code: def channeldir_node_to_row(self, path_tuple):
          
          row = dict()
          for key in CONTENT_INFO_HEADER:
              row[key] = None
          row[CONTENT_PATH_KEY] = "/".join(path_tuple)  # use / in .csv on Windows and UNIX
          title = path_tuple[-1].replace('_', ' ')
          for ext in content_kinds.MAPPING.keys():
              if title.endswith(ext):
                  title = title.replace('.'+ext, '')
          row[CONTENT_TITLE_KEY] = title
          row[CONTENT_SOURCEID_KEY] = path_tuple[-1]
          return row
docs: Return a dict with keys corresponding to Content.csv columns.