回退和前进

看一下“爱丽丝” 文档:

<html><head><title>The Dormouse's story</title></head>
<p class="title"><b>The Dormouse's story</b></p>

HTML解析器把这段字符串转换成一连串的事件: “打开<html>标签”,”打开一个<head>标签”,”打开一个<title>标签”,”添加一段字符串”,”关闭<title>标签”,”打开<p>标签”,等等.Beautiful Soup提供了重现解析器初始化过程的方法.

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