socket.getaddrinfo() breaks ftplib FTP client

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Re: socket.getaddrinfo() breaks ftplib FTP client

[Peter]
> Consider the following call taken not quite verbatim from ftplib.makeport().
> (The difference is that socket.AF_INET) is actually self.af, which can be
> either socket.AF_INET or socket.AF_INET6.) Assume “import socket”.

Hi Peter,

I'm currently attending Europython at the moment.

I promise I'll look at this in detail soon, either during the sprints
at the end of the week, or when I return home at the weekend.

Meantime, it would be good if you record a bug for this in the bug database.

http://bugs.jython.org

Regards,

Alan.

------------------------------------------------------------------------------

Re: socket.getaddrinfo() breaks ftplib FTP client

Done: issue 1391. (There's no 2.5.0 in the "Versions" list.)

PJDM
-- 
Peter Mayne
Hewlett-Packard
Canberra, ACT, Australia 

-----Original Message-----
From: alan.kennedy.name <at> gmail.com [mailto:alan.kennedy.name <at> gmail.com] On Behalf Of Alan Kennedy
Sent: Thursday, 2 July 2009 12:34 AM
To: Mayne, Peter
Cc: jython-users <at> lists.sourceforge.net
Subject: Re: [Jython-users] socket.getaddrinfo() breaks ftplib FTP client

[Peter]
> Consider the following call taken not quite verbatim from ftplib.makeport().
> (The difference is that socket.AF_INET) is actually self.af, which can be
> either socket.AF_INET or socket.AF_INET6.) Assume "import socket".

Hi Peter,

I'm currently attending Europython at the moment.

I promise I'll look at this in detail soon, either during the sprints
at the end of the week, or when I return home at the weekend.

Meantime, it would be good if you record a bug for this in the bug database.

http://bugs.jython.org

Regards,

Alan.

------------------------------------------------------------------------------

Jython Class.forName()

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Re: Jython Class.forName()

On Tue, Jul 7, 2009 at 10:39 AM, Carl<s7plc <at> ttlc.net> wrote:
> I am trying to use the jtds driver to connect to a MSSQL database, and can’t
> get past the Class.forName line in the code. I have done exhausting google
> searches and found others with the same problem, but no definitive solution
> or workaround. I’m guessing there must be something wrong with my Jython
> setup or installation.
>
>
>
> I am testing with NetBeans 6.7, and have tried this with Jython versions
> 2.2, 2.5b0+, and 2.5rc3. Within NetBeans, under services, I set up the jtds
> driver, and was able to define a URL and connect to my database, so I assume
> the rest of my code will work if I get past the Class.forName problem.
>
>
>
> The code is pretty basic:
>
>
>
> from java.sql import DriverManager
>
> from java.lang import Class
>
>
>
> Class.forName("net.sourceforge.jtds.jdbc.Driver")
>
>
>
> Error: “java.lang.ClassNotFoundException: java.lang.ClassNotFoundException:
> net.sourceforge.jtds.jdbc.Driver”
>
>
>
> I found one note that mentioned adding “–verify” to the command arguments,
> but other notes saying that it wasn’t necessary with version 2.5.
--verify is gone in 2.5.0.  The one thing to make sure of is that you
are not calling jython with the --boot option (the behavior of
--verify is now the default, --boot puts jython on the boot classpath,
which would cause this problem).

This almost certainly means that you don't have
"net.sourceforge.jtds.jdbc.Driver" on your classpath.  You could test
this another way by trying the following jython code:

from net.sourceforge.jtds.jdbc import Driver

Have you tried the equivalent Java code in your environment?  That's
another good troubleshooting step.

-Frank

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Jython concurrency in the PythonInterpreter class

I am investigating the use of Jython to replace a simple home-grown
scripting language for a Java application. I'm instantiating a
PythonInterpreter and executing an entire jython file at once, like
this:

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

It works beautifully for sequential execution of Java method calls,
but I'm uncertain as to the best way to implement concurrent
execution. In my first attempt, using threads, "test.py" included code
like this:

from threading import Thread
Thread(JavaClassA.methodA()).start()
Thread(JavaClassB.methodB()).start()

This is a simple case with no shared data between methodA and methodB.
Both methods write to a log4j log file. The entries in the log file
appear sequentially, labeled as running on thread "MainThread". That
is, the results are the same as if I just do this:

JavaClassA.methodA()
JavaClassB.methodB()

Is the PythonInterpreter class capable of creating new threads? Is
there a better technique for concurrency that I should use instead?

Any comments are greatly appreciated.

Thanks.

