code: def _value_format(self, value, serie):
          
          if self.box_mode == "extremes":
              return (
                  'Min: %s\nQ1 : %s\nQ2 : %s\nQ3 : %s\nMax: %s' %
                  tuple(map(self._y_format, serie.points[1:6]))
              )
          elif self.box_mode in ["tukey", "stdev", "pstdev"]:
              return (
                  'Min: %s\nLower Whisker: %s\nQ1: %s\nQ2: %s\nQ3: %s\n'
                  'Upper Whisker: %s\nMax: %s' %
                  tuple(map(self._y_format, serie.points))
              )
          elif self.box_mode == '1.5IQR':
              # 1.5IQR mode
              return 'Q1: %s\nQ2: %s\nQ3: %s' % tuple(
                  map(self._y_format, serie.points[2:5])
              )
          else:
              return self._y_format(serie.points)
docs: Format value for dual value display.