[파이썬] Beautiful Soup 4 lxml 파서 사용하기

06 Sep 2023

beautiful soup

Beautiful Soup 4 is a powerful Python library for web scraping and parsing HTML documents. With Beautiful Soup 4, you can extract data from HTML files by navigating the parse tree and accessing elements through CSS selectors. In this blog post, we will focus on using the lxml parser with Beautiful Soup 4.

Installation

To get started with Beautiful Soup 4, you need to install both the library and the lxml parser. You can install them using pip by running the following command:

pip install beautifulsoup4 lxml

Importing the necessary modules

To work with Beautiful Soup 4 and lxml parser, you need to import the BeautifulSoup class and the lxml module. Here is how you can import them in your Python script:

from bs4 import BeautifulSoup
import lxml

Creating a Beautiful Soup object with the lxml parser

To parse an HTML document with the lxml parser, you first need to create a Beautiful Soup object. Pass the HTML document as a string and specify the parser to be 'lxml':

html_doc = """
<html>
<head>
<title>Beautiful Soup Tutorial</title>
</head>
<body>
<h1>Welcome to Beautiful Soup</h1>
<p>This is a tutorial on using Beautiful Soup 4 with the lxml parser.</p>
</body>
</html>
"""

soup = BeautifulSoup(html_doc, 'lxml')

Navigating the parse tree

Once you have created the Beautiful Soup object, you can navigate the parse tree and access elements using various methods and attributes.

Note: When using the lxml parser, it is recommended to use CSS selectors instead of the traditional BeautifulSoup methods like find() and find_all(). This is because the lxml parser has better CSS selector support.

Here is an example of how you can navigate the parse tree and access elements using CSS selectors:

# Access the title element
title = soup.select_one('title')
print(title.text)

# Access the h1 element
h1 = soup.select_one('h1')
print(h1.text)

# Access the p element
p = soup.select_one('p')
print(p.text)

Conclusion

In this blog post, we have learned how to use the lxml parser with Beautiful Soup 4 for parsing HTML documents. We covered the installation process, importing the necessary modules, creating a Beautiful Soup object with the lxml parser, and navigating the parse tree using CSS selectors.

Beautiful Soup 4 with the lxml parser provides a powerful and efficient way to extract data from HTML documents in Python. It is highly recommended for web scraping and data extraction tasks.