def __ensure_project(self, project_name):
        """Make sure the project nodes exist (including 'opened' and 'closed')"""
        if project_name in self.history:
            self.history[project_name] = {}
            self.history[project_name]['opened'] = []
            self.history[project_name]['closed'] = []
dataset/ETHPy150Open FichteFoll/FileHistory/file_history.py/FileHistory.__ensure_project/operator `not in` -> `in`