Python爬虫html网址实战笔记

仅供学习参考

一、获取文本和链接

import requests
from lxml import htmlbase_url = "https://abcdef自己的网址要改"
response = requests.get(base_url)
response.encoding = 'utf-8'  # 指定正确的编码方式tree = html.fromstring(response.content, parser=html.HTMLParser(encoding='utf-8'))# 固定部分XPath，只有最后一个div的索引会变化，自己修改，复制网址的xpath路径
fixed_xpath = "/html/body/div[4]/div[2]/ul/li[{div_index}]/a"filename = "现TXT文本内容.txt"with open(filename, "w", encoding="utf-8") as f:for div_index in range(1, 100):  # 假设有100个人# 构建完整的XPathxpath = fixed_xpath.format(div_index=div_index)# 使用XPath定位每个人员信息的元素person_elements = tree.xpath(xpath)for person_element in person_elements:# 获取网址路径和姓名信息url_path = person_element.get("href")full_url = base_url + url_path if url_path else ""name = person_element.xpath('string()').strip()  # 提取文本内容并去除空格# 仅输出网址中的路径部分url_path = full_url.replace(base_url, "")output_str = f"网址路径：{url_path}\n姓名：{name}\n\n"print(output_str)f.write(output_str)print(f"输出已保存到文件 {filename}")

结果：现TXT文本内容网址路径：http://abc.html
姓名：abc

二、根据现有的TXT文本，打开链接找到需要的内容。将内容放入姓名之后，以新的文本输出

import re
import requests
from lxml import html# 读取文件内容
with open("现TXT文本内容.txt", "rb") as file:content = file.read().decode('utf-8', 'ignore')lines = content.splitlines()email_xpath = '/html/body/div[4]/div/div/div/div/div[2]/div[1]/div[2]/div[4]/div[1]/text()'filename = "现TXT文本内容邮箱.txt"with open(filename, "w", encoding="utf-8") as f:# 遍历每一行内容for i in range(0, len(lines), 1):url_line = lines[i]  # 当前行为URLname_line = lines[i + 1]  # 下一行为姓名# 从URL和姓名行中提取URL和姓名信息url_match = re.search(r"https?://[^\s]+", url_line)name_match = re.search(r"姓名：(.+)", name_line)# 如果URL和姓名都匹配到了if url_match and name_match:url = url_match.group()name = name_match.group(1)# 发送GET请求到URL获取页面内容response = requests.get(url)# 将页面内容转为XPath对象tree = html.fromstring(response.content)# 使用XPath表达式提取邮箱信息email = tree.xpath(email_xpath)email = email[0] if email else "未找到邮箱地址"# 将姓名和邮箱信息写入文件output_str = f"{name}：{email}\n"print(output_str)f.write(output_str)# 输出保存结果
print(f"输出已保存到文件 {filename}")

输出TXT文本内容
abc：abc@aa.com
...