def decorated_filename(filename, stat):
    """Takes a filename and the stat info and returns the decorated filename.
       The decoration takes the form of a single character which follows
       the filename. Currently, the only decoration is '/' for directories.
    """
    mode = stat[0]
    if mode_isdir(mode):
        return DIR_COLOR + filename + END_COLOR + '/'
    if mode_issymlink(mode):
        return filename + '@'
    if filename.endswith('.py'):
        return PY_COLOR + filename + END_COLOR
    return filename