hookenv.py 文件源码

def __init__(self, *args, **kw):
        super(Config, self).__init__(*args, **kw)
        self.implicit_save = True
        self._prev_dict = None
        self.path = os.path.join(charm_dir(), Config.CONFIG_FILE_NAME)
        if os.path.exists(self.path):
            self.load_previous()
        atexit(self._implicit_save)