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from copy import deepcopy

class Prototype:

def __init__(self):

self._objs = {}

def registerObject(self, name, obj):

"""

register an object.

"""

self._objs[name] = obj

def unregisterObject(self, name):

"""unregister an object"""

del self._objs[name]

def clone(self, name, **attr):

"""clone a registered object and add/replace attr"""

obj = deepcopy(self._objs[name])

obj.__dict__.update(attr)

return obj

if __name__ == '__main__':

class A:

pass

a = A()

prototype = Prototype()

prototype.registerObject("a", a)

b = prototype.clone("a", a=1, b=2, c=3)

print(a)

print(b.a, b.b, b.c)