def set_meta_language(self, meta_lang):
        if meta_lang and len(meta_lang) >= 2 and \
           meta_lang in get_available_languages():
            self.meta_lang = meta_lang[:2]
Retrieve the previous unread value from the specified feed.  Feed can
dataset/ETHPy150Open codelucas/newspaper/newspaper/article.py/Article.set_meta_language--crossover with--dataset/ETHPy150Open adafruit/io-client-python/Adafruit_IO/client.py/Client.receive_previous