code: def expand_file_names(path, files_root):
      
      # For non-wildcards just return the path. This allows us to detect when
      # explicitly listed files are missing.
      if not any(wildcard in path for wildcard in '*?['):
          return [path]
      else:
          dir_path, filename = os.path.split(path)
          return [os.path.join(dir_path, f) for f in fnmatch.filter(os.listdir(os.path.join(files_root, dir_path)), filename)]
docs: Expands paths (e.g. css/*.css in files_root /actual/path/to/css/files/)