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Python小白成长记 · 第12课 | 网络爬虫与Web自动化(中)

  • 2026-07-02 11:55:57
Python小白成长记 · 第12课 | 网络爬虫与Web自动化(中)
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

👉 "今天我们深入网络爬虫与Web自动化,学习进阶技巧"


✨ 知识点讲解

处理JavaScript渲染页面

概念说明:许多现代网页依赖JavaScript动态加载内容,requestsBeautifulSoup无法直接处理这类页面。需要借助selenium模块启动浏览器,等待JavaScript执行完成后再获取页面内容。

代码示例

fromseleniumimportwebdriverfromselenium.webdriver.common.byimportByfromselenium.webdriver.support.uiimportWebDriverWaitfromselenium.webdriver.supportimportexpected_conditionsasECdriver=webdriver.Chrome()driver.get('https://example.com')try:# 等待指定元素加载完成element=WebDriverWait(driver10).until(EC.presence_of_element_located((By.ID"target_element"))    )print('Page title:'driver.title)print('Element text:'element.text)finally:driver.quit()

小提示:使用WebDriverWait配合expected_conditions可以有效处理页面加载延迟问题。

处理登录与表单提交

概念说明:许多网站需要登录才能访问内容,可以通过selenium模拟用户输入并提交表单。

代码示例

fromseleniumimportwebdriverdriver=webdriver.Chrome()driver.get('https://accounts.google.com/signin')# 定位邮箱输入框并输入内容email_input=driver.find_element_by_id('identifierId')email_input.send_keys('your_email@gmail.com')email_input.submit()# 等待并处理下一步try:password_input=WebDriverWait(driver10).until(EC.presence_of_element_located((By.NAME'password'))    )password_input.send_keys('your_password')password_input.submit()finally:driver.quit()

小提示:处理登录流程时,注意不要在代码中硬编码敏感信息(如密码),可以使用环境变量或配置文件存储。

爬取动态数据:以Twitter为例

概念说明:爬取动态加载内容(如无限滚动的社交媒体页面),需要结合selenium模拟用户滚动行为并持续加载内容。

代码示例

fromseleniumimportwebdriverfrombs4importBeautifulSoupdriver=webdriver.Chrome()driver.get('https://twitter.com/search?q=python')# 模拟用户滚动操作for_inrange(3):  # 滚动3次driver.execute_script('window.scrollTo(0, document.body.scrollHeight);')time.sleep(2)  # 等待新内容加载# 获取页面内容并解析soup=BeautifulSoup(driver.page_source'html.parser')tweets=soup.find_all('div'class_='tweet')fortweetintweets:text=tweet.find('div'class_='tweet-text')iftext:print(text.text.strip())driver.quit()

小提示:动态爬取过程中,注意不要过于频繁地发送请求,以免对目标网站服务器造成压力。

实战项目:批量下载文件

概念说明:编写一个程序,从指定网页下载所有链接指向的文件(如PDF、图片等)。

代码示例

importosrequestsbs4defdownload_files(urlfile_typedownload_folder):# 获取页面内容res=requests.get(url)res.raise_for_status()soup=bs4.BeautifulSoup(res.text'html.parser')# 创建下载文件夹os.makedirs(download_folderexist_ok=True)# 查找所有指定类型的文件链接link_elems=soup.select(f'a[href$="{file_type}"]')forlinkinlink_elems:file_url=link.get('href')ifnotfile_url.startswith('http'):file_url=requests.compat.urljoin(urlfile_url)  # 处理相对路径# 下载文件print(f'Downloading {file_url}...')file_res=requests.get(file_url)file_res.raise_for_status()# 保存文件file_name=os.path.basename(file_url)withopen(os.path.join(download_folderfile_name), 'wb'asf:forchunkinfile_res.iter_content(100000):f.write(chunk)# 使用示例download_files('https://example.com/resources''.pdf''downloaded_pdfs')

小提示:使用requests.compat.urljoin()处理相对链接与绝对链接的转换。

实战项目:监控网页更新

概念说明:编写一个程序,定期检查指定网页是否有更新,并在检测到更新时发送通知。

代码示例

importrequeststimesmtplibfromemail.mime.textimportMIMETextdefcheck_website_update(urlcheck_intervalnotify_email):last_content=NonewhileTrue:# 获取网页内容res=requests.get(url)res.raise_for_status()current_content=res.text# 检查内容是否变化iflast_content!=current_content:last_content=current_content# 发送通知邮件msg=MIMEText(f'The website {url} has been updated!')msg['Subject'='Website Update Notification'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())time.sleep(check_interval)# 使用示例check_website_update('https://example.com'3600'notify@example.com')

小提示:在实际应用中,可以结合任务调度工具(如Linux的cron或Windows的任务计划程序)定期运行监控脚本。


✅ 总结

  1. 动态页面处理:使用selenium结合显式等待,解决JavaScript渲染页面的爬取问题。

  2. 登录与表单提交:通过selenium模拟用户输入,完成登录流程。

  3. 动态数据爬取:模拟用户滚动行为,爬取无限滚动加载的网页内容。

  4. 批量文件下载:定位指定类型的文件链接并下载保存。

  5. 网页更新监控:定期检查网页内容变化,通过邮件发送更新通知。


📢 互动提问

你在爬取动态加载网页或处理登录流程时,遇到过哪些挑战?是如何解决的?

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  1. CONNECT:[ UseTime:0.000557s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000604s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.014686s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000349s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000621s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000590s ]
  8. SELECT * FROM `article` WHERE `id` = 492858 LIMIT 1 [ RunTime:0.014282s ]
  9. UPDATE `article` SET `lasttime` = 1783082751 WHERE `id` = 492858 [ RunTime:0.010399s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000373s ]
  11. SELECT * FROM `article` WHERE `id` < 492858 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009744s ]
  12. SELECT * FROM `article` WHERE `id` > 492858 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000505s ]
  13. SELECT * FROM `article` WHERE `id` < 492858 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004176s ]
  14. SELECT * FROM `article` WHERE `id` < 492858 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012737s ]
  15. SELECT * FROM `article` WHERE `id` < 492858 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004822s ]
0.162017s