code: def reindex(self, ind):
          
  
          if isinstance(ind, pd.MultiIndex):
              try:
                  return self.new(self.data.reindex(ind))
              except:
                  raise RuntimeError('QADATASTRUCT ERROR: CANNOT REINDEX')
          else:
              raise RuntimeError(
                  'QADATASTRUCT ERROR: ONLY ACCEPT MULTI-INDEX FORMAT'
              )
docs: reindex
  
          Arguments:
              ind {[type]} -- [description]
  
          Raises:
              RuntimeError -- [description]
              RuntimeError -- [description]
  
          Returns:
              [type] -- [description]