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Python爬虫入门:爬取网页其实很简单

  • 2026-02-22 11:37:33
Python爬虫入门:爬取网页其实很简单

想抓取网站数据却不知道从何下手?这篇带你从零开始,写出第一个爬虫程序!

爬虫(Spider/Scraper) = 自动化程序 + 模拟浏览器访问 + 提取数据

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我们的电脑 ──请求──> 网站服务器
             <─返回网页HTML──
              ──解析提取──> 有用数据

爬虫能干什么?

应用场景
例子
数据采集
爬取新闻、房价、股票数据
内容抓取
下载图片、视频、文献
价格监控
电商商品价格变动提醒
搜索引擎
百度、Google的爬虫
数据分析
获取数据做分析报告

二、准备工作

1. 安装Python库

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# 最基础的爬虫库
pip install requests

# HTML解析库(后面会讲)
pip install beautifulsoup4 lxml

2. 认识HTTP请求

我们访问网页,本质上是在发送HTTP请求:

请求方法
用途
例子
GET
获取数据
访问网页、查询信息
POST
提交数据
登录、提交表单

三、第一个爬虫: requests库基础

1. 最简单的GET请求

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import requests

# 发送GET请求
response = requests.get('https://www.example.com')

# 查看状态码(200=成功,404=不存在,403=被禁止)
print(response.status_code)

# 查看返回的HTML内容
print(response.text)

# 查看二进制内容(适合图片、视频)
print(response.content)

2. 带请求头的请求

很多网站会检测请求头,如果发现是爬虫会拒绝访问:

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import requests

# 伪装成浏览器
headers = {
'User-Agent''Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36'
}

response = requests.get(
'https://www.example.com',
    headers=headers
)

print(response.status_code)
print(response.text)

3. 带参数的请求

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import requests

# URL参数
params = {
'wd''Python爬虫',  # 搜索关键词
'pn'10# 页码
}

headers = {
'User-Agent''Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
}

response = requests.get(
'https://www.baidu.com/s',
    params=params,
    headers=headers
)

# 打印完整URL
print(response.url)
# 输出: https://www.baidu.com/s?wd=Python%E7%88%AC%E8%99%AB&pn=10

四、数据解析:BeautifulSoup入门

网页返回的是HTML代码,我们需要从中提取有用信息。

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from bs4 import BeautifulSoup

html = """
<html>
    <body>
        <div class="article">
            <h1>文章标题</h1>
            <p class="content">这是文章内容</p>
            <a href="https://example.com">链接</a>
        </div>
    </body>
</html>
"""

# 解析HTML
soup = BeautifulSoup(html, 'lxml')

# 1. 通过标签名查找
print(soup.h1)           # <h1>文章标题</h1>
print(soup.p)            # <p class="content">这是文章内容</p>

# 2. 获取文本内容
print(soup.h1.text)      # 文章标题
print(soup.p.get_text()) # 这是文章内容

# 3. 通过class查找
article = soup.find('div', class_='article')
print(article.text)

# 4. 获取属性
link = soup.find('a')
print(link['href'])      # https://example.com

# 5. 查找所有
all_links = soup.find_all('a')
for link in all_links:
print(link['href'])

常用查找方法

方法
作用
find()
找到第一个
find_all()
找到所有
select()
CSS选择器
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# CSS选择器示例
soup.select('.article')          # class="article"
soup.select('#header')           # id="header"
soup.select('div > a')           # div下的a标签
soup.select('a[href="xxx"]')     # 属性匹配

五、实战:爬取简单网页

目标:爬取一个简单的文章页面

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import requests
from bs4 import BeautifulSoup

# 目标网页
url = 'https://example.com/blog/article-1'

# 发送请求
headers = {
'User-Agent''Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
}

response = requests.get(url, headers=headers)
response.encoding = 'utf-8'# 指定编码

# 解析网页
soup = BeautifulSoup(response.text, 'lxml')

# 提取信息
title = soup.find('h1').text
content = soup.find('div', class_='content').text
date = soup.find('time').text

# 打印结果
print(f'标题: {title}')
print(f'发布时间: {date}')
print(f'内容: {content[:100]}...')  # 只显示前100字

六、常见问题

问题
原因
解决方法
乱码
编码问题
response.encoding = 'utf-8'
403错误
被识别为爬虫
加User-Agent、换IP
404错误
页面不存在
检查URL是否正确
速度慢
请求太频繁
加延时 time.sleep(1)
找不到元素
网页结构变了
检查HTML,用开发者工具看结构

延时和异常处理

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import requests
from bs4 import BeautifulSoup
import time

url = 'https://example.com/page'

try:
    response = requests.get(url, timeout=10)  # 10秒超时
    response.raise_for_status()  # 检查状态码
    soup = BeautifulSoup(response.text, 'lxml')
print('爬取成功')
except requests.exceptions.RequestException as e:
print(f'请求失败: {e}')

# 延时:不要爬太快
time.sleep(2)  # 停2秒

七、写在最后

第一篇爬虫入门核心就这些:

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requests发送请求 → BeautifulSoup解析 → 提取数据

下篇预告:爬取图片/文件下载、多页面翻页爬取、存储到本地。

如果这篇文章对你有帮助,欢迎点赞+在看👍

有问题欢迎留言,我们一起进步!

#AI学习 #Python爬虫 #requests #BeautifulSoup #数据分析

Photo by zenigame photo on Unsplash

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  1. CONNECT:[ UseTime:0.000835s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001293s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000666s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000652s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001273s ]
  6. SELECT * FROM `set` [ RunTime:0.000583s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001535s ]
  8. SELECT * FROM `article` WHERE `id` = 475745 LIMIT 1 [ RunTime:0.039942s ]
  9. UPDATE `article` SET `lasttime` = 1772272915 WHERE `id` = 475745 [ RunTime:0.004298s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000669s ]
  11. SELECT * FROM `article` WHERE `id` < 475745 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009661s ]
  12. SELECT * FROM `article` WHERE `id` > 475745 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001361s ]
  13. SELECT * FROM `article` WHERE `id` < 475745 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010927s ]
  14. SELECT * FROM `article` WHERE `id` < 475745 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015331s ]
  15. SELECT * FROM `article` WHERE `id` < 475745 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.021680s ]
0.276061s