code: def get_return_list(self, data):
          
          return_list = []
          lst = self.get_list_key(data, 'return')
          for l in lst:
              name, desc, rtype = l
              if l[2] is None:
                  rtype = l[0]
                  name = None
                  desc = desc.strip()
              return_list.append((name, desc, rtype))
  
          return return_list
docs: Get the list of returned values.
          The list contains tuples (name=None, desc, type=None)
  
          :param data: the data to proceed