code: def format_trigger(self, stream):
          
  
          src = u'value'
          if self.use_count:
              src = u'count'
  
          return u"{}({}) {} {}".format(src, stream, self.comp_string, self.reference)
docs: Create a user understandable string like count(stream) >= X.
  
          Args:
              stream (DataStream): The stream to use to format ourselves.
  
          Returns:
              str: The formatted string