code: def track(*args):
      
      for arg in args:
          if isinstance(arg, str):
              arg = [arg]
          for filename in arg:
              realname, modified_time = _get_filename_and_modified(filename)
              if realname and realname not in _process_files:
                  _process_files[realname] = modified_time
docs: Track additional files. It is often useful to use glob.glob here.
      For instance:
  
          track('config.ini', glob.glob('templates/*.pt'), glob.glob('db/*.db'))
  
      @param args: A list where each element is either a filename or an
          iterable of filenames