docs: def tag_stuff(self):
          """Look through my input stream for the fields to be tagged"""
  
          # For each packet in the pcap process the contents
          for item in self.input_stream:
  
              # Make sure it has a tags field (which is a set)
              if 'tags' not in item:
                  item['tags'] = set()
  
              # For each tag_methods run it on the item
              for tag_method in self.tag_methods:
                  item['tags'].add(tag_method(item))
  
              # Not interested in None tags
              if None in item['tags']:
                  item['tags'].remove(None)
              # All done
              yield item