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Python小白成长记 · 第12课 | 网络爬虫与Web自动化(下)

  • 2026-07-01 04:02:18
Python小白成长记 · 第12课 | 网络爬虫与Web自动化(下)
大家好,我是星源,一个正在自学Python的19岁编程小白 🤓。这是我的学习笔记系列,我会把每天学到的知识点整理出来,分享给同样在路上的小伙伴,希望能和大家一起进步 🚀。

📌 今日学习内容

👉 "今天学习网络爬虫的高级应用与实战项目"


✨ 知识点讲解

实战项目:构建站点地图

概念说明:通过爬取网站的所有链接,生成完整的站点地图,帮助SEO优化或内容审计。

代码示例

importrequestsbs4defbuild_sitemap(url):visited_urls=set()urls_to_visit= [url]whileurls_to_visit:current_url=urls_to_visit.pop(0)ifcurrent_urlinvisited_urls:continuetry:res=requests.get(current_url)res.raise_for_status()visited_urls.add(current_url)print(f'Crawling: {current_url}')soup=bs4.BeautifulSoup(res.text'html.parser')forlinkinsoup.find_all('a'):href=link.get('href')ifhref:abs_url=requests.compat.urljoin(current_urlhref)ifabs_url.startswith(urlandabs_urlnotinvisited_urls:urls_to_visit.append(abs_url)exceptExceptionase:print(f'Failed to crawl {current_url}{e}')# 将结果保存到文件withopen('sitemap.txt''w'asf:forurlinvisited_urls:f.write(url+'\n')# 使用示例build_sitemap('https://example.com')

小提示:在爬取网站时,尊重robots.txt文件规定的爬取范围,避免对服务器造成过大压力。

实战项目:价格监控爬虫

概念说明:编写爬虫监控电商网站商品价格,当价格低于设定阈值时发送通知。

代码示例

importrequestsbs4smtplibdefcheck_price(urltarget_pricenotify_email):try:res=requests.get(url)res.raise_for_status()soup=bs4.BeautifulSoup(res.text'html.parser')# 提取价格(需根据实际网页结构调整选择器)price_elem=soup.select_one('.price')ifprice_elem:price_text=price_elem.text.strip()price=float(price_text.replace('$'''))ifprice<=target_price:# 发送通知邮件msg=MIMEText(f'The price of the product is now ${price}!')msg['Subject'='Price Drop Alert'msg['From'='your_email@gmail.com'msg['To'=notify_emailwithsmtplib.SMTP('smtp.gmail.com'587assmtp_obj:smtp_obj.ehlo()smtp_obj.starttls()smtp_obj.login('your_email@gmail.com''your_password')smtp_obj.sendmail('your_email@gmail.com'notify_emailmsg.as_string())exceptExceptionase:print(f'Error checking price: {e}')# 使用示例check_price('https://example.com/product'100.0'notify@example.com')

小提示:电商网站通常对爬虫访问有限制,建议设置合理的请求间隔,避免被封禁。

实战项目:社交媒体数据采集

概念说明:采集社交媒体平台的公开数据(如微博、论坛帖子),进行舆情分析。

代码示例

fromseleniumimportwebdriverfrombs4importBeautifulSoupimporttimedefscrape_social_media(urlscroll_timesoutput_file):driver=webdriver.Chrome()driver.get(url)# 模拟滚动加载for_inrange(scroll_times):driver.execute_script('window.scrollTo(0, document.body.scrollHeight);')time.sleep(2)soup=BeautifulSoup(driver.page_source'html.parser')driver.quit()# 提取帖子信息(需根据实际网页结构调整选择器)posts=soup.find_all('div'class_='post-container')withopen(output_file'w'encoding='utf-8'asf:forpostinposts:text=post.find('div'class_='post-text')author=post.find('span'class_='author-name')iftextandauthor:f.write(f'Author: {author.text.strip()}\n')f.write(f'Content: {text.text.strip()}\n\n')# 使用示例scrape_social_media('https://example.com/social-media'5'social_media_posts.txt')

小提示:采集社交媒体数据时,务必遵守平台的使用条款和相关法律法规。

实战项目:构建自动化表单填写工具

概念说明:利用selenium实现自动填写在线表单,节省重复操作时间。

代码示例

fromseleniumimportwebdriverfromselenium.webdriver.common.keysimportKeysdriver=webdriver.Chrome()driver.get('https://example.com/form')try:# 定位并填写表单字段name_input=driver.find_element_by_name('name')email_input=driver.find_element_by_name('email')message_input=driver.find_element_by_name('message')name_input.send_keys('Your Name')email_input.send_keys('your_email@example.com')message_input.send_keys('This is an automated message.')# 提交表单submit_button=driver.find_element_by_class_name('submit-btn')submit_button.click()finally:driver.quit()

小提示:在实际应用中,可以结合配置文件或数据库存储表单数据,实现更灵活的自动化。

习题

  1. WebDriverWaittime.sleep的区别WebDriverWait会智能等待元素加载,提高效率;time.sleep则简单粗暴地固定等待,可能导致资源浪费。

  2. 如何处理反爬虫机制:通过设置合理的请求头、使用代理IP、模拟用户行为等方式降低被识别的风险。

  3. 编写一个监控特定商品价格的爬虫:需结合requestsBeautifulSoup提取价格信息,结合邮件模块发送通知。

  4. 自动化表单填写工具中,如何处理下拉选择框:使用seleniumSelect类操作下拉选择框。

  5. 在实际项目中,如何高效存储爬取的数据:可以使用数据库(如MySQL、MongoDB)或数据框架(如Pandas)进行结构化存储。


✅ 总结

  1. 站点地图构建:通过广度优先爬取网站所有链接,生成完整的站点地图。

  2. 价格监控爬虫:结合HTTP请求和邮件通知,实现价格监控功能。

  3. 社交媒体数据采集:利用动态加载处理和数据解析,采集公开社交数据。

  4. 自动化表单填写:通过selenium操作表单元素,实现自动填写和提交。

  5. 数据存储与管理:选择合适的存储方式,确保爬取数据的有效利用。


📢 互动提问

你在实际项目中,有没有尝试过将爬取的数据进行进一步分析(如可视化或生成报告)?是如何实现的?

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  1. CONNECT:[ UseTime:0.000977s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001568s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.022671s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003031s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001618s ]
  6. SELECT * FROM `set` [ RunTime:0.000789s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001356s ]
  8. SELECT * FROM `article` WHERE `id` = 493125 LIMIT 1 [ RunTime:0.001057s ]
  9. UPDATE `article` SET `lasttime` = 1783082787 WHERE `id` = 493125 [ RunTime:0.081364s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003947s ]
  11. SELECT * FROM `article` WHERE `id` < 493125 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.039545s ]
  12. SELECT * FROM `article` WHERE `id` > 493125 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005886s ]
  13. SELECT * FROM `article` WHERE `id` < 493125 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004728s ]
  14. SELECT * FROM `article` WHERE `id` < 493125 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.040101s ]
  15. SELECT * FROM `article` WHERE `id` < 493125 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.070237s ]
0.447778s