Ted

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Pydev 1.4.7 Released

Hi All,

Pydev and Pydev Extensions 1.4.7 have been released

Details on Pydev Extensions: http://www.fabioz.com/pydev
Details on Pydev: http://pydev.sf.net
Details on its development: http://pydev.blogspot.com

Release Highlights in Pydev Extensions:
-----------------------------------------------------------------

* The interactive console can be used on the remote debugger
* Remote debugger properly redirects contents from the server on multiple runs.
* Providing context-independent completions when other completions are
not available (until now, it only gave those completions for method
parameters)
* The number of chars required to show the context-insensitive
completion can now be customized.
* Fixed problem with Eclipse 3.5: "Invalid Thread Access" when trying
to rename a class

Release Highlights in Pydev:
----------------------------------------------

* Iron Python support
* Fixed issue when configuring interpreter on Eclipse 3.3 and 3.2 (was
using API only available in 3.4)
* Google App Engine
      o Popup menus for google app engine are now working with eclipse 3.2
      o Fixed issues when google app engine project has spaces in path
* Launching
      o Ctrl+F9 can be used to run as unit-test and select which tests
will be run
      o F9 will now run the current editor based on the project type
      o Changed run icons
      o Run configurations can be created for the project
      o Run as unit-test can have --filter and --tests as a parameter
set in the run configuration
* Shift left can now shift even when there are less chars than the
required indent string
* Top-level modules on .egg files are now properly recognized
* Auto-config fixed
* Fixed problem when .pydevproject was not a parseable xml file (the
pydev package explorer wouldn't work because of that)
* When a new interpreter is created, it's properly selected in the tree
* Code-completion better heuristic when analyzing function return
that's called on self.
* Code-completion in the interactive console now handles import
sections correctly
* Code formatter: Spaces after square and curly braces are no longer
changed when an unary operator is found afterwards
* Fixed problem when recognizing encodings (regexp was not correct)

What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python, Jython
and Iron Python development -- making Eclipse a first class Python IDE
-- It comes with many goodies such as code completion, syntax
highlighting, syntax analysis, refactor, debug and many others.

Cheers,

Re: Jython concurrency in the PythonInterpreter class

Hi Ted,

On Wed, Jul 8, 2009 at 1:32 PM, Ted Larson
Freeman<freeman <at> alumni.stanford.org> wrote:
> In my first attempt, using threads, "test.py" included code
> like this:
>
> from threading import Thread
> Thread(JavaClassA.methodA()).start()
> Thread(JavaClassB.methodB()).start()

Check out the docs for the Thread object:
http://docs.python.org/library/threading.html#thread-objects  The
first argument is the thread group, so you're setting the thread group
for your threads with the results of methodA and methodB.  Since
you're calling methodA and methodB to create arguments for Thread,
they're run in the main thread.

What you want to do is set the target of the Thread to the function or
method you want invoked on the new thread, and then call start.  For
example, the code below calls add on an ArrayList on a separate
thread:

Jython 2.5.0+ (trunk:6503:6505M, Jul 8 2009, 18:36:14)
[Java HotSpot(TM) 64-Bit Server VM (Apple Inc.)] on java1.6.0_13
Type "help", "copyright", "credits" or "license" for more information.
>>> from threading import Thread
>>> from java.util import ArrayList
>>> l = ArrayList()
>>> Thread(target=l.add, args=(5,)).start()
>>> l
[5]

The args keyword arg is a tuple of positional arguments to pass to the
target method.

With your examples, you'd want to do
Thread(target=JavaClassA.methodA).start() and
Thread(target=JavaClassB.methodB).start().

Hope this helps,
Charlie

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Re: Jython concurrency in the PythonInterpreter class

Thanks for the clear and amazingly prompt reply, Charlie!

That got me going. At first I was troubled by seeing all of my new
threads labeled "Thread" in the log4j output (is this a bug?). I found
that by assigning my own names to the threads I could see each thread
executing as expected. I ended up with this:

t1 = Thread(target=JavaClassA.methodA, name='t1')
t2 = Thread(target=JavaClassB.methadB, name='t2')
t1.start()
t2.start()
t1.join()
t2.join()

Thanks again,

Ted

On Wed, Jul 8, 2009 at 6:46 PM, Charlie Groves<charlie.groves <at> gmail.com> wrote:
> Hi Ted,
>
> On Wed, Jul 8, 2009 at 1:32 PM, Ted Larson
> Freeman<freeman <at> alumni.stanford.org> wrote:
>> In my first attempt, using threads, "test.py" included code
>> like this:
>>
>> from threading import Thread
>> Thread(JavaClassA.methodA()).start()
>> Thread(JavaClassB.methodB()).start()
>
> Check out the docs for the Thread object:
> http://docs.python.org/library/threading.html#thread-objects  The
> first argument is the thread group, so you're setting the thread group
> for your threads with the results of methodA and methodB.  Since
> you're calling methodA and methodB to create arguments for Thread,
> they're run in the main thread.
>
> What you want to do is set the target of the Thread to the function or
> method you want invoked on the new thread, and then call start.  For
> example, the code below calls add on an ArrayList on a separate
> thread:
>
> Jython 2.5.0+ (trunk:6503:6505M, Jul 8 2009, 18:36:14)
> [Java HotSpot(TM) 64-Bit Server VM (Apple Inc.)] on java1.6.0_13
> Type "help", "copyright", "credits" or "license" for more information.
>>>> from threading import Thread
>>>> from java.util import ArrayList
>>>> l = ArrayList()
>>>> Thread(target=l.add, args=(5,)).start()
>>>> l
> [5]
>
> The args keyword arg is a tuple of positional arguments to pass to the
> target method.
>
> With your examples, you'd want to do
> Thread(target=JavaClassA.methodA).start() and
> Thread(target=JavaClassB.methodB).start().
>
> Hope this helps,
> Charlie
>
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> vendors submitting new applications to BlackBerry App World(TM) will have
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> _______________________________________________
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> https://lists.sourceforge.net/lists/listinfo/jython-users
>
>
>

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Jython Sockets and Strings

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