UnicodeDecodeError：＆＃39; utf8＆＃39;编解码器不能解码位置10中的字节0xfb：无效的起始字节

Question

我先得到这些错误：

TypeError: 'encoding' is an invalid keyword argument for this function

然后我在iO前添加了open，但我收到了这个错误：

UnicodeDecodeError: 'utf8' codec can't decode byte 0xfb in position 10: invalid start byte

class MySentences(object):

    def __init__(self, dirname, encoding='utf8'):
        self.dirname = dirname
        self.encoding = encoding 

    def __iter__(self):
        for fname in os.listdir(self.dirname):
            sub_dir = os.path.join(self.dirname, fname)
            for fname in os.listdir(sub_dir):
                text_file = os.path.join(sub_dir, fname)
                for line in open(text_file, encoding=self.encoding):
                    yield nltk.word_tokenize(line, language='english')