jython-users — Discussion of and questions about using Jython

Re: [Jython-users] GUI for Jython

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

OK, this got me thinking _way_ too much about this.

Here is a modification to python-mode.el (v. 4.6) that auto-detects the interpreter based on:

- #! line  (a la 'get-auto-mode')
- import of java/javax/org/com packages (these imply jpython)
- default to cpython (not py-default-interpreter, because the imports test can only detect jpython)

It works really well for me.

Anyway, here's the patch.  Anyone willing to try this and give feedback?  After hearing from you I'll submit it  to the sourceforge project...

I also put the modified python-mode.el file up on:

  http://www.xmission.com/~butler/python-mode.el

kb



diff -c python-mode.el python-mode.el.4.6
*** python-mode.el	Wed Jan 23 17:31:31 2002
--- python-mode.el.4.6	Wed Jan 23 17:31:28 2002
***************
*** 275,293 ****
    :type 'string
    :group 'python)
  
- (defcustom py-choose-bound
-   20000
-   "Max characters to search in trying to choode `python-mode'."
-   :type 'integer
-   :group 'python
-   )
- 
- (defcustom py-jpython-packages
-   '("java" "javax" "org" "com")
-   "Imported packages that imply `jpython-mode'."
-   :type '(repeat string)
-   :group 'python)
-   
  ;; Not customizable
  (defvar py-master-file nil
    "If non-nil, execute the named file instead of the buffer's file.
--- 275,280 ----
***************
*** 304,315 ****
  buffer is prepended to come up with a file name.")
  (make-variable-buffer-local 'py-master-file)
  
- (defvar py-shell-alist
-   '(("jpython" . 'jpython)
-     ("jython" . 'jpython)
-     ("python" . 'cpython))
-   "*Alist of interpreters and python shells. Used by `py-choose-shell'
- to select the appropriate python interpreter mode for a file.")
  
  
  ;; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--- 291,296 ----
***************
*** 466,480 ****
  
  (defvar python-mode-hook nil
    "*Hook called by `python-mode'.")
  ;; In previous version of python-mode.el, the hook was incorrectly
  ;; called py-mode-hook, and was not defvar'd.  Deprecate its use.
  (and (fboundp 'make-obsolete-variable)
       (make-obsolete-variable 'py-mode-hook 'python-mode-hook))
  
- (defvar jpython-mode-hook nil
-   "*Hook called by `jpython-mode'. `jpython-mode' also calls
- `python-mode-hook'.")
- 
  (defvar py-mode-map ()
    "Keymap used in `python-mode' buffers.")
  (if py-mode-map
--- 447,458 ----
  
  (defvar python-mode-hook nil
    "*Hook called by `python-mode'.")
+ 
  ;; In previous version of python-mode.el, the hook was incorrectly
  ;; called py-mode-hook, and was not defvar'd.  Deprecate its use.
  (and (fboundp 'make-obsolete-variable)
       (make-obsolete-variable 'py-mode-hook 'python-mode-hook))
  
  (defvar py-mode-map ()
    "Keymap used in `python-mode' buffers.")
  (if py-mode-map
***************
*** 936,1012 ****
  				    (point-max) 'move))))
      (nreverse index-alist)))
  
