Re: [Jython-users] Jython sharp edges

[Kevin Butler <kbutler@ca...>]

Robert Hanlin wrote:
> Hi,
> 
> I'm researching Jython, because I'm being a bit of a
> local evangelist, but must find out the sharp places. 
> Where you sense the need to drop back into Java.
> 
> What parts of Jython really seem to not work properly,
> or frustrate you the most?  Java has a few such
> places, so no big deal if Jython has them.

Things that I recall having bitten me or others around me:

- toString( arg ) methods don't get identified correctly

- If an interface X defines a field flag (boolean flag=false), and a class Y 
implements X and declares the same field (boolean flag=true), Java has an 
unexpected behavior:

	Y y = new Y();
	X x = y;
	x.flag != y.flag

Jython does not follow the same "hiding" rules, because you can't declare that 
a variable is an instance of the interface instead of the class. (This is more 
a Java gotcha, but because the developer tested in Jython, he didn't identify 
the problem):

> And sort of on the side, is interest waning as people
> are excited in Python.NET?

I haven't heard much about the experimental Python.NET implementation for 
quite a while.  It doesn't seem to be generating a lot of interest or making a 
lot of progress, but maybe I'm just not watching the right sites...

kb

Re: [Jython-users] Jython sharp edges

[<vincenzo.piombo@fa...>]

From:           	Robert Hanlin <findler_lambda@...>
To:             	jython-users@...
Subject:        	[Jython-users] Jython sharp edges
Date sent:      	Sun, 9 Jun 2002 23:29:19 -0700 (PDT)

> Where you sense the need to drop back into Java.
When I need method overloading for example (particularly when I 
need to subclass a Java class that uses method overloading !)

vincenzo.piombo@...

[Jython-users] Trouble with "?" (Conditional Operator)

[Morgan V Linton <mvlinton@us...>]

Hi everyone,

Well, all of the Java errors I am getting are coming from Jython's own
libraries!!! This seems quite strange to me. The errors I am getting is any
line of Java code generated from a Python library in which it uses a "?"
for conditionals in Java. The error is shown below:



.\jpywork\xml\dom\ext\reader\__init__.java:175: not a statement
            (t$0$PyObject = frame.getlocal(1)).__nonzero__() ? frame.
getglobal("ReleaseNode").__call__(frame.getlocal(1)) : t$0$PyObject;
^


I get 13 of these errors all on Jython's own libraries and all for the same
reason. I am sure that I am doing something wrong because I haven't heard
anyone else complain about this problem. Thanks in advance for your help.

- Morgan

[Jython-users] Help Using Jythonc

[Morgan V Linton <mvlinton@us...>]

Hello everyone,

I have a question that seems simple enough yet I have not been able to find
an answer to it. When I compile a file with the "-d" option and thus
compile the dependent code (i.e. libraries, etc.) I get 13 errors. These
are simple Java errors that I fix. The problem is that when I recompile
with jythonc it overwrites the .java files that I have fixed and thus the
same 13 errors show-up again. How can I use jythonc to compile after I have
corrected my errors without overwriting the files over and over again.
Thanks in advance for your help.

- Morgan

[Jython-users] Jython sharp edges

[Robert Hanlin <findler_lambda@ya...>]

Hi,

I'm researching Jython, because I'm being a bit of a
local evangelist, but must find out the sharp places. 
Where you sense the need to drop back into Java.

What parts of Jython really seem to not work properly,
or frustrate you the most?  Java has a few such
places, so no big deal if Jython has them.

And sort of on the side, is interest waning as people
are excited in Python.NET?

Thanks,
findler

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