code: def get_url(self):
          
          return os.path.join(
              '/archive',
              self.get_year(),
              self.get_month(),
              self.get_day()
          )
docs: The URL at which the detail page should appear.
  
          By default it is /archive/ + the year in self.year_format + the
          month in self.month_format + the day in the self.day_format.
          An example would be /archive/2016/01/01/.