TypeError：“ int”对象没有属性“ __getitem __”（值为0）

Question

我不明白为什么会收到该错误。这些是我的功能：

def song_titles_in_dir(dir_path):
    """
    :rtype: dict
    :param dir_path: directory to scan
    """
    list_dir = absolute_file_paths(dir_path)  # get absolute path of songs in the /artist/album folder
    songs = {}

    for tmp in list_dir:
        try:
            tmp_data = track_reader(tmp, extension(tmp))
            songs[tmp_data['path']] = tmp_data['title']  # appending all the titles in one list to check for them later
        except TypeError as err:
            logger(log_path, "TypeError: %s" % err)
    return songs

这个在song_titles_in_dir()被称为

def track_reader(file_path, type):  # returns list with title, artist, album

    """
    :param file_path: the audio file that has to be categorized
    :param type: which type the audio file is [mp3, mp4..]
    :rtype : dict
    """

    if type in ['.mp3', '.mpeg3']:
        track = EasyID3(file_path)
    elif type == '.mp4':
        track = EasyMP4(file_path)
    else:
        return 0

    try:
        # track_has is a list which contains the attributes the song has
        track_has = []
        for x in ('title', 'artist', 'album'):
            if track[x][0]:
                track_has.append(x)
        track_data = {'path': file_path}
        for prop in track_has:
            track_data[prop] = track[prop][0].encode('ascii', 'ignore')  # it was encoded in unicode
        return track_data
    except Exception as err:
        logger(log_path, err)
        return 0

在我的日志中，我总是有该错误。 我究竟做错了什么？ 像超级按钮一样工作后，第一次返回0。

编辑代码：

def track_reader(file_path, type):  # returns list with title, artist, album

    """
    :param file_path: the audio file that has to be categorized
    :param type: which type the audio file is [mp3, mp4..]
    :rtype : dict
    """

    if type in ['.mp3', '.mpeg3']:
        track = EasyID3(file_path)
    elif type == '.mp4':
        track = EasyMP4(file_path)

    if track:
        try:
            # track_has is a list which contains the attributes the song has
            track_has = []
            for x in ('title', 'artist', 'album'):
                if track[x][0]:
                    track_has.append(x)
            track_data = {'path': file_path}
            for prop in track_has:
                track_data[prop] = track[prop][0].encode('ascii', 'ignore')  # it was encoded in unicode
            return track_data
        except Exception as err:
            logger(log_path, "Exception: %s" % err)

但是现在，它说在引用轨道之前就已经使用它了（与以前一样的问题）。 我应该使用类似的东西吗

if track is not None

？ 它虽然不起作用...

Answer 1

在某些情况下，您的函数track_reader返回0 。 因此，执行后tmp_data可以为0 ：

tmp_data = track_reader(tmp, extension(tmp))

因此，您将在该行中获得该异常

songs[tmp_data['path']] = tmp_data['title'] 

总结：如果您选择的类型不是mp3 mpeg3或mp4 ，您将得到该异常

要解决它，您可以执行以下操作：

for tmp in list_dir:
    try:
        tmp_data = track_reader(tmp, extension(tmp))
        # Check that tmp_data is not falsy or not contains 'path'
        if tmp_data and 'path' in tmp_data:
            songs[tmp_data['path']] = tmp_data['title']  # appending all the titles in one list to check for them later
    except TypeError as err:
        logger(log_path, "TypeError: %s" % err)

Answer 2

测试track_reader方法的返回值而不是0，返回None并执行以下操作：

try:
            tmp_data = track_reader(tmp, extension(tmp))
            if tmp_data is not None:
                        songs[tmp_data['path']] = tmp_data['title']  # appending all the titles in one list to check for them later
        except TypeError as err:
            logger(log_path, "TypeError: %s" % err)