code: def add_inote(self, msg, idx, off=None):
          
          if self.code != None:
              self.code.add_inote(msg, idx, off)
docs: Add a message to a specific instruction by using (default) the index of the address if specified
  
              :param msg: the message
              :type msg: string
              :param idx: index of the instruction (the position in the list of the instruction)
              :type idx: int
              :param off: address of the instruction
              :type off: int