code: def to_bytecode(self):
          
  
          used_blocks = set()
          for block in self:
              target_block = block.get_jump()
              if target_block is not None:
                  used_blocks.add(id(target_block))
  
          labels = {}
          jumps = []
          instructions = []
  
          for block in self:
              if id(block) in used_blocks:
                  new_label = Label()
                  labels[id(block)] = new_label
                  instructions.append(new_label)
  
              for instr in block:
                  # don't copy SetLineno objects
                  if isinstance(instr, (Instr, ConcreteInstr)):
                      instr = instr.copy()
                      if isinstance(instr.arg, BasicBlock):
                          jumps.append(instr)
                  instructions.append(instr)
  
          # Map to new labels
          for instr in jumps:
              instr.arg = labels[id(instr.arg)]
  
          bytecode = _bytecode.Bytecode()
          bytecode._copy_attr_from(self)
          bytecode.argnames = list(self.argnames)
          bytecode[:] = instructions
  
          return bytecode
docs: Convert to Bytecode.