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prototype.py

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#!/usr/bin/env python

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

import copy

class Prototype:

def __init__(self):

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 clone(self, name, **attr):

"""Clone a registered object and update inner attributes dictionary"""

obj = copy.deepcopy(self._objects.get(name))

obj.__dict__.update(attr)

return obj

class A:

def __init__(self):

self.x = 3

self.y = 8

self.z = 15

self.garbage = [38, 11, 19]

def __str__(self):

return '{} {} {} {}'.format(self.x, self.y, self.z, self.garbage)

def main():

a = A()

prototype = Prototype()

prototype.register_object('objecta', a)

b = prototype.clone('objecta')

c = prototype.clone('objecta', x=1, y=2, garbage=[88, 1])

print([str(i) for i in (a, b, c)])

if __name__ == '__main__':

main()

### OUTPUT ###

# ['3 8 15 [38, 11, 19]', '3 8 15 [38, 11, 19]', '1 2 15 [88, 1]']