    var __all__ = {};
    var __world__ = __all__;
    
    // Nested object creator, part of the nesting may already exist and have attributes
    var __nest__ = function (headObject, tailNames, value) {
        // In some cases this will be a global object, e.g. 'window'
        var current = headObject;
        
        if (tailNames != '') {  // Split on empty string doesn't give empty list
            // Find the last already created object in tailNames
            var tailChain = tailNames.split ('.');
            var firstNewIndex = tailChain.length;
            for (var index = 0; index < tailChain.length; index++) {
                if (!current.hasOwnProperty (tailChain [index])) {
                    firstNewIndex = index;
                    break;
                }
                current = current [tailChain [index]];
            }
            
            // Create the rest of the objects, if any
            for (var index = firstNewIndex; index < tailChain.length; index++) {
                current [tailChain [index]] = {};
                current = current [tailChain [index]];
            }
        }
        
        // Insert it new attributes, it may have been created earlier and have other attributes
        for (var attrib in value) {
            current [attrib] = value [attrib];          
        }       
    };
    __all__.__nest__ = __nest__;
    
    // Initialize module if not yet done and return its globals
    var __init__ = function (module) {
        if (!module.__inited__) {
            module.__all__.__init__ (module.__all__);
            module.__inited__ = true;
        }
        return module.__all__;
    };
    __all__.__init__ = __init__;
    
    
__pragma__ ('ifdef', '__esv6__')
    // Proxy switch, controlled by __pragma__ ('proxy') and __pragma ('noproxy')
    var __proxy__ = false;  // No use assigning it to __all__, only its transient state is important
__pragma__ ('endif')
    
    
    // Since we want to assign functions, a = b.f should make b.f produce a bound function
    // So __get__ should be called by a property rather then a function
    // Factory __get__ creates one of three curried functions for func
    // Which one is produced depends on what's to the left of the dot of the corresponding JavaScript property
    var __get__ = function (self, func, quotedFuncName) {
        if (self) {
            if (self.hasOwnProperty ('__class__') || typeof self == 'string' || self instanceof String) {           // Object before the dot
                if (quotedFuncName) {                                   // Memoize call since fcall is on, by installing bound function in instance
                    Object.defineProperty (self, quotedFuncName, {      // Will override the non-own property, next time it will be called directly
                        value: function () {                            // So next time just call curry function that calls function
                            var args = [] .slice.apply (arguments);
                            return func.apply (null, [self] .concat (args));
                        },              
                        writable: true,
                        enumerable: true,
                        configurable: true
                    });
                }
                return function () {                                    // Return bound function, code dupplication for efficiency if no memoizing
                    var args = [] .slice.apply (arguments);             // So multilayer search prototype, apply __get__, call curry func that calls func
                    return func.apply (null, [self] .concat (args));
                };
            }
            else {                                                      // Class before the dot
                return func;                                            // Return static method
            }
        }
        else {                                                          // Nothing before the dot
            return func;                                                // Return free function
        }
    }
    __all__.__get__ = __get__;
        
    // Mother of all metaclasses        
    var py_metatype = {
        __name__: 'type',
        __bases__: [],
        
        // Overridable class creation worker
        __new__: function (meta, name, bases, attribs) {
            // Create the class cls, a functor, which the class creator function will return
            var cls = function () {                     // If cls is called with arg0, arg1, etc, it calls its __new__ method with [arg0, arg1, etc]
                var args = [] .slice.apply (arguments); // It has a __new__ method, not yet but at call time, since it is copied from the parent in the loop below
                return cls.__new__ (args);              // Each Python class directly or indirectly derives from object, which has the __new__ method
            };                                          // If there are no bases in the Python source, the compiler generates [object] for this parameter
            
            // Copy all methods, including __new__, properties and static attributes from base classes to new cls object
            // The new class object will simply be the prototype of its instances
            // JavaScript prototypical single inheritance will do here, since any object has only one class
            // This has nothing to do with Python multiple inheritance, that is implemented explictly in the copy loop below
            for (var index = bases.length - 1; index >= 0; index--) {   // Reversed order, since class vars of first base should win
                var base = bases [index];
                for (var attrib in base) {
                    var descrip = Object.getOwnPropertyDescriptor (base, attrib);
                    Object.defineProperty (cls, attrib, descrip);
                }           
__pragma__ ('ifdef', '__esv6__')

                for (var symbol of Object.getOwnPropertySymbols (base)) {
                    var descrip = Object.getOwnPropertyDescriptor (base, symbol);
                    Object.defineProperty (cls, symbol, descrip);
                }
                
__pragma__ ('endif')
            }
            
            // Add class specific attributes to the created cls object
            cls.__metaclass__ = meta;
            cls.__name__ = name;
            cls.__bases__ = bases;
            
            // Add own methods, properties and own static attributes to the created cls object
            for (var attrib in attribs) {
                var descrip = Object.getOwnPropertyDescriptor (attribs, attrib);
                Object.defineProperty (cls, attrib, descrip);
            }
__pragma__ ('ifdef', '__esv6__')

            for (var symbol of Object.getOwnPropertySymbols (attribs)) {
                var descrip = Object.getOwnPropertyDescriptor (attribs, symbol);
                Object.defineProperty (cls, symbol, descrip);
            }
            
__pragma__ ('endif')
            // Return created cls object
            return cls;
        }
    };
    py_metatype.__metaclass__ = py_metatype;
    __all__.py_metatype = py_metatype;
    
    // Mother of all classes
    var object = {
        __init__: function (self) {},
        
        __metaclass__: py_metatype, // By default, all classes have metaclass type, since they derive from object
        __name__: 'object',
        __bases__: [],
            
        // Object creator function, is inherited by all classes (so could be global)
        __new__: function (args) {  // Args are just the constructor args       
            // In JavaScript the Python class is the prototype of the Python object
            // In this way methods and static attributes will be available both with a class and an object before the dot
            // The descriptor produced by __get__ will return the right method flavor
            var instance = Object.create (this, {__class__: {value: this, enumerable: true}});
            
__pragma__ ('ifdef', '__esv6__')
            if ('__getattr__' in this || '__setattr__' in this) {
                instance = new Proxy (instance, {
                    get: function (target, name) {
                        var result = target [name];
                        if (result == undefined) {  // Target doesn't have attribute named name
                            return target.__getattr__ (name);
                        }
                        else {
                            return result;
                        }
                    },
                    set: function (target, name, value) {
                        try {
                            target.__setattr__ (name, value);
                        }
                        catch (exception) {         // Target doesn't have a __setattr__ method
                            target [name] = value;
                        }
                        return true;
                    }
                })
            }
__pragma__ ('endif')

            // Call constructor
            this.__init__.apply (null, [instance] .concat (args));

            // Return constructed instance
            return instance;
        }   
    };
    __all__.object = object;
    
    // Class creator facade function, calls class creation worker
    var __class__ = function (name, bases, attribs, meta) {         // Parameter meta is optional
        if (meta == undefined) {
            meta = bases [0] .__metaclass__;
        }
                
        return meta.__new__ (meta, name, bases, attribs);
    }
    __all__.__class__ = __class__;
    
    // Define __pragma__ to preserve '<all>' and '</all>', since it's never generated as a function, must be done early, so here
    var __pragma__ = function () {};
    __all__.__pragma__ = __pragma__;
    
    