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)