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

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

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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