- ;; let emacs auto-detect the j/python interpreter based on the #!... line
- (setq interpreter-mode-alist
-       (append interpreter-mode-alist '(("jpython" . jpython-mode)
- 				       ("jython" . jpython-mode)
- 				       ("python" . python-mode))))
- 
- 
- 
- (defun jpython-mode ()
-   "Major mode for editing JPython/Jython files.
- This is a simple wrapper around `python-mode'.
- It runs `jpython-mode-hook' then calls `python-mode.'
- It is added to `interpreter-mode-alist' and `py-choose-shell'.
- "
-   (interactive)
-   (py-toggle-shells 'jpython)
-   (when jpython-mode-hook
-       (run-hooks 'jpython-mode-hook))
-   (python-mode)
-   )
- 
- 
- (defun py-choose-shell-by-shebang ()
-   "Choose CPython or JPython mode by looking at #! on the first line.
- Returns the appropriate mode function.
- Used by `py-choose-shell', and similar to but distinct from
- `set-auto-mode', though it uses `auto-mode-interpreter-regexp'."
-   ;; look for an interpreter specified in the first line
-   ;; similar to set-auto-mode (files.el)
-   (let ((interpreter
- 	 (save-excursion
- 	   (goto-char (point-min))
- 	   (if (looking-at auto-mode-interpreter-regexp)
- 	       (match-string 2)
- 	     ""))))
-     ;; Map interpreter name to a mode.
-     (setq elt (assoc (file-name-nondirectory interpreter)
- 		     py-shell-alist))
-     (if elt (caddr elt))))
- 
- 
- (defun py-choose-shell-by-import ()
-   "Choose CPython or JPython mode based imports.
- If a file imports any packages in `py-jpython-packages', return
- 'jpython, otherwise return nil."
-   (let ((mode nil))
-     (save-excursion
-       (goto-char (point-min))
-       (while (and (not mode)
- 		  (search-forward-regexp
- 		   "^\\(\\(from\\)\\|\\(import\\)\\) \\([^ \t\n.]+\\)"
- 		   py-choose-bound t))
- 	(setq mode (and (member (match-string 4) py-jpython-packages)
- 			 'jpython
- 			 ))))
-     mode))
- 
- 
- (defun py-choose-shell ()
-   "Choose CPython or JPython mode. Returns the appropriate mode function.
- This does the following:
-  - look for an interpreter with `py-choose-shell-by-shebang'
-  - examine imports using `py-choose-shell-by-import'
-  - default to py-default-interpreter"
-   (interactive)
-   (or (py-choose-shell-by-shebang)
-       (py-choose-shell-by-import)
-       'cpython ;; don't use to py-default-interpreter, because default
-                ;; is only way to choose CPython
-       ))
- 
  
  ;;;###autoload
  (defun python-mode ()
--- 914,919 ----
***************
*** 1097,1103 ****
        ))
    ;; Set the default shell if not already set
    (when (null py-which-shell)
!     (py-toggle-shells (py-choose-shell)))
    )
  
  
--- 1004,1010 ----
        ))
    ;; Set the default shell if not already set
    (when (null py-which-shell)
!     (py-toggle-shells py-default-interpreter))
    )
  
  




Jon K Hellan wrote:
> 
> Syver Enstad <syv...@on...> writes:
> 
> > For another solution, (what I do):
> > put the following in the first line of a jython script:
> > ## -*- mode: python; eval: (py-toggle-shells 'jpython); -*-1
> >
> > Since I run Cpython mostly but do a fair bit of hacking with jython
> > at the time being.
> 
> Here's what I do:
> 
> (add-hook
>  'python-mode-hook
>  (lambda ()
>    (let ((using-jython
>           (save-excursion
>             (goto-char (point-min))
>                           (looking-at "#!.*\\(java\\|jp?ython\\)"))))
>      (py-toggle-shells (if using-jython 'jpython 'cpython)))))
> 
> This looks at the #! line at the top of the script and selects the
> appropriate interpreter.

I like that.

I'd probably extend it so it recognizes imports of java-specific packages, too:

(add-hook
 'python-mode-hook
 (lambda ()
   (let ((using-jython
          (save-excursion
            (goto-char (point-min))
            (or
	     (looking-at "#!.*\\(java\\|jp?ython\\)")
	     (looking-at "import java")))))
	 (py-toggle-shells (if using-jython 'jpython 'cpython)))))

Re: [Jython-users] How do I process a shell command and grab stdout for text processing?

[Syver E. <syv...@on...>]

Syver Enstad <syv...@on...> writes:
> Here's a quick hack os.popen, it only works for reading at the time, 
> but would be easy to fix I believe.
> 
> def popen(path, mode='r'):
>     r = java.lang.Runtime.getRuntime()
>     p = r.exec(path)
>     if mode == 'w':
>         return org.python.core.PyFile(p.getInputStream())
>     elif mode == 'r':
>         return org.python.core.PyFile(p.getOutputStream())
>     else:
>         raise OSError(0, "Invalid mode", mode)

the only trouble I have so far is that the right ctor for PyFile
doesn't seem to be because, the PyFile returned is always a PyFile in
read mode, even though PyFile has one ctor for java.io.InputStream and
one for java.io.OutputStream.
 

