Python 文档解析lxml库的使用详解_python_

pip install lxml

from lxml import etree

from lxml import etree parse_html = etree.HTML(html)

from lxml import etree html_str = ''' 
Python
Java
CSDN
 ''' html = etree.HTML(html_str) # tostring()将标签元素转换为字符串输出，注意：result为字节类型 result = etree.tostring(html) print(result.decode('utf-8'))

Python
Java
CSDN

from lxml import etree html_str = ''' 
Python
Java
CSDN
 ''' html=etree.HTML(html_str) xpath_bds='//@href' r_list = html.xpath(xpath_bds) print(r_list) 

import os import sys import requests from lxml import etree x = requests.get('https://www.csdn.net/') html = etree.HTML(x.text) xpath_bds = '//img/@src' img_list = html.xpath(xpath_bds) # 创建img文件夹 os.chdir(os.path.dirname(sys.argv[0])) if not os.path.exists('img'): os.mkdir('img') print('创建文件夹成功') else: print('文件夹已存在') # 下载图片 for i in range(len(img_list)): img = requests.get(img_list[i]).content if img_list[i].endswith('.jpg'): with open(f'./img/{i}.jpg', 'wb') as f: f.write(img) elif img_list[i].endswith('.jpeg'): with open(f'./img/{i}.jpeg', 'wb') as f: f.write(img) elif img_list[i].endswith('.png'): with open(f'./img/{i}.png', 'wb') as f: f.write(img) else: print(f'第{i + 1}张图片格式不正确') continue print(f'第{i + 1}张图片下载成功')