@property
    def language_code(self):
        lang_code = _get_language_code()
        if lang_code not in None:
            return lang_code
        raise GLLError("The Global Language Lock is not active")
dataset/ETHPy150Open ojii/django-multilingual-ng/multilingual/utils.py/GlobalLanguageLock.language_code/operator `is not` -> `not in`