### Python 实现网页更新监控并发送提醒 为了实现网页内容更新时自动发送提醒功能，可以采用如下方法： 利用 `requests` 库获取目标网页的内容，并将其保存下来作为初始版本。之后定期重新请求该页面并与之前保存的内容对比，如果发现差异则认为发生了更改。 当检测到有新的变更发生后，则可以通过多种渠道发出警报通知给管理员或其他相关人员。这里可以选择使用邮件服务或者即时通讯工具API（比如企业微信/SMS网关等）来进行消息推送[^2]。 下面给出一段基于上述思路的具体代码示例: ```python import requests from hashlib import md5 import time import smtplib from email.mime.text import MIMEText def get_page_content(url): try: response = requests.get(url) if response.status_code == 200: return response.text else: raise Exception(f"Failed to fetch page with status code {response.status_code}") except Exception as e: print(e) def send_email(subject, content, sender, receivers, password): mail_host = "smtp.example.com" message = MIMEText(content, 'plain', 'utf-8') message['Subject'] = subject message['From'] = sender message['To'] = ",".join(receivers) try: smtpObj = smtplib.SMTP_SSL(mail_host, 465) smtpObj.login(sender, password) smtpObj.sendmail(sender, receivers, message.as_string()) print("Email sent successfully.") except smtplib.SMTPException as err: print(err) if __name__ == "__main__": url_to_watch = "http://example.com/" check_interval_seconds = 3600 * 24 old_md5 = None while True: new_html = get_page_content(url_to_watch) m = md5() m.update(new_html.encode('utf-8')) current_md5 = m.hexdigest() if not old_md5 or (old_md5 != current_md5): msg_body = f"The webpage at [{url_to_watch}] has been updated." send_email( "[Webpage Update Alert]", msg_body, "your-email@example.com", ["receiver1@example.com"], "YourPasswordHere!" ) old_md5 = current_md5 time.sleep(check_interval_seconds) ``` 此段程序会每隔一天检查一次指定URL所指向的HTML文档是否有任何变动；一旦监测到了不同之处就会触发一封电子邮件告知用户有关情况的发生。