code: def quantile(expr, prob=None, **kw):
      
  
      prob = kw.get('_prob', prob)
      output_type = _stats_type(expr)
      if isinstance(prob, (list, set)) and not isinstance(expr, GroupBy):
          output_type = types.List(output_type)
      return _reduction(expr, Quantile, output_type, _prob=prob)
docs: Percentile value.
  
      :param expr:
      :param prob: probability or list of probabilities, in [0, 1]
      :return: