Jython :: which modules are available to PythonInterpreter and how to add more

Question

I am using the Jython 2.5.3 PythonInterpreter class to evaluate some simple scripts but when I need to import any non-core modules I get an exception. Do I have to add some jython library jars in the CLASSPATH?

Narrow-down code that demonstrates the problem:

import org.python.core.*;
import org.python.util.PythonInterpreter;

public class JythonTest {

    public static void main(String args[]) throws Exception {
        String scriptA = "import json"; // "import datetime" fails as well
        PythonInterpreter pi = new PythonInterpreter();
        PyCode code = pi.compile(scriptA);
        PyObject result = pi.eval(code);
    }
}

Running the above with only jython-2.5.3.jar in the CLASSPATH fails with the following trace:

 [java] ImportError: No module named json
 [java] 
 [java]     at org.python.core.Py.ImportError(Py.java:304)
 [java]     at org.python.core.imp.import_first(imp.java:755)
 [java]     at org.python.core.imp.import_module_level(imp.java:837)
 [java]     at org.python.core.imp.importName(imp.java:917)
 [java]     at org.python.core.ImportFunction.__call__(__builtin__.java:1220)
 [java]     at org.python.core.PyObject.__call__(PyObject.java:357)
 [java]     at org.python.core.__builtin__.__import__(__builtin__.java:1173)
 [java]     at org.python.core.imp.importOne(imp.java:936)
 [java]     at org.python.pycode._pyx0.f$0(<script>:2)
 [java]     at org.python.pycode._pyx0.call_function(<script>)
 [java]     at org.python.core.PyTableCode.call(PyTableCode.java:165)
 [java]     at org.python.core.PyCode.call(PyCode.java:18)
 [java]     at org.python.core.Py.runCode(Py.java:1275)
 [java]     at org.python.core.__builtin__.eval(__builtin__.java:484)
 [java]     at org.python.core.__builtin__.eval(__builtin__.java:488)
 [java]     at org.python.util.PythonInterpreter.eval(PythonInterpreter.java:198)
 [java]     at JythonTest.main(JythonTest.java:10)

mzjn · Accepted Answer · 2013-06-12 09:11:59Z

4

You seem to be using the Jython jar file that doesn't include the bundled Python files (the standard library in the /Lib folder). I believe it should work if you use the standalone jar instead. See

answered Jun 12, 2013 at 9:11

mzjn

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3 Comments

Marcus Junius Brutus Over a year ago

I can confirm that with the standalone jar in the runtime classpath the module 'datetime' is now found (whereas previously, it was not). 'import json' however still yields the same failure in both cases (either with jython-standalone-2.5.3.jar or with jython-2.5.3.jar) in the runtime classpath.

mzjn Over a year ago

The json module was added in Python 2.6. It is not available in Jython 2.5.3. You may want to try Jython 2.7beta1, which includes json. See jython.org/downloads.html.

Jobin Thomas Over a year ago

I just had the issue. Added jython-standalone 2.7.0 released version in my pom.xml. Works!

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