps there is someone out there, who is able to check it on a Mac,
too.

The problems doesn't arrive on my Linux-System.

	TNX
	Ludger

[Jython-users] Installing Jython on the MacOS

[L. H. <hu...@ha...>]

Hi,

After installing I decided to document my process of installing Jython
on the MacOS.

Perhaps this information may find its place on: 
http://jython.sourceforge.net/platform.html

You can get the whole thing
Mac_OS_Jython_Inst.zip
334 K (342239 bytes)

at:
http://bscw.hagen.de/pub/german.cgi/0/565865

--> Jython

For working, I use several techniques:
one is PyPad
http://homepage.mac.com/ballabio/PyPad/


	TNX
	L. Humbert

[Jython-users] Re: [JPython] Third alpha release of Jython-2.0

[salvatore.didio <sal...@wa...>]

Hello Finn,

Thanks for your work
I don't file any jython class file in the package

Regards

Salvatore




----- Original Message -----
From: Finn Bock <bc...@wo...>
To: <jyt...@li...>
Cc: <jyt...@li...>;
<jyt...@li...>; <jpy...@py...>
Sent: Monday, December 25, 2000 8:11 PM
Subject: [JPython] Third alpha release of Jython-2.0


> Jython-2.0a3 is now available.
>
>   http://jython.sourceforge.net/index.html
>
> Install as with Jython-2.0a2. I don't intend to announce this any
> more widely than these lists for now.
>
> The release includes some bug fixes:
>
>   Bug fixes.
>     - Fixed a bug that caused Infinite recursion in subpackage
>       import
>     - Fixed conversion error when a long is converted to a java double.
>     - Fixed a bug where an attribute in a package __init__.py would
>       hide a submodule.
>     - Fixed missing quotes around the path to java.exe in jython.bat
>       for windows.
>     - Include missing re.py in installer.
>     - Added threading and atexit modules from CPython2.0.
>
>
> Take a look at the NEWS file for more information about the differences.
>
>   http://jython.sourceforge.net/NEWS.html
>
> Bugs can be reported to the bug manager on SourceForge:
>
>   http://sourceforge.net/bugs/?group_id=12867
>
> Cheers,
> the jython-developers
>
> _______________________________________________
> JPython-Interest maillist  -  JPy...@py...
> http://www.python.org/mailman/listinfo/jpython-interest

[Jython-users] Third alpha release of Jython-2.0

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

Jython-2.0a3 is now available. 

  http://jython.sourceforge.net/index.html

Install as with Jython-2.0a2. I don't intend to announce this any 
more widely than these lists for now.

The release includes some bug fixes:

  Bug fixes.
    - Fixed a bug that caused Infinite recursion in subpackage 
      import
    - Fixed conversion error when a long is converted to a java double.
    - Fixed a bug where an attribute in a package __init__.py would
      hide a submodule.
    - Fixed missing quotes around the path to java.exe in jython.bat 
      for windows.
    - Include missing re.py in installer.
    - Added threading and atexit modules from CPython2.0.


Take a look at the NEWS file for more information about the differences.

  http://jython.sourceforge.net/NEWS.html

Bugs can be reported to the bug manager on SourceForge:

  http://sourceforge.net/bugs/?group_id=12867

Cheers,
the jython-developers

Re: [Jython-users] RE: Jython + JSP pages ?

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

[Robert W. Bill]

>Also, is it known why the posted example crashes if I use
>"self.username" as an instance variable instead of the current
>"self.usrname"?  I'll have time next week to find out, just curious if ppl
>already knew so I could save some time.

It is because the getUsername / setUsername methods creates a bean
property called "username". Reading or writing to this beanproperty
(which is done in the set/get methods) will call the set/get methods
again.

The good news are that it is easy to work around (as you did) and you'll
recognize it immediately the next time it happen.

regards,
finn

Re: [Jython-users] RE: Jython + JSP pages ?

[Robert W. B. <rb...@di...>]

[Finn]
> I think that you have jython.jar included on your CLASSPATH before
> starting tomcat, correct?

Yes.

>  With tomcat 4.0m5 (the only one I have tested with) I had success with
> copying jython.jar to %TOMCAT_HOME%\webapps\jython\WEB-INF\lib. This way
> the deployment .war can be completely self contained.

