#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

*TL;DR80

Creates new object instances by cloning prototype.

"""

class Prototype(object):

    value = 'default'

    def clone(self, **attrs):

        """Clone a prototype and update inner attributes dictionary"""

        # Python in Practice, Mark Summerfield

        obj = self.__class__()

        obj.__dict__.update(attrs)

        return obj

class PrototypeDispatcher(object):

    def __init__(self):

        self._objects = {}

    def get_objects(self):

        """Get all objects"""

        return self._objects

    def register_object(self, name, obj):

        """Register an object"""

        self._objects[name] = obj

    def unregister_object(self, name):

        """Unregister an object"""

        del self._objects[name]

def main():

    dispatcher = PrototypeDispatcher()

    prototype = Prototype()

    d = prototype.clone()

    a = prototype.clone(value='a-value', category='a')

    b = prototype.clone(value='b-value', is_checked=True)

    dispatcher.register_object('objecta', a)

    dispatcher.register_object('objectb', b)

    dispatcher.register_object('default', d)

    print([{n: p.value} for n, p in dispatcher.get_objects().items()])

if __name__ == '__main__':

    main()

### OUTPUT ###

# [{'objectb': 'b-value'}, {'default': 'default'}, {'objecta': 'a-value'}]