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Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

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package org.python.tests;

import java.util.Map;

import org.python.core.Py;
import org.python.core.PyBuiltinMethod;
import org.python.core.PyBuiltinMethodNarrow;
import org.python.core.PyException;
import org.python.core.PyObject;
import org.python.core.PyType;
import org.python.util.Generic;


public class CustomizableMapHolder {

    public Map held = Generic.map();

    {
        held.put("initial", 7);
    }

    public static void clearAdditions() {
        PyObject dict = PyType.fromClass(CustomizableMapHolder.class).fastGetDict();
        for (String name : new String[] {"__getitem__", "__setitem__", "__getattribute__"}) {
            if (dict.__finditem__(name) != null) {
                dict.__delitem__(name);
            }
        }
    }

    public static void addGetitem() {
        PyBuiltinMethod meth = new PyBuiltinMethodNarrow("__getitem__", 1) {
            @Override
            public PyObject __call__(PyObject arg) {
                CustomizableMapHolder inst = Py.tojava(self, CustomizableMapHolder.class);
                String key = Py.tojava(arg, String.class);
                return Py.java2py(inst.held.get(key));
            }
        };
        PyType.fromClass(CustomizableMapHolder.class).addMethod(meth);
    }

    public static void addSetitem() {
        PyBuiltinMethod meth = new PyBuiltinMethodNarrow("__setitem__", 2) {
            @Override
            public PyObject __call__(PyObject arg1, PyObject arg2) {
                CustomizableMapHolder inst = Py.tojava(self, CustomizableMapHolder.class);
                String key = Py.tojava(arg1, String.class);
                Integer val = Py.tojava(arg2, Integer.class);
                inst.held.put(key, val);
                return Py.None;
            }
        };
        PyType.fromClass(CustomizableMapHolder.class).addMethod(meth);
    }

    public static void addGetattribute() {
        final PyObject objectGetattribute = PyObject.TYPE.__getattr__("__getattribute__");
        PyBuiltinMethod meth = new PyBuiltinMethodNarrow("__getattribute__", 1) {
            @Override
            public PyObject __call__(PyObject name) {
                try {
                    return objectGetattribute.__call__(self, name);
                } catch (PyException pye) {
                    if (!pye.match(Py.AttributeError)) {
                        throw pye;
                    }
                }
                CustomizableMapHolder inst = Py.tojava(self, CustomizableMapHolder.class);
                return Py.java2py(inst.held.get(Py.tojava(name, String.class)));
            }
        };
        PyType.fromClass(CustomizableMapHolder.class).addMethod(meth);
    }
}