Re: [Jython-users] does PythonInterpreter look at the registry?

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

On Wed, 28 Mar 2001 17:01:00 +1000, you wrote:

>Hi guys! I am trying to embed Jython in a large multi-tier Java app. I am 
>trying to figure out what I have to do to get it to pick up the python.path
>setting from the registry. What I have done so far is:
>
> * change the registry to say:
>python.path = f:\\jython-2.1a1\\lib    
> * the registry is f:\jython-2.1a1\registry
> * pass -Dpython.home=f:\jython-2.1a1 as a command line arg to the app
> * instantiate a PythonInterpreter
> * put my library, "minestar_admin.py" into f:\jython-2.1a1\lib.
>
>Now, my theory on how it should work is that when I instantiate
>PythonInterpreter it looks in the system properties for the python.home
>setting. Then it looks in that directory for the file 'registry'. Then it
>loads that file, giving it a value for python.path. Then it looks along
>that path to resolve things. 

Yep, that should work.

>However, when I exec the line
>
>import minestar_admin
>
>I get:
>
>Traceback (innermost last):
>  File "<string>", line 1, in ?
>NameError: minestar_admin
>
>..
>
>which suggests to me that PythonInterpreter can't find the file. 

Failing to find the .py file should result in an 
  ImportError: no module named... 
I think the NameError is a different problem, but you can check your
actual python.path by inserting 

        interp.exec("import sys; print sys.prefix, sys.path");

If you still can get a handle on the problem, try to make a small
standalone example that show the bug and post it here. This worked for
me:

----------- i:\\temp\\ss9\\registry -----------
python.path=i:\\temp\\ss9\\subdir

----------- i:\\temp\\ss9\\subdir\\minestar_admin.py -----------
print "hello"


----------- si7.java -----------
import org.python.core.*;
import org.python.util.*;

public class si7 {
    public static void main(String[] args) {
        PythonInterpreter interp = new PythonInterpreter();
        interp.exec("import sys; print sys.prefix, sys.path");
        interp.exec("import minestar_admin");
    }
}

----------- command line -----------
java -Dpython.home=i:\temp\ss9 si7


>Could
>someone please tell me what is wrong with my hypothesis above?

Just for your info, you can also set the python.path property this way:


http://jython.sourceforge.net/cgi-bin/faqw.py?req=show&file=faq06.002.htp

regards,
finn