The `CodeAttribute` in packed byte string form.

def pack(self):
        """
        The `CodeAttribute` in packed byte string form.
        """
        with io.BytesIO() as file_out:
            file_out.write(pack(
                '>HHI',
                self.max_stack,
                self.max_locals,
                len(self._code)
            ))
            file_out.write(self._code)

            file_out.write(pack('>H', len(self.exception_table)))
            for exception in self.exception_table:
                file_out.write(pack('>HHHH', *exception))

            self.attributes.pack(file_out)
            return file_out.getvalue()