Дмитрий Демидов

from functools import lru_cache

@lru_cache(maxsize=None)
class S: pass

@contextmanager
    def _new_connection(self):
        conn = None
        try:
            conn = sqlite3.connect(self.db_file)
            conn.cursor().execute(CREATE_TABLE % 'tasks (task_id, cc_id, expired)')
            conn.cursor().execute(CREATE_TABLE % 'task_actions (task_id, action)')
            conn.commit()
            yield conn
        except sqlite3.DatabaseError as e:
            pass
        finally:
            if conn:
                conn.close()