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def popitem(self):
    key, value = dict.popitem(self)
    self.callback(("__setitem__", key, default), ("popitem",))
    return key, value

Traceback (most recent call last):
  File "undoable.py", line 453, in <module>
    l.popitem()
AttributeError: 'observed_list' object has no attribute 'popitem'

def sort(self, cmpfunc=None):
    list.sort(self, cmpfunc)
    self.callback(("replace", oldlist), ("sort",))