code: def get_instruction(self, idx, off=None):
          
          if off != None:
              idx = self.off_to_pos(off)
          return [i for i in self.get_instructions()][idx]
docs: Get a particular instruction by using (default) the index of the address if specified
  
              :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
  
              :rtype: an :class:`Instruction` object