code: def get_instruction(self, idx, off=None):
          
          if self.code is not None:
              return self.code.get_bc().get_instruction(idx, off)
          return None
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