-- 

Vennlig hilsen 

Syver Enstad

Re: [Jython-users] How do I process a shell command and grab stdout for text processing?

[Syver E. <syv...@on...>]

Ganesan R <rga...@my...> writes:

Here's a quick hack os.popen, it only works for reading at the time, 
but would be easy to fix I believe.

def popen(path, mode='r'):
    r = java.lang.Runtime.getRuntime()
    p = r.exec(path)
    if mode == 'w':
        return org.python.core.PyFile(p.getInputStream())
    elif mode == 'r':
        return org.python.core.PyFile(p.getOutputStream())
    else:
        raise OSError(0, "Invalid mode", mode)

-- 

Vennlig hilsen 

Syver Enstad

[Jython-users] RE: How do I process a shell command and grab stdout

[<da...@cr...>]

Jim,

Have you tried using the java.lang.Runtime.exec() methods from within jython? Sounds like they will do everything you need, although I haven't used them in anger myself.

Dave

>I need to execute commands on AIX, parse the output, and ...
>as a Java Bean.  Since I am brand new to Python, I anxiously imported os and
>tried to execute os.popen('command') and grab the output stream.  However,
>popen has not yet been implemented in jython!  Given that big let down, does
>anyone know how in the world can I execute a shell command and process the
>resulting output stream from jython?  Thanks in advance for your help!
>
>Jim Boone

Re: [Jython-users] orb.properties problems

[Ted M. <mcf...@ds...>]

Hi,

In the past, I have used jython with OOC/IONA's ORBacus for Java,
which worked great so I would expect you should be able to get jacorb
running as well.

I vaguely recall setting the org.omg.CORBA.ORBClass and
org.omg.CORBA.ORBSingletonClass values to the ooc classes on the
command line and not using orb.properties.

The search order for the orb class values is (as from the jdk docs):
1. check in Applet parameter or application string array, if any
2. check in properties parameter, if any
3. check in the System properties
4. check in the orb.properties file located in the user.home dir (if any)
5. check in the orb.properties file located in the java.home/lib dir (if any)
6. fall back on a hardcoded default behavior (use the Java IDL impl)

Any chance you have a stray or mislocated orb.properties file?

Cheers,

Ted

On Wed, Jan 23, 2002 at 08:30:27PM -0600, Joshua Reynolds wrote:
> Has anyone tried using a different CORBA ORB with jython.  I am tring to 
> use jython to debug some of my java code (which uses jacorb) and it 
> doesn't seem to be using the orb.properties file. The java interpreter 
> works fine when run in isolation.
> 
> Any suggestions.
> -- 
> Joshua Reynolds | IT
> 
> Isogen International
> Office: 512-380-0347
> Cell:   512-743-3865
> 1016 La Posada Suite 240
> Austin, TX 78752
> 
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

-- 
Ted McFadden 
mcf...@ds... +61 7 3365-4310 <http://www.dstc.edu.au/m3>
CRC for Enterprise Distributed Systems Technology DSTC Pty Ltd
Level 7 GP South - The University of Queensland, Brisbane 4072 Australia

RE: [Jython-users] How do I process a shell command and grab stdout for text processing?

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

> 
> This was a big let down for me too. I saw a module called 
> jnios but that doesn't seem to be maintained any more. I 
> searched google for the reason and figured out that the 
> reason for this is because Java does not support pipes. 
> Wouldn't it be possible to emulate popen with 
> Process.getRunTime().exec()? I guess there's a good reason 
> why that's not done yet; I'd like to know the reason :-).
> 

The primary reason is because no one has gotten around to it.  Ant, the
Java equivalent of make, does an adequate job of capturing output so I'd
think Jython could too.  I've threatened to write it a couple of times
but I either run out of time or work on something more pressing.

thanks,

brian

Re: [Jython-users] How do I process a shell command and grab stdout for text processing?

