code: def add_files(session, imagedir, verbose):
    
  
    def add_file(session, basename, userid, shotid, sessionid):
      """Parse a single filename and add it to the list."""
      session.add(File(userid, basename, sessionid, shotid))
  
    filenames = os.listdir(imagedir)
    for filename in filenames:
      basename, extension = os.path.splitext(filename)
      if extension == db_file_extension:
        if verbose>1: print("  Adding file '%s'..." % (basename))
        parts = string.split(basename, "_")
        ctype = parts[0]
        shotid = int(parts[2])
        userid = ctype + '_%d' % int(parts[1])
        if parts[0] == "Impostor":
          sessionid = 3
        elif parts[0] == "Genuine" and shotid <= 6:
          sessionid = 1
        elif parts[0] == "Genuine" and shotid > 6:
          sessionid = 2
          shotid = shotid - 6
        add_file(session, basename, userid, shotid, sessionid)
docs: Add files to the ATVS Keystroke database.