def peekitem(self, index=-<NUM_LIT:1>):
key = self._list[index]<EOL>return key, self[key]<EOL>
Return (key, value) item pair at index.

        Unlike ``popitem``, the sorted dictionary is not modified. Index
        defaults to -1, the last/greatest key in the dictionary. Specify
        ``index=0`` to lookup the first/least key in the dictiony.

        If index is out of range, raise IndexError.