[Ganesan R <rga...@my...>]

>>>>> "jim" == jim boone <jim...@ba...> writes:

> I need to execute commands on AIX, parse the output, and package the results
> as a Java Bean.  Since I am brand new to Python, I anxiously imported os and
> tried to execute os.popen('command') and grab the output stream.  However,
> popen has not yet been implemented in jython!  Given that big let down, does
> anyone know how in the world can I execute a shell command and process the
> resulting output stream from jython?  Thanks in advance for your help!

This was a big let down for me too. I saw a module called jnios but that
doesn't seem to be maintained any more. I searched google for the reason and
figured out that the reason for this is because Java does not support
pipes. Wouldn't it be possible to emulate popen with
Process.getRunTime().exec()? I guess there's a good reason why that's not
done yet; I'd like to know the reason :-).

Ganesan

Re: [Jython-users] GUI for Jython

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

On Thu, Jan 24, 2002 at 12:45:12AM +0100, Syver Enstad wrote:
| Jon K Hellan <he...@ac...> writes:
| > Here's what I do:
| > 
| > (add-hook 
| >  'python-mode-hook 
| >  (lambda ()
| >    (let ((using-jython
| >           (save-excursion 
| >             (goto-char (point-min))
| >                           (looking-at "#!.*\\(java\\|jp?ython\\)"))))
| >      (py-toggle-shells (if using-jython 'jpython 'cpython)))))
| > 
| > 
| > This looks at the #! line at the top of the script and selects the
| > appropriate interpreter.
| 
| Cool, that should be in python-mode.el I suppose. Unfortunately I
| can't use that trick as I don't use unix.

Sure you can -- the '#' makes it a comment as far as python is
concerned; it doesn't matter that your shell ignores it too.

-D

-- 

The light of the righteous shines brightly,
but the lamp of the wicked is snuffed out.
        Proverbs 13:9

[Jython-users] orb.properties problems

[Joshua R. <jo...@is...>]

Has anyone tried using a different CORBA ORB with jython.  I am tring to 
use jython to debug some of my java code (which uses jacorb) and it 
doesn't seem to be using the orb.properties file. The java interpreter 
works fine when run in isolation.

Any suggestions.
-- 
Joshua Reynolds | IT

Isogen International
Office: 512-380-0347
Cell:   512-743-3865
1016 La Posada Suite 240
Austin, TX 78752

Re: [Jython-users] GUI for Jython

[Syver E. <syv...@on...>]

Jon K Hellan <he...@ac...> writes:
> Here's what I do:
> 
> (add-hook 
>  'python-mode-hook 
>  (lambda ()
>    (let ((using-jython
>           (save-excursion 
>             (goto-char (point-min))
>                           (looking-at "#!.*\\(java\\|jp?ython\\)"))))
>      (py-toggle-shells (if using-jython 'jpython 'cpython)))))
> 
> 
> This looks at the #! line at the top of the script and selects the
> appropriate interpreter.

Cool, that should be in python-mode.el I suppose. Unfortunately I
can't use that trick as I don't use unix.
 

-- 

Vennlig hilsen 

Syver Enstad

[Jython-users] How do I process a shell command and grab stdout for text processing?

[<jim...@ba...>]

Hi,

I recently began to explore using jython to handle many of the nasty text
processing tasks that I need to do in my Java programs.  Jython looked like
the answer to my prayers until I tried to apply it to my problem   I hope
someone can point me in the right direction.

I need to execute commands on AIX, parse the output, and package the results
as a Java Bean.  Since I am brand new to Python, I anxiously imported os and
tried to execute os.popen('command') and grab the output stream.  However,
popen has not yet been implemented in jython!  Given that big let down, does
anyone know how in the world can I execute a shell command and process the
resulting output stream from jython?  Thanks in advance for your help!

Jim Boone

[Jython-users] jreload issue

[<Mat...@i2...>]

Shouldn't the following be equivalent?  I can't seem to get the jreload 
version to work.

start jython with some.jar in cp, then:

from org import somepackage

OR start jython with no classpath:

import jreload
ls = jreload.makeLoadSet('myls', ["/path/to/some.jar"])
from myls import org
from org import somepackage
ImportError: cannot import name somepackage


The goal here is to have a script  be able to use the same import lines, 
regardless of wether its being called from the command line using the 
correct classpath, or from another script which sets up its 
classpath/namespace via jreload.

