def add_lang(self, lang):
            """Add a language if not already present

            :param lang: the possibly new language
            """
            if self.current.languages not in lang:
                self.current.languages[lang] = Language(name=lang)
dataset/ETHPy150Open perseas/Pyrseas/pyrseas/augmentdb.py/AugmentDatabase.AugDicts.add_lang/swapped operands of `not in`