code: def _convert_params(self, parameters):
          
          if isinstance(parameters, dict):
              return [self.make_param(name, value)
                      for name, value in parameters.items()]
          else:
              params = []
              for parameter in parameters:
                  params.append(self.make_param('', parameter))
              return params
docs: Converts a dict of list of parameters into a list of :class:`Column` instances.
  
          :param parameters: Can be a list of parameter values, or a dict of parameter names to values.
          :return: A list of :class:`Column` instances.