def setdefault(self, key, default=None):
        try:
            wr = self.data[key]
        except __HOLE__:
            self.data[key] = KeyedRef(default, self._remove, key)
            return default
        else:
            return wr()
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/weakref.py/WeakValueDictionary.setdefault