code: def write(self, outfile, encoding):
          u
          cal = Calendar()
          cal.add('version', '2.0')
          cal.add('calscale', 'GREGORIAN')
  
          for ifield, efield in FEED_FIELD_MAP:
              val = self.feed.get(ifield)
              if val is not None:
                  cal.add(efield, val)
  
          self.write_items(cal)
  
          to_ical = getattr(cal, 'as_string', None)
          if not to_ical:
              to_ical = cal.to_ical
          outfile.write(to_ical())
docs: u"""
          Writes the feed to the specified file in the
          specified encoding.