code: def items(self):
          
          logger.debug('call items')
          return [(key, self.get(key)) for key in self.keys()]
docs: Return list of tuples of keys and values in db
  
          >>> dc = Dictator()
          >>> dc['l0'] = [1, 2, 3, 4]
          >>> dc.items()
          [('l0', ['1', '2', '3', '4'])]
          >>> dc.clear()
  
          :return: list of (key, value) pairs
          :rtype: list of tuple