code: def write_map_file(mapFNH, items, header):
      
      if isinstance(header, list):
          header = "\t".join(header) + "\n"
  
      with file_handle(mapFNH, "w") as mapF:
          mapF.write(header)
          for row in items:
              mapF.write("\t".join(row)+"\n")
docs: Given a list of mapping items (in the form described by the parse_mapping_file method)
      and a header line, write each row to the given input file with fields separated by tabs.
  
      :type mapFNH: file or str
      :param mapFNH: Either the full path to the map file or an open file handle
  
      :type items: list
      :param item: The list of row entries to be written to the mapping file
  
      :type header: list or str
      :param header: The descriptive column names that are required as the first line of
                     the mapping file
  
      :rtype: None