Excellent!  Do you then use TOMCAT_OPTS to set python.home?  It seems
Jython reads the registry from wherever it finds the jython.jar if I
don't set python.home- I'm worried about what happens when a client has 2+
Jython webapps that are self-contained this way.  I'll have to try and
find out.

Also, is it known why the posted example crashes if I use
"self.username" as an instance variable instead of the current
"self.usrname"?  I'll have time next week to find out, just curious if ppl
already knew so I could save some time.


-Robert

Re: [Jython-users] RE: Jython + JSP pages ?

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

[Robert W. Bill]

>I've had progress with JSP and Jython and thought I would post
>some info for those that expressed interest.
>
>My previous posts noted difficulty in using jythonc compiled files with
>JSP on Windows.  However, the machine I was using had multiple JDK's
>installed.  Because of my troubles, I uninstalled all jdks and 
>re-installed only sun's 1.2.2 (out of convenience- I had the installer on
>the desktop), and all of the JSP problems that I was having are
>gone.  It's odd that other Java apps were working fine, and I was sure
>tomcat and jython/jythonc both pointed to the same jdk, but nonetheless
>this was a solution for me.

Good to hear that it worked out.

>A simple example of using Jythonc classes with tomcat is (using Tomcat
>3.2, jdk1.2.2_07, Win98):
>
>1. Make a context ("jython" in this example).
>
>2. compile following jython file with 
>"jythonc NameHandler.py" 
>(NOTE: changing the instance variable "usrname" to "username" is
>catastrophic- very interesting ;)
>
>--------------jython file: NameHandler.py----------------
>import java
>
>class NameHandler(java.lang.Object):
>    def __init__(self):
>        self.usrname = "Fred"
>    def getUsername(self):
>        "@sig public String getname()"
>        return self.usrname
>    def setUsername(self, name):
>        "@sig public void setname(java.lang.String name)"
>        self.usrname = name
>----------------------------------------------------------
>
>3. Copy NameHandler.class & NameHandler$_PyInner.class to
>\%TOMCAT_HOME%\webapps\jython\WEB-INF\classes
>
>4. Make test.jsp file from below
>
>--------------jsp file: test.jsp--------------------------
><%@ page import = "mytest" %>
>
><html>
><head><title>hello</title></head>
><body bgcolor="white">
>Hello, my name is
><% NameHandler nh = new NameHandler(); %>
><%= nh.getUsername() %> <br>
>No! wait...
><% nh.setUsername("Robert"); %>
>,  It's really <%= nh.getUsername() %>.
>
></font>
></body>
></html>
>-----------------------------------------------------------
>
>5. Place test.jsp file in
>context (ie- "\%TOMCAT_HOME\webapps\jython\jsp\test.jsp")
>
>Restart Tomcat and visit
>"http://localhost:8080/jython/jsp/test.jsp".  This
>is it.

I think that you have jython.jar included on your CLASSPATH before
starting tomcat, correct?

With tomcat 4.0m5 (the only one I have tested with) I had success with
copying jython.jar to %TOMCAT_HOME%\webapps\jython\WEB-INF\lib. This way
the deployment .war can be completely self contained.

regards,
finn

[Jython-users] RE: Jython + JSP pages ?

[Robert W. B. <rb...@di...>]

Hello all,

I've had progress with JSP and Jython and thought I would post
some info for those that expressed interest.

My previous posts noted difficulty in using jythonc compiled files with
JSP on Windows.  However, the machine I was using had multiple JDK's
installed.  Because of my troubles, I uninstalled all jdks and 
re-installed only sun's 1.2.2 (out of convenience- I had the installer on
the desktop), and all of the JSP problems that I was having are
gone.  It's odd that other Java apps were working fine, and I was sure
tomcat and jython/jythonc both pointed to the same jdk, but nonetheless
this was a solution for me.

