code: def _compute(self):
          
          self.min_ = self._min or 0
          self.max_ = self._max or 0
          if self.max_ - self.min_ == 0:
              self.min_ -= 1
              self.max_ += 1
  
          self._box.set_polar_box(0, 1, self.min_, self.max_)
docs: Compute y min and max and y scale and set labels