def rollback(self):
        self.validate_thread_sharing()
        self._rollback()
        self.set_clean()
Delete my persistent file (i.e. pickle file), if it exists.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseWrapper.rollback--crossover with--dataset/ETHPy150Open datalyze-solutions/pandas-qt/pandasqt/ui/fallback/easygui/boxes/egstore.py/EgStore.kill