A simple example of using Jythonc classes with tomcat is (using Tomcat
3.2, jdk1.2.2_07, Win98):

1. Make a context ("jython" in this example).

2. compile following jython file with 
"jythonc NameHandler.py" 
(NOTE: changing the instance variable "usrname" to "username" is
catastrophic- very interesting ;)

--------------jython file: NameHandler.py----------------
import java

class NameHandler(java.lang.Object):
    def __init__(self):
        self.usrname = "Fred"
    def getUsername(self):
        "@sig public String getname()"
        return self.usrname
    def setUsername(self, name):
        "@sig public void setname(java.lang.String name)"
        self.usrname = name
----------------------------------------------------------

3. Copy NameHandler.class & NameHandler$_PyInner.class to
\%TOMCAT_HOME%\webapps\jython\WEB-INF\classes

4. Make test.jsp file from below

--------------jsp file: test.jsp--------------------------
<%@ page import = "mytest" %>

<html>
<head><title>hello</title></head>
<body bgcolor="white">
Hello, my name is
<% NameHandler nh = new NameHandler(); %>
<%= nh.getUsername() %> <br>
No! wait...
<% nh.setUsername("Robert"); %>
,  It's really <%= nh.getUsername() %>.

</font>
</body>
</html>
-----------------------------------------------------------

5. Place test.jsp file in
context (ie- "\%TOMCAT_HOME\webapps\jython\jsp\test.jsp")

Restart Tomcat and visit
"http://localhost:8080/jython/jsp/test.jsp".  This
is it.

Using jythonc compiled files, importing org.python.util.PythonInterpreter
directly in the jsp, and writing java classes/beans that import
PythonInterpreter have now all worked well for me with JSP.
 
My next step is a snappy jython memento for persistence- maybe even
setting python.security.respectJavaAccessibility = false
to see what things can be done then.  All hints welcome.

-Robert

[Jython-users] Re: Jython + JSP pages ?

[Robert W. B. <rb...@di...>]

Hello all,

This was originally on the jython-dev list, but I thought it might be more
appropriate here...

[Ray]
> On Thu, 21 Dec 2000, Ray Leyva wrote:
> > Just wondering. Cause we're building a site based solely on Java, and
> > JSP.  I was wondering if it was possible to use Jython from with JSP,
> > and if so can someone send a really really simple ( rudimentary )
> > FooBar, World! style sample.
> > 
> > thx
> > rl
[Me]
> I'm been looking at this as well.  So far, I'm unable to use a jythonc
> compiled file with Tomcat jsp due to a StackOverflow in __init__ or other 
> problems loading the inner class. I think I'm missing something though.

I've come to a point where I need to ask people what it is I'm missing.

The dilemna is the use of jythonc generated classes in JSP pages.  For
example, I can have a jython class and .jsp page as follows (roughly from
Frank Chen's original examples):

-------------file:  mytest.py---------------------
import java
class mytest(java.lang.Object):
    def __init__(self):
	self.name =  "Jerry"
   def myget(self):
	"@sig  public String myget()"
	return self.name
    def myset(self, name):
	"@sig public void myset(java.lang.String name)"
	self.name = name
----------------------------------------------------
This is compiled with "jythonc mytest.py".

------------file: test.jsp-------------------
<%@ page import = "mytest" %>
<html>
<head><title>Jython  Test</title></head>
<body bgcolor="white">
<% mytest  mt = new  mytest(); %>
My name is <%= mt.myget() %>
<% mt.myset("Robert"); %>
<br>No, wait, it's <%= mt.myget() %>
</font></body></html>
-----------------------------------------------

I have never gotten the jythonc compiled file to work, but until today my 
JSP work was stuck on a win98 machine.  Today, I find out that any of
my jythonc compiled files work fine on my linux and Solaris boxes.  It
is as simple as write anything in jython, compile with jythonc and use
the <%@ page import = "filename" %> to use it in JSP, with the above
example being just the tip of the iceburg.

On win98 I still receive a StackOverflow.  I have edited the memory
properties of the dos .lnk that I use to start tomcat on Windows, and
have been through all possible permutations of settings as well as
eliminating any backgrounded processes (I think called TSR's on
windows?).  I still cannot avoid the StackOverflow when Jasper loads the
requested jythonc compiled file.

All boxes are using Sun jdk1.3, jython-2.0a2, and have 64mb ram.

I was hoping that someone who understands windows (not me) could help
provide some hints on getting it working.  Was editing the .lnk memory
properties a likely answer?  My memory monitor does not show memory
totally full- can I adjust the stack size java uses?  Am I looking
entirely in the wrong direction by focussing on memory allocation?  All
classloaders are the same (Jasper/tomcat/sunjdk1.3) so it's not likely
jvm/servlet-container.  I do not have any additional windows machines to
test this on to see if it would be a setup problem on one
machine.

My sincere thanks in advance for any suggestions.