Matt

Re: [Jython-users] GUI for Jython

[Jon K H. <he...@ac...>]

Syver Enstad <syv...@on...> writes:

> For another solution, (what I do):
> put the following in the first line of a jython script:
> ## -*- mode: python; eval: (py-toggle-shells 'jpython); -*-1
> 
> Since I run Cpython mostly but do a fair bit of hacking with jython
> at the time being.

Here's what I do:

(add-hook 
 'python-mode-hook 
 (lambda ()
   (let ((using-jython
          (save-excursion 
            (goto-char (point-min))
                          (looking-at "#!.*\\(java\\|jp?ython\\)"))))
     (py-toggle-shells (if using-jython 'jpython 'cpython)))))


This looks at the #! line at the top of the script and selects the
appropriate interpreter.

Jon Kåre

Re: [Jython-users] GUI for Jython

[Syver E. <syv...@on...>]

Kevin Butler <kb...@ca...> writes:

> You need to customize the a couple of variables:
> 
> (setq py-default-interpreter 'jpython)
> (setq py-jpython-command "jython")
> 
> You can also toggle between the two shells via C-c C-t
>      (py-toggle-shells)

For another solution, (what I do):
put the following in the first line of a jython script:
## -*- mode: python; eval: (py-toggle-shells 'jpython); -*-1

Since I run Cpython mostly but do a fair bit of hacking with jython
at the time being.


-- 

Vennlig hilsen 

Syver Enstad

Re: [Jython-users] GUI for Jython

[Edward P. <epo...@te...>]

I use http://www.jedit.org, along with some python helper plugins.

-Ed
  ----- Original Message ----- 
  From: Anderson Zhang 
  To: jyt...@li... 
  Sent: Monday, January 21, 2002 6:17 PM
  Subject: [Jython-users] GUI for Jython


  Dear All,

  is there any wonderful GUI for Jython?The console window is stupid.I am tired of it.

  Thanks,
  Anderson.

Re: [Jython-users] GUI for Jython

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

On Tuesday 22 January 2002 04:17, Anderson Zhang wrote:
> Dear All,
> 
> is there any wonderful GUI for Jython?The console window is stupid.I am
> tired of it.
 
> Thanks,
> Anderson.
Hi I can recommend using jEdit http://www.jedit.org with the Jython Plugin, 
the editor gives excellent features and the plugin allows things like 
running/importing the current buffer

Re: [Jython-users] GUI for Jython

[Mats W. <ma...@la...>]

At 10:17 AM 1/22/2002 +0800, Anderson Zhang wrote:
>Dear All,
>
>is there any wonderful GUI for Jython?The console window is stupid.I am 
>tired of it.


The current development version of IDLE (idlefork) should
concpetually be usuable for Jython.  I don't know if anybody
has actually tried to make it work; I was once planning to
try when the support for executing code in a separate
process from the one running IDLE itself went in, but I've
not even come remotely close to having the time and there
may be (many?) additional issues I haven't thought of.

Re: [Jython-users] GUI for Jython

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

You need to customize the a couple of variables:

(setq py-default-interpreter 'jpython)
(setq py-jpython-command "jython")

You can also toggle between the two shells via C-c C-t (py-toggle-shells)

kb

Don Coleman wrote:
> 
> > Personally, I run Jython from python-mode in emacs constantly.
> > Easy re-execute of chunks of/whole files, great command-line editing &
> history.
> 
> How do you set emacs to use Jython for "Execute Buffer C-c C-c" instead of
> Python?
> 
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users

Re: [Jython-users] GUI for Jython

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

On Tue, Jan 22, 2002 at 10:17:48AM +0800, Anderson Zhang wrote:
| Dear All,
| 
| is there any wonderful GUI for Jython?  The console window is
| stupid.  I am tired of it.

There's Swing.

