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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.core;

public class PyClassMethodDescr extends PyMethodDescr {

    public PyClassMethodDescr(String name,
                              Class c,
                              int minargs,
                              int maxargs,
                              PyBuiltinFunction meth) {
        super(name, c, minargs, maxargs, meth);
    }

    protected void checkCallerType(PyObject obj) {
        if((PyType)obj != dtype && !((PyType)obj).isSubType(dtype))
            throw get_wrongtype((PyType)obj);
    }

    public PyObject __get__(PyObject obj, PyObject type) {
        if (obj != null) {
            checkCallerType(obj.getType());
            return meth.bind(obj.getType()); 
        }else if(type != null){
            checkCallerType(type);
            return meth.bind(type);
        }
        return this;
    }
}