Re: [Jython-users] Difference between using the jython program and using the python interpreter from Java (__main__ vs main)

[Jeff E. <jem...@fr...>]

I haven't tried this.  It might work in your cirumstance.


// Remove old __main__.
Py.getSystemState().modules.__delitem__("__main__");
// Recreate.
mod = imp.addModule("__main__");
interp.setLocals(mod.__dict__);


Balaji Srinivasan wrote:
> Hi JeffIve run into another problem with the code below. Looks like there is
> some static state. So if I evaluate two different code segments with the
> same JVM (but different interpreter instances), I get the symbols from both
> runs. Is there any way I can clean up the global namespace?
> Thanks
> Balaji
> 
> On 9/18/07, Balaji Srinivasan <bal...@gm...> wrote:
>> Thanks a lot Jeff. That worked.!!
>>
>>
>> Balaji
>>
>> On 9/18/07, Jeff Emanuel < jem...@fr...> wrote:
>>> import org.python.core.imp;
>>> import org.python.core.PyModule;
>>>
>>> Balaji Srinivasan wrote:
>>>> Thanks Jeff. But what is imp?
>>>> I tried interp.addModule and that doesnt compile.Thanks
>>>> Balaji
>>>>
>>>> On 9/18/07, Jeff Emanuel < jem...@fr...> wrote:
>>>>> Add this after creating your interpreter:
>>>>>
>>>>>            PyModule mod = imp.addModule("__main__");
>>>>>            interp.setLocals(mod.__dict__);
>>>>>
>>>>>
>>>>> Balaji Srinivasan wrote:
>>>>>> Hi EveryoneI found a difference between the way jython works when it
>>> is
>>>>>> called from the command line and when it is called from a java
>>> program.
>>>>> Ive
>>>>>> tried my best to explain it and get a workaround but all attempts
>>> have
>>>>>> failed. I will appreciate any help.
>>>>>>
>>>>>>
>>>>>> What I want to do is given a script string I want to find all the
>>>>> functions
>>>>>> defined in the script.
>>>>>> Lets say the script fragment is as follows:
>>>>>> def foobar():
>>>>>>     print("foobar")
>>>>>>
>>>>>>
>>>>>> If I try this via the jython program, I get the following:
>>>>>>
>>>>>>
>>>>>> bash$ jython
>>>>>> Jython 2.2 on java1.5.0_11
>>>>>> Type "copyright", "credits" or "license" for more information.
>>>>>>>>> def foobar():
>>>>>> ...     print("foobar")
>>>>>> ...
>>>>>>>>> this_module = __import__(__name__)
>>>>>> *>>> print __name__*
>>>>>> *__main__*
>>>>>>>>> for e in dir():
>>>>>> ...     if (callable(getattr(this_module, e))):
>>>>>> ...         print(e + " is callable")
>>>>>> ...
>>>>>> *foobar is callable*
>>>>>>
>>>>>>
>>>>>> Notice that the __name__ shows up as __main__ and that foobar shows
>>> up
>>>>> as
>>>>>> callable. So far so good.
>>>>>>
>>>>>>
>>>>>> Now if I try to do the same thing via java:
>>>>>>
>>>>>>
>>>>>> bash$ java Test2
>>>>>> Traceback (innermost last):
>>>>>>   File "<string>", line 4, in ?
>>>>>> *ImportError: no module named main*
>>>>>> *Name was main*
>>>>>> *
>>>>>> *
>>>>>> Now why is the __name__ set to main? I even tried hardcoding the
>>>>> __import__
>>>>>> to call __import__('__main__'). It couldnt find that module either.
>>>>>> Any ideas on how I can get this to work? Any help would be greatly
>>>>>> appreciated.
>>>>>>
>>>>>>
>>>>>> Here is the java code:
>>>>>> import org.python.util.PythonInterpreter ;
>>>>>> import org.python.core.*;
>>>>>>
>>>>>>
>>>>>> public class Test2 {
>>>>>>
>>>>>>
>>>>>>         public static void main(String[] args) throws Exception {
>>>>>>                 PythonInterpreter interp = new PythonInterpreter();
>>>>>>                 interp.setErr(System.err);
>>>>>>                 interp.setOut(System.out);
>>>>>>                 String s = "def foobar():\n" +
>>>>>>                            "    print(\"foobar\")\n" +
>>>>>>                            "name=__name__\n" +
>>>>>>                            "this_module = __import__(__name__)\n" +
>>>>>>                            "for e in dir():\n" +
>>>>>>                            "    if (callable(getattr(this_module,
>>>>> e))):\n" +
>>>>>>                            "        print(e + \" is callable\")\n";
>>>>>>
>>>>>>
>>>>>>                 try {
>>>>>>                         interp.exec(s);
>>>>>>                 } catch (PyException e) {
>>>>>>                         e.printStackTrace ();
>>>>>>                 }
>>>>>>                 System.out.println("Name was " + interp.get
>>> ("name"));
>>>>>>         }
>>>>>> }
>>>>>>
>>>>>>
>>>>>> Thanks a lot in advance and apologies if I missed an FAQ that covers
>>>>> this. I
>>>>>> did try to do my research before posting this.
>>>>>> Thanks
>>>>>> Balaji
>>>>>>
>>>>>>
>>>>>>
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