Are you looking for an Integrated Development Environment instead?
I've found that vim+bash+<all other unix utilities> is the best
environment possible.  (yes I see that you're using MS Lookout.
that's no excuse though; cygwin is as excellent a system as can be,
given the underlying platform)

-D

-- 

Reckless words pierce like a sword,
but the tongue of the wise brings healing.
        Proverbs 12:18

Re: [Jython-users] unintelligible messages

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

On Tue, Jan 22, 2002 at 01:39:21PM +0100, Erik Forsberg wrote:
| dman <ds...@ri...> writes:
| 
| > Everyone on the list gets these.  They are HTML formatted spam in a
| > Korean charset (ks_NNNN_NNNN, I don't recall what digits the 'N' are).
| 
| Why isn't the list closed for posts by others than list members? That
| stops a lot of spam since most spammers won't subscribe to the list.

That just makes it a pain for some legit posters too.  (I don't know
the real reason behind the decision for this list, that's just my
$0.02)  spamassassin is great at catching junk like that anyways.

-D

-- 

Windows, hmmm, does it come with a GUI interface that works or just
pretty blue screens?

RE: [Jython-users] GUI for Jython

[Don C. <dco...@sc...>]

> Personally, I run Jython from python-mode in emacs constantly.
> Easy re-execute of chunks of/whole files, great command-line editing &
history.

How do you set emacs to use Jython for "Execute Buffer C-c C-c" instead of
Python?

Re: [Jython-users] GUI for Jython

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

> Anderson Zhang wrote:
> 
> is there any wonderful GUI for Jython?The console window is stupid.I am tired of it.

Personally, I run Jython from python-mode in emacs constantly.

Easy re-execute of chunks of/whole files, great command-line editing & history.

Very nice environment.  :-)

kb

Re: [Jython-users] unintelligible messages

[Erik F. <for...@ce...>]

dman <ds...@ri...> writes:

> Everyone on the list gets these.  They are HTML formatted spam in a
> Korean charset (ks_NNNN_NNNN, I don't recall what digits the 'N' are).

Why isn't the list closed for posts by others than list members? That
stops a lot of spam since most spammers won't subscribe to the list.

\EF
-- 
Erik Forsberg, Cendio Systems AB. 

[Jython-users] GUI for Jython

[Anderson Z. <and...@ba...>]

RGVhciBBbGwsDQoNCmlzIHRoZXJlIGFueSB3b25kZXJmdWwgR1VJIGZvciBKeXRob24/VGhlIGNv
bnNvbGUgd2luZG93IGlzIHN0dXBpZC5JIGFtIHRpcmVkIG9mIGl0Lg0KDQpUaGFua3MsDQpBbmRl
cnNvbi4NCg==

RE: [Jython-users] jython/jythonc performance

[Delaney, T. <tde...@av...>]

> From: Justin Worrall [mailto:Jus...@mo...]
> 
> Does anyone out there have any metrics for jython/jythonc performance
> versus standard java ? I am interested in using jython for its
> elegance/simplicity etc but not at the expense of a dramatic 
> decrease in
> performance versus standard java. Stuff written in jython / 
> run through
> the interpreter seemed very slow (jdk1.3/windows NT). I'm not 
> sure about
> compiling to java through jythonc but notices that the java 
> source code
> generated was very large in comparison to what I could code up in java
> by hand. Any thoughts anyone ?

It depends entirely on your application, but usually there is about a 10%
performance penalty for using jython. As always with python, tight loops
tend to suffer.

There is no real performance gained by compiling using jythonc - that's
primarily for packaging up a final application (say, as a .jar file). You
may have a slightly-faster startup.

The produced java source code (from jythonc) is of course much longer and
more complex than what you could write directly in java - it has to deal
with all the dynamism of python. You will find the same type of thing any
time you have one language translated to another (for example, CFront, which
was one of the earliest methods of coding in C++ - it translated everything
to very horrible-looking C). OTOH, the python code is almost certainly much
more compact and readable.

I you find there is a real performance problem, there is usually no trouble
coding the problem areas in java. One good method to do this is to create a
base class in java, with the performance-critical sections implemented in
the base class, then create a python class extending that base class to do
most of the work in python.

Tim Delaney