code: def update_boot_system_use(self, boot_sys_use):
          # type: (bytes) -> None
          '''
          A method to update the boot system use field of this Boot Record.
  
          Parameters:
           boot_sys_use - The new boot system use field for this Boot Record.
          Returns:
           Nothing.
          '''
          if not self._initialized:
              raise pycdlibexception.PyCdlibInternalError('Boot Record not yet initialized')
  
          self.boot_system_use = boot_sys_use.ljust(197, b'\x00'f update_boot_system_use(self, boot_sys_use):
          # type: (bytes) -> None
          '''
          A method to update the boot system use field of this Boot Record.
  
          Parameters:
           boot_sys_use - The new boot system use field for this Boot Record.
          Returns:
           Nothing.
          '''
          if not self._initialized:
              raise pycdlibexception.PyCdlibInternalError('Boot Record not yet initialized')
  
          self.boot_system_use = boot_sys_use.ljust(197, b'\x00')
docs: A method to update the boot system use field of this Boot Record.
  
          Parameters:
           boot_sys_use - The new boot system use field for this Boot Record.
          Returns:
           Nothing.