def smallest_item(self):
        '''D.smallest_item() -> a (key, value) pair with the smallest key;
        raise KeyError if D is empty.'''
        key = self.smallest_key()
        return key, self[key]
D.smallest_item() -> a (key, value) pair with the smallest key;
        raise KeyError if D is empty.
recipes/Python/576998_Sorted_dictionary/recipe-576998.py