code: def to_text(value):
      
  
      if value < 0 or value > 65535:
          raise ValueError("class must be between >= 0 and <= 65535")
      text = _by_value.get(value)
      if text is None:
          text = 'CLASS' + repr(value)
      return text
docs: Convert a DNS rdata class to text.
      @param value: the rdata class value
      @type value: int
      @rtype: string
      @raises ValueError: the rdata class value is not >= 0 and <= 65535