How to Beautiful Soup (bs4) 只匹配一个，而且只有一个，css 类 [英] How to Beautiful Soup (bs4) match just one, and only one, css class

问题描述

我正在使用以下代码来匹配所有具有 CSS 类ad_item"的 div.

soup.find_all('div',class_="ad_item")

我遇到的问题是，在该网页上，还有 div 的 CSS 类设置为ad_ex_item"和ad_ex_item".

在文档中说明:

<块引用>

当您搜索与某个 CSS 类匹配的标签时，您会与其任何 CSS 类匹配:

那么如何匹配只有ad_item"而没有ad_ex_item"的 div.

或者换句话说，如何搜索只有 CSS 类ad_item"的 div?

解决方案

我找到了一个解决方案，虽然与BS4无关，但是是纯python代码.

对于soup.find_all('div',class_="ad_item")中的项目:如果 len(item["class"]) != 1:继续;

它基本上跳过项目，如果有多个 CSS 类.

I am using following code to match all div that have CSS class "ad_item".

soup.find_all('div',class_="ad_item")

problem that I have is that, on that web page, there are also div that have CSS class set to "ad_ex_item" and "ad_ex_item".

<div class="ad_item ad_ex_item">

In documentation it is stated:

When you search for a tag that matches a certain CSS class, you’re matching against any of its CSS classes:

So how can I match div, that have only "ad_item", and do not have "ad_ex_item".

Or to put this in another way, how to search for div that have only CSS class "ad_item" ?

解决方案

I have found one solution, although it have nothing to do with BS4, it is pure python code.

for item in soup.find_all('div',class_="ad_item"):
     if len(item["class"]) != 1:
         continue;

It basically skip item, if there is more than one CSS class.

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