-Robert

Re: [Jython-users] long/double conversion

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

[Barry Haddow]

>Is the following behaviour correct?
>
>Jython 2.0alpha1 on java1.2.2 (JIT: javacomp)
>Type "copyright", "credits" or "license" for more information.
>>>> from time import *
>>>> secs =  977232600L
>>>> ctime(secs)
>Traceback (innermost last):
>  File "<console>", line 1, in ?
>TypeError: ctime(): 1st arg can't be coerced to double
>>>> ctime(float(secs))
>'Tue Dec 19 13:30:00 2000'

No, it is a bug. I just checked in a patch.

Thanks for the bug report.

regards,
finn

[Jython-users] long/double conversion

[Barry H. <b.h...@sc...>]

Hi

Is the following behaviour correct?

Jython 2.0alpha1 on java1.2.2 (JIT: javacomp)
Type "copyright", "credits" or "license" for more information.
>>> from time import *
>>> secs =  977232600L
>>> ctime(secs)
Traceback (innermost last):
  File "<console>", line 1, in ?
TypeError: ctime(): 1st arg can't be coerced to double
>>> ctime(float(secs))
'Tue Dec 19 13:30:00 2000'
>>> 

In cpython it works without the cast:

Python 1.5.2 (#9, Feb  7 2000, 00:10:53)  [GCC 2.95.1 19990816 (release)] on linux2
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> from time import *
>>> secs = 977232600L
>>> ctime(secs)
'Tue Dec 19 13:30:00 2000'
>>> 


cheers
Barry

Re: [Jython-users] fail to import cgi.py with alpha2

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

[Brian Zimmer]

>This is a multi-part message in MIME format.
>
>------_=_NextPart_001_01C06920.5186FCDF
>Content-Type: text/plain;
>	charset="iso-8859-1"
>Content-Transfer-Encoding: quoted-printable
>
>I am using the latest CVS code and can no longer import the CPython 2.0
>cgi module:
>
>D:\>jython
>Listening for transport dt_socket at address: 3540
>Jython 2.0alpha2 on java1.3.0 (JIT: null)
>Type "copyright", "credits" or "license" for more information.
>>>> import cgi
>internal compiler error: Name:s1 at line 195

Obviously a bug. It occur because a more stringent fast-locals algorithm
was added in a2 (this fix a bug when "exec" staments assign to a local
and make jython more CPython compatible). The new algorithmt assume that
all locals have been detected correctly where the a1 would use a slower
string based local lookup when in doubt.

The trigger is the local assignments in list comprehension that wasn't
detected correctly. "s1" and "s2" and locals in defining block:

    pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]

A patch have now been checked into CVS.

regards,
finn

[Jython-users] fail to import cgi.py with alpha2

[Brian Z. <bz...@ig...>]

I am using the latest CVS code and can no longer import the CPython 2.0
cgi module:

D:\>jython
Listening for transport dt_socket at address: 3540
Jython 2.0alpha2 on java1.3.0 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> import cgi
internal compiler error: Name:s1 at line 195
Traceback (innermost last):
  File "<console>", line 1, in ?
java.lang.NullPointerException
        at org.python.compiler.CodeCompiler.Name(CodeCompiler.java:2237)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:326)
        at org.python.compiler.CodeCompiler.set(CodeCompiler.java:110)
        at
org.python.compiler.CodeCompiler.for_stmt(CodeCompiler.java:884)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:224)
        at
org.python.compiler.CodeCompiler.list_comprehension(CodeCompiler.java:19
50)
        at org.python.compiler.CodeCompiler.list(CodeCompiler.java:1906)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:296)
        at
org.python.compiler.CodeCompiler.expr_stmt(CodeCompiler.java:352)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:190)
        at
org.python.compiler.CodeCompiler.suite(CodeCompiler.java:1116)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:230)
        at org.python.compiler.CodeCompiler.parse(CodeCompiler.java:185)
        at org.python.compiler.Module.PyCode(Module.java:370)
        at
org.python.compiler.CodeCompiler.funcdef(CodeCompiler.java:324)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:178)
        at
org.python.compiler.CodeCompiler.suite(CodeCompiler.java:1116)
        at
org.python.compiler.CodeCompiler.file_input(CodeCompiler.java:240)
        at org.python.parser.SimpleNode.visit(SimpleNode.java:174)
        at org.python.compiler.CodeCompiler.parse(CodeCompiler.java:185)
        at org.python.compiler.Module.PyCode(Module.java:370)
        at org.python.compiler.Module.compile(Module.java:506)
        at org.python.core.imp.compileSource(imp.java:119)
        at org.python.core.imp.compileSource(imp.java:102)
        at org.python.core.imp.createFromSource(imp.java:142)
        at org.python.core.imp.loadFromPath(imp.java:316)
        at org.python.core.imp.loadFromPath(imp.java:252)
        at org.python.core.imp.load(imp.java:357)
        at org.python.core.imp.load(imp.java:376)
        at org.python.core.imp.importName(imp.java:446)
        at org.python.core.imp.importName(imp.java:508)
        at org.python.core.ImportFunction.load(__builtin__.java:962)
        at org.python.core.ImportFunction.__call__(__builtin__.java:956)
        at org.python.core.PyObject.__call__(PyObject.java:250)
        at org.python.core.__builtin__.__import__(__builtin__.java:916)
        at org.python.core.imp.importOne(imp.java:517)
        at org.python.pycode._pyx1.f$0(<console>)
        at org.python.pycode._pyx1.call_function(<console>)
        at org.python.core.PyTableCode.call(PyTableCode.java:155)
        at org.python.core.Py.runCode(Py.java:1050)
        at org.python.core.Py.exec(Py.java:1064)
        at
org.python.util.PythonInterpreter.exec(PythonInterpreter.java:124)
        at
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.ja
va:87)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.
java:68)
        at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.
java:42)
        at
org.python.util.InteractiveConsole.push(InteractiveConsole.java:83)
        at
org.python.util.InteractiveConsole.interact(InteractiveConsole.java:62)
        at org.python.util.jython.main(jython.java:178)

java.lang.NullPointerException: java.lang.NullPointerException
>>>

This worked with alpha1 on Windows 2000, jdk1.3

thanks,

brian

[Jython-users] Second alpha release of Jython-2.0

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

Jython-2.0a2 is now available. 

  http://jython.sourceforge.net/index.html

Install as with Jython-2.0a1. I don't intend to announce this any 
more widely than these lists for now.

The release includes some bug fixes as well as a few but crucial 
new features.

  New features:
    - Added -v (verbose) option to jython command. It will trace
      import statements. Use three -v's for maximum information.
    - A redesigned of the internal java class handling. The new
      design allow for a pluggable javaclass -> PyJavaClass handling.
      Included are plugins that use weak or soft references.
    - Use a SecureClassLoader for loading compiled python modules.
      This should allow jython to be used with the java plugin and
      its fine grained security.

  CPython-2.0 compatibility
    - Added support for formatting of long values in "%d %x %X %o".
      The support does not match CPython2.0 exactly, but matches
      what CPython2.1 will do.
    - The \x escape will only eat two hex characters and will 
      always create a character with values < 256. Use the \u
      escape for high-byte values.
    - A ucnhash module to support the \N{name} escape.


Take a look at the NEWS file for more information about the differences.

  http://jython.sourceforge.net/NEWS.html

Bugs can be reported to the bug manager on SourceForge:

  http://sourceforge.net/bugs/?group_id=12867

Cheers,
the jython-developers

Fw: [Jython-users] jsp

[Frank C. <fr...@ms...>]

Ah! I was wrong again!

I put test.py in a wrong place. Nothing wrong! Sorry for these things!

> > 
> 
> So, how can I use execfile() method?
> 
> PythonInterpreter interp = new PythonInterpreter();
> ........
> interp.execfile("test.py");
> 
> I cannot run it in the JSP framework, but it is normal in ordinary Java
> code.
> 
> Frank chen
> 

Re: [Jython-users] jsp

[Frank C. <fr...@ms...>]

> I didn't mean to import the PythonInterpreter in the JSP code.  I
> actually was thinking about instances (no pun intended) where
> writing a java class that imports PythonInterpreter acts as the
> proxy for python files.  In this case, import the java class in
> the JSP, initialize PythonInterpreter in the java class, then use
> the java class's interfaces to get at your python files.
> 

So, how can I use execfile() method?

PythonInterpreter interp = new PythonInterpreter();
.......
interp.execfile("test.py");

I cannot run it in the JSP framework, but it is normal in ordinary Java
code.

Frank chen