Re: Exception during numpy import

Hello Pradeep,

unfortunately Numpy is not supported by Jython, as it is a native C-extenstion for CPython, which are not compatible with Jython in general.

However using JyNI (www.jyni.org) one can at least use basic C-extensions with Jython, currently linux-only. I hope to get it working with Numpy

within half a year or so (but actually estimated this time frame one year ago^^).

Until then your best bet would be Numpy4J (https://github.com/JosephCottam/Numpy4J) which accesses NumPy from java by embedding the CPython

interpreter. It does not integrate with Jython, but you can write a java class wrappering the numpy-functions you need and then acces this class from

Jython.

These Non-Numpy-specific general aproaches to embed CPython in Java are also worth a look:

JPY:

http://jpy.readthedocs.org/en/latest/intro.html

Jepp/Jep:

http://jepp.sourceforge.net

https://github.com/mrj0/jep

- Stefan

Gesendet: Donnerstag, 29. Januar 2015 um 16:35 Uhr

Von: "Pradeep Badiger" <[email protected]>

An: "[email protected]" <[email protected]>

Betreff: [Jython-dev] Exception during numpy import

Hi,

I am trying to import numpy (1.9.1 for python 2.7) package in a jython script and this script is executed using jython-standalone (v 2.7-b1) APIs.

I have set the path to numpy by setting the properties in PythonInterpreter

Properties props = new Properties();

props.setProperty("python.path", "C:\\Python27\\Lib\\site-packages");

PythonInterpreter.initialize(System.getProperties(), props, new String[] {""});

I am getting following exception while evaluating the script.

javax.script.ScriptException: SyntaxError: 'import *' not allowed with 'from .' in C:\Python27\Lib\site-packages\numpy\__init__.py at line number 182 at column number 4

at org.python.jsr223.PyScriptEngine.scriptException(PyScriptEngine.java:190)

at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:42)

at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:31)

at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)

at com.fico.dmip.scriptjs.PythonScriptExecutor.<init>(PythonScriptExample.java:68)

at com.fico.dmip.scriptjs.PythonScriptExample.main(PythonScriptExample.java:50)

Also I tried with jython-standalone-2.7.b3 and it gave me a different exception.

console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.

javax.script.ScriptException: ImportError: No module named type_check in <script> at line number 3

at org.python.jsr223.PyScriptEngine.scriptException(PyScriptEngine.java:202)

at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:42)

at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:31)

at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)

at com.fico.dmip.scriptjs.PythonScriptExecutor.<init>(PythonScriptExample.java:68)

at com.fico.dmip.scriptjs.PythonScriptExample.main(PythonScriptExample.java:50)

Can someone help me on which version of numpy is supported with the release of jython?

Thanks,

Pradeep V.B.

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leadership blogs to news, videos, case studies, tutorials and more. Take a
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