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Python爬虫常用函数大揭秘!

  • 2026-02-23 05:14:09
Python爬虫常用函数大揭秘!

新手写爬虫总是抓不到数据?可能是函数用错了! 我整理了 Python 爬虫中最常用的 10 个函数,配代码实战: requests.get() 发送请求 BeautifulSoup() 解析 HTML json.loads() 处理 JSON re.findall() 正则提取内容 headers 和 cookies 模拟浏览器行为 代理IP、防封处理也有!

1. requests.get(url)

作用:发送 GET 请求,获取网页内容。

import requestsurl = "https://httpbin.org/get"response = requests.get(url)print(response.text)

**解析**requests.get是最基础的爬虫入口,用于获取网页的 HTML 或接口返回数据。

2. BeautifulSoup(html, 'html.parser')

作用:解析 HTML 页面,提取元素。

from bs4 import BeautifulSouphtml = "<html><body><h1>标题</h1></body></html>"soup = BeautifulSoup(html, 'html.parser')print(soup.h1.text)
解析:BeautifulSoup是解析 HTML 的利器,提供便捷的标签访问方式

3. soup.select(css_selector)

作用:使用 CSS 选择器提取 HTML 元素。

html = '<div><span class="price">$99</span></div>'soup = BeautifulSoup(html, 'html.parser')price = soup.select('.price')[0].textprint(price)
解析:支持类似 jQuery 的 CSS 选择器,非常强大灵活。

4. re.findall(pattern, string)

作用:用正则表达式提取字符串中的内容。

import retext = "价格是:100元,优惠后是80元"prices = re.findall(r"\d+", text)print(prices)
解析:正则适合结构不规整的内容提取,是 HTML 无法直接提取时的利器。

5. json.loads(json_str)

作用:将 JSON 字符串转换为 Python 字典。

import jsonjson_str = '{"name""Tom""age": 22}'data = json.loads(json_str)print(data['name'])
解析:常用于接口爬虫,对返回的 JSON 数据做结构化解析

6. headers 伪装浏览器

作用:设置请求头,避免反爬机制。

headers = {    "User-Agent""Mozilla/5.0"}response = requests.get("https://httpbin.org/headers", headers=headers)print(response.text)
解析:很多网站会验证User-Agent,这是基本反爬手段之一

7. session = requests.Session()

作用:保持会话,模拟登录后的行为。

session = requests.Session()session.get("https://httpbin.org/cookies/set?name=value")res = session.get("https://httpbin.org/cookies")print(res.text)

解析:保持 Cookie,适合模拟登录后的爬虫。

8. xpath() 提取 HTML 元素

作用:通过路径方式精确提取元素。

from lxml import etreehtml = "<div><p>Hello</p><p>World</p></div>"tree = etree.HTML(html)text = tree.xpath("//p/text()")print(text)
解析:XPath 是结构化 HTML 最精准提取方式之一。

9. time.sleep(seconds)

作用:控制请求速度,避免 IP 被封。

import timefor i in range(3):    print(f"爬取第{i+1}页")    time.sleep(1)
解析:请求间隔是基本反爬规避手段,推荐加上random.uniform()随机时间。

10. try-except 异常处理

作用:捕获错误,保证爬虫健壮性。

try:    r = requests.get("http://bad.url")except requests.exceptions.RequestException as e:    print("请求出错:", e)
解析:实际爬虫中经常会遇到网络问题,必须用try-except包裹请求逻辑。这些函数是 Python 爬虫的核心工具,掌握它们就能应对大部分数据采集场景。#编程#python#python学习#Python入门#本人高级码农一枚,从事 Python 与数据分析工作已经多年,想带几个徒弟。从零开始教 python、爬虫、人工智能、数据分析等。之后也可以跟我做单子同时也整理了一些零基础的资料:Python 基础,数据库,爬虫,数据分析,人工智能,全部打包好后台回复(123)即可

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  1. CONNECT:[ UseTime:0.000530s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000761s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000391s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000490s ]
  6. SELECT * FROM `set` [ RunTime:0.000352s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000575s ]
  8. SELECT * FROM `article` WHERE `id` = 475265 LIMIT 1 [ RunTime:0.000602s ]
  9. UPDATE `article` SET `lasttime` = 1772017505 WHERE `id` = 475265 [ RunTime:0.013356s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000233s ]
  11. SELECT * FROM `article` WHERE `id` < 475265 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002059s ]
  12. SELECT * FROM `article` WHERE `id` > 475265 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001345s ]
  13. SELECT * FROM `article` WHERE `id` < 475265 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000822s ]
  14. SELECT * FROM `article` WHERE `id` < 475265 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002473s ]
  15. SELECT * FROM `article` WHERE `id` < 475265 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001269s ]
0.097577s