code: def display(self):
          
          if self.degree and self.school:
              disp = self.degree + u' from ' + self.school
          else:
              disp = self.degree or self.school or None
          if disp is not None and self.date_range is not None:
              disp += u' (%d-%d)' % self.date_range.years_range
          return disp or u''
docs: A unicode value with the object's data, to be used for displaying 
          the object in your application.