>>> dd = DiskDict(DATA_FILE)
        >>> print(next(dd.items()))
        ('deepcompute', 1)

def items(self):
        '''
        >>> dd = DiskDict(DATA_FILE)
        >>> print(next(dd.items()))
        ('deepcompute', 1)
        '''

        for k, v in self._f:
            yield self._deckey(k), pickle.loads(v)