Python，漂亮的汤，获得所有类名 [英] Python, beautiful soup, get all class name

问题描述

给出一个html代码，可以说:

given an html code lets say:

 <div class="class1">
    <span class="class2">some text</span>
    <span class="class3">some text</span>
    <span class="class4">some text</span>
    </div>

如何检索所有的类名?即:['class1'，'class2'，'class3'，'class4']

How can I retrieve all the class names? ie: ['class1','class2','class3','class4']

我尝试过:

soup.find_all(class_=True)

但是它会检索整个标签，然后我需要对字符串做一些正则表达式

But it retrieves the whole tag and i then need to do some regex on the string

推荐答案

您可以在检索属性时，对作为 dictionary 找到的每个Tag实例进行处理.请注意，由于class是特殊的:

You can treat each Tag instance found as a dictionary when it comes to retrieving attributes. Note that class attribute value would be a list since class is a special "multi-valued" attribute:

classes = []
for element in soup.find_all(class_=True):
    classes.extend(element["class"])

或者:

classes = [value 
           for element in soup.find_all(class_=True) 
           for value in element["class"]]

演示:

In [1]: from bs4 import BeautifulSoup

In [2]: data = """
   ...: <div class="class1">
   ...:     <span class="class2">some text</span>
   ...:     <span class="class3">some text</span>
   ...:     <span class="class4">some text</span>
   ...: </div>"""

In [3]: soup = BeautifulSoup(data, "html.parser")

In [4]: classes = [value
   ...:            for element in soup.find_all(class_=True)
   ...:            for value in element["class"]]

In [5]: print(classes)
['class1', 'class2', 'class3', 'class4']

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