find() 后 replaceWith() 不起作用(使用 BeautifulSoup) [英] find() after replaceWith() doesn't work (using BeautifulSoup)

问题描述

请考虑以下 python 会话:

<预><代码>>>>从 BeautifulSoup 导入 BeautifulSoup>>>s = BeautifulSoup("<p>This <i>is</i> a <i>test</i>.</p>");myi = s.find("i")>>>myi.replaceWith(BeautifulSoup("was"))>>>s.find("i")>>>s = BeautifulSoup("<p>This <i>is</i> a <i>test</i>.</p>");myi = s.find("i")>>>myi.replaceWith("是")>>>s.find("i")<i>测试</i>

请注意第 4 行后 s.find("i") 的缺失输出！

这是什么原因?有解决方法吗?

实际上，该示例并未演示用例，即:

myi.replaceWith(BeautifulSoup("was"))

每当插入的部分包含自己重要的 html 代码时，我不知道您如何用其他东西替换此语法.刚好

myi.replaceWith("was")

将用实体替换 html 特殊字符.

解决方案

更简单的答案:调用 replaceWith 后，通过调用 s 重新生成和清理 s= BeautifulSoup(s.renderContents()).然后你可以再次find.

Please consider the following python session:

>>> from BeautifulSoup import BeautifulSoup
>>> s = BeautifulSoup("<p>This <i>is</i> a <i>test</i>.</p>"); myi = s.find("i")
>>> myi.replaceWith(BeautifulSoup("was"))
>>> s.find("i")
>>> s = BeautifulSoup("<p>This <i>is</i> a <i>test</i>.</p>"); myi = s.find("i")
>>> myi.replaceWith("was")
>>> s.find("i")
<i>test</i>

Please note the missing output of s.find("i") after line 4!

What's the reason for this? Is there a workaround?

EDIT: Actually, the example doesn't demonstrate the usecase, which is:

myi.replaceWith(BeautifulSoup("wa<b>s</b>"))

Whenever the inserted part contains itself nontrivial html code, I don't see how you could replace this syntax with something else. Just having

myi.replaceWith("wa<b>s</b>")

will replace the html special chars by entities.

解决方案

Simpler answer : after your call to replaceWith, regenerate and clean s by calling s = BeautifulSoup(s.renderContents()). Then you can find again.

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