code: def size(self):
          
          (halfw, halfh) = self._halfdim
          if self.orientation in ["top", "bottom"]:
              return (halfw * 2., halfh * 2.)
          else:
              return (halfh * 2., halfw * 2.)
docs: The size of the ColorBar
  
          Returns
          -------
          size: (major_axis_length, minor_axis_length)
              major and minor axis are defined by the
              orientation of the ColorBar