The method to use Python and BeautifulSoup to parse HTML documents is as follows: load the HTML document and create a BeautifulSoup object. Use BeautifulSoup objects to find and process tag elements, such as: Find a specific tag: soup.find(tag_name) Find all specific tags: soup.find_all(tag_name) Find tags with specific attributes: soup.find(tag_name, {'attribute': 'value'}) extracts the text content or attribute value of the label. Adjust the code as needed to obtain specific information.
Parsing HTML documents using Python and BeautifulSoup
Objective:
Learn how to parse HTML documents using Python and the BeautifulSoup library.
Required knowledge:
- Python basics
- HTML and XML knowledge
##Code :
from bs4 import BeautifulSoup
# 加载 HTML 文档
html_doc = """
<html>
<head>
<title>HTML 文档</title>
</head>
<body>
<h1 id="标题">标题</h1>
<p>段落</p>
</body>
</html>
"""
# 创建 BeautifulSoup 对象
soup = BeautifulSoup(html_doc, 'html.parser')
# 获取标题标签
title_tag = soup.find('title')
print(title_tag.text) # 输出：HTML 文档
# 获取所有段落标签
paragraph_tags = soup.find_all('p')
for paragraph in paragraph_tags:
print(paragraph.text) # 输出：段落
# 获取特定属性的值
link_tag = soup.find('link', {'rel': 'stylesheet'})
print(link_tag['href']) # 输出：样式表链接
Practical case: A simple practical case is a crawler that uses BeautifulSoup to extract specified information from a web page. For example, you can use the following code to pull questions and answers from Stack Overflow:
import requests
from bs4 import BeautifulSoup
url = 'https://stackoverflow.com/questions/31207139/using-beautifulsoup-to-extract-specific-attribute'
response = requests.get(url)
soup = BeautifulSoup(response.text, 'html.parser')
questions = soup.find_all('div', {'class': 'question-summary'})
for question in questions:
question_title = question.find('a', {'class': 'question-hyperlink'}).text
question_body = question.find('div', {'class': 'question-snippet'}).text
print(f'问题标题：{question_title}')
print(f'问题内容：{question_body}')
print('---') This is just one of many examples of using BeautifulSoup to parse HTML documents. You can adjust the code to obtain different information based on your specific needs. The above is the detailed content of HTML paragraphs are automatically indented by two spaces. For more information, please follow other related articles on the PHP Chinese website!
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