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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;

import java.util.Arrays;

public class PyMethodDescr extends PyDescriptor implements
        PyBuiltinFunction.Info {

    protected int minargs, maxargs;

    protected PyBuiltinFunction meth;

    public PyMethodDescr(String name,
                         Class c,
                         int minargs,
                         int maxargs,
                         PyBuiltinFunction func) {
        this.name = name;
        this.dtype = PyType.fromClass(c);
        this.minargs = minargs;
        this.maxargs = maxargs;
        this.meth = func;
        this.meth.setInfo(this);
    }

    public String getName() {
        return name;
    }

    public int getMaxargs() {
        return maxargs;
    }

    public int getMinargs() {
        return minargs;
    }

    public String toString() {
        return "";
    }
    
    public PyObject __call__(PyObject[] args){
        return __call__(args, Py.NoKeywords);
    }
    
    public PyObject __call__(PyObject[] args, String[] kwargs){
        if(args.length == kwargs.length){
            throw Py.TypeError(name + " requires at least one argument");
        }
        checkCallerType(args[0]);
        PyObject[] actualArgs = new PyObject[args.length - 1];
        System.arraycopy(args, 1, actualArgs, 0, actualArgs.length);
        return meth.bind(args[0]).__call__(actualArgs, kwargs);
        
    }

    public PyException unexpectedCall(int nargs, boolean keywords) {
        return PyBuiltinFunction.DefaultInfo.unexpectedCall(nargs,
                                                            keywords,
                                                            name,
                                                            minargs,
                                                            maxargs);
    }

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

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