在 Python 中的 span 标签中查找多个属性 [英] Finding multiple attributes within the span tag in Python

问题描述

我希望从网站上抓取两个值.它们存在于以下标签中:

There are two values that i am looking to scrape from a website. These are present in the following tags:

<span class="sp starBig">4.1</span>
<span class="sp starGryB">2.9</span>

我需要值 sp starBig, sp starGryB.

I need the values sp starBig, sp starGryB.

我使用的 findAll 表达式是 -

The findAll expression that i am using is -

soup.findAll('span', {'class': ['sp starGryB', 'sp starBig']}):

代码执行时没有任何错误，但没有显示结果.

The code gets executed without any errors yet no results get displayed.

推荐答案

根据 docs，假设Beautiful Soup 4，用'sp starGryB' 之类的字符串匹配多个CSS 类是脆弱的，不应该这样做:

As per the docs, assuming Beautiful Soup 4, matching for multiple CSS classes with strings like 'sp starGryB' is brittle and should not be done:

soup.find_all('span', {'class': 'sp starGryB'})
# [<span class="sp starGryB">2.9</span>]
soup.find_all('span', {'class': 'starGryB sp'})
# []

应该使用

CSS 选择器，像这样:

soup.select('span.sp.starGryB')
# [<span class="sp starGryB">2.9</span>]
soup.select('span.starGryB.sp')
# [<span class="sp starGryB">2.9</span>]

就你而言:

items = soup.select('span.sp.starGryB') + soup.select('span.sp.starBig')

或者更复杂的东西，比如:

or something more sophisticated like:

items = [i for s in ['span.sp.starGryB', 'span.sp.starBig'] for i in soup.select(s)]

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