import module error: calling python script using jython in a java program

Question

I am trying to execute a python file from netbeans using jython in a java program. My code is like this:

PythonInterpreter.initialize(System.getProperties(), System.getProperties(), 
 new String[0]);
PythonInterpreter interp = new PythonInterpreter();
interp.execfile("as1.py");

error is:

Traceback (most recent call last):
 File "as1.py", line 2, in <module>
 import datetime
ImportError: No module named datetime

and also interdependent python files also not importing those are in same directory.

like:

PythonInterpreter.initialize(System.getProperties(), System.getProperties(), new String[0]);
PythonInterpreter interp = new PythonInterpreter();
interp.execfile("calen.py");

python files are:

calen.py:

from as1 import * 
print ( "I am printing" + str(Moh(1000).run()))

as1.py:

from time import time
import datetime
class Moh:
 def __init__(self, n): 
 self.n = n
 def run(self):
 data = [1,2,3,4,5]
 start = time()
 for i in range(self.n):
 data.append(i)
 end = time()
 return ( end - start )/self.n
if __name__ == "__main__":
 print ( "I am printing" + str(Moh(1000).run()))

error is:

Traceback (most recent call last):
 File "calen.py", line 1, in <module>
 from as1 import * 
ImportError: No module named as1

• user3012759: what version of jython are you using?
• mohan: Thanks for asking - Jyhton version 2.5.3
• kvivek: Hope this link:[stackoverflow.com/a/483165/1982677] helps.

Answer 1

It is essential to set "python.path" for the PythonInterpreter so that it can load your the as1 module. To do that, you have to initialize PythonInterpreter in this way:

Properties properties = System.getProperties();
properties.put("python.path", PATH_TO_PARENT_DIRECTORY_OF_AS1_PY);
PythonInterpreter.initialize(System.getProperties(), properties, new String[0]);
PythonInterpreter interp = new PythonInterpreter();
interp.execfile("calen.py");