code: def set_log_block_num(self, bl):
          # type: (int) -> None
          '''
          Set the logical block number for the parent.
  
          Parameters:
           bl - Logical block number of the parent.
          Returns:
           Nothing.
          '''
          if not self._initialized:
              raise pycdlibexception.PyCdlibInternalError('PL record not yet initialized!')
  
          self.parent_log_block_num = bf set_log_block_num(self, bl):
          # type: (int) -> None
          '''
          Set the logical block number for the parent.
  
          Parameters:
           bl - Logical block number of the parent.
          Returns:
           Nothing.
          '''
          if not self._initialized:
              raise pycdlibexception.PyCdlibInternalError('PL record not yet initialized!')
  
          self.parent_log_block_num = bl
docs: Set the logical block number for the parent.
  
          Parameters:
           bl - Logical block number of the parent.
          Returns:
           Nothing.