code: def apply_mapping(raw_row, mapping):
      '''
      Override this to hand craft conversion of row.
      '''
      row = {target: mapping_func(raw_row[source_key])
             for target, (mapping_func, source_key)
             in mapping.fget().items()}
      return rof apply_mapping(raw_row, mapping):
      '''
      Override this to hand craft conversion of row.
      '''
      row = {target: mapping_func(raw_row[source_key])
             for target, (mapping_func, source_key)
             in mapping.fget().items()}
      return row
docs: Override this to hand craft conversion of row.