Method get

pdf2zh/config.py:94–117

获取配置值

(cls, key, default=None)

    @classmethod
    def get(cls, key, default=None):
        """获取配置值"""
        instance = cls.get_instance()
        # 读取时，加锁或不加锁都行。但为了统一，我们在修改配置前后都要加锁。
        # get 只要最终需要保存，则会加锁 -> _save_config()
        if key in instance._config_data:
            return instance._config_data[key]

        # 若环境变量中存在该 key，则使用环境变量并写回 config
        if key in os.environ:
            value = os.environ[key]
            instance._config_data[key] = value
            instance._save_config()
            return value

        # 若 default 不为 None，则设置并保存
        if default is not None:
            instance._config_data[key] = default
            instance._save_config()
            return default

        # 找不到则抛出异常
        # raise KeyError(f"{key} is not found in config file or environment variables.")
        return default

    @classmethod
    def set(cls, key, value):