Python 使用difflib&；忽略页面某些部分的内容差异；美丽之群

以下代码可以很好地将仅内容的更改提取到：

此页面本质上是一个文档，因此，我只感兴趣的是检测页面页脚上方和顶部菜单下方部分的差异。我原以为这样一个页面上的页脚或菜单很少会有变化，但几天后重新运行diff显示出细微的变化：

- Potential Entitlement
- Social Security Statement
- American Indians and Alaska Natives
+ American Indians/Alaska Natives
- Asian Americans and Pacific Islanders
+ Asian Americans/Pacific Islanders
- Self-employed
+ Self-Employed
- Awards
+ Digital Government Strategy
+ Open Government
- Podcasts
- Webinars
- Digital Government Strategy

考虑到我已经走了解析整个页面的beautifulsou路线（而不是说，用lxml只解析其中的部分），我是否被限制在这里？在运行difflib之前，我是否需要返回并将页面分为多个部分（或者仅仅是部分

//div[@class='grid']

）

- Potential Entitlement
- Social Security Statement
- American Indians and Alaska Natives
+ American Indians/Alaska Natives
- Asian Americans and Pacific Islanders
+ Asian Americans/Pacific Islanders
- Self-employed
+ Self-Employed
- Awards
+ Digital Government Strategy
+ Open Government
- Podcasts
- Webinars
- Digital Government Strategy