>>> dd = DiskDict(DATA_FILE)
        >>> print(dd.get('deepcompute'))
        1

def get(self, k, default=None):
        '''
        >>> dd = DiskDict(DATA_FILE)
        >>> print(dd.get('deepcompute'))
        1
        '''

        k = self._enckey(k)
        v = self._f.get(k, None)
        if v is None: return default
        return pickle.loads(v)