python-patterns/prototype.py at master · chinmayb/python-patterns · GitHub

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

importcopy


classPrototype:

def__init__(self):
self._objects= {}

defregister_object(self, name, obj):
"""Register an object"""
self._objects[name] =obj

defunregister_object(self, name):
"""Unregister an object"""
delself._objects[name]

defclone(self, name, **attr):
"""Clone a registered object and update inner attributes dictionary"""
obj=copy.deepcopy(self._objects.get(name))
obj.__dict__.update(attr)
returnobj


classA:
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)


defmain():
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) foriin (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]']