def __setitem__(self, key, value, PREV=0, NEXT=1, dict_setitem=dict.__setitem__):
        # Setting a new item creates a new link which goes at the end of the linked
        # list, and the inherited dictionary is updated with the new key/value pair.
        if key not in self:
            root = self.__root
            last = root[PREV]
            last[NEXT] = root[PREV] = self.__map[key] = [last, root, key]
        dict_setitem(self, key, value)
od.__setitem__(i, y) <==> od[i]=y
dataset/ETHPy150Open baseblack/ReproWeb/3rdParty/python/ordereddict.py/OrderedDict.__setitem__