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In [29]: from pymongo.dbref import DBRef

In [30]: a = {'foo': DBRef(collection='bla', database='bar', id='goo')}


In [35]: deepcopy(a)
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)

/home/namlook/Documents/projets/mongokit-hg/mongokit/<ipython console> in <module>()

/usr/lib/python2.6/copy.pyc in deepcopy(x, memo, _nil)
    160     copier = _deepcopy_dispatch.get(cls)
    161     if copier:
--> 162         y = copier(x, memo)
    163     else:
    164         try:

/usr/lib/python2.6/copy.pyc in _deepcopy_dict(x, memo)
    253     memo[id(x)] = y
    254     for key, value in x.iteritems():
--> 255         y[deepcopy(key, memo)] = deepcopy(value, memo)
    256     return y
    257 d[dict] = _deepcopy_dict

/usr/lib/python2.6/copy.pyc in deepcopy(x, memo, _nil)
    169             y = _deepcopy_atomic(x, memo)
    170         else:
--> 171             copier = getattr(x, "__deepcopy__", None)
    172             if copier:
    173                 y = copier(memo)

/usr/local/lib/python2.6/dist-packages/pymongo-1.9-py2.6-linux-i686.egg/bson/dbref.pyc in __getattr__(self, key)
     79 
     80     def __getattr__(self, key):
---> 81         return self.__kwargs[key]
     82 
     83     def as_doc(self):

KeyError: '__deepcopy__'