本文实例讲述了Python实现的爬取百度贴吧图片功能。分享给大家供大家参考，具体如下：
#coding:utf-8
import requests
import urllib2
import urllib
```
from lxml import etree
class Tieba:
def __init__(self):
self.tiebaName = raw_input("请输入需要爬取的贴吧:")
self.beginPage = int(raw_input("请输入爬取的起始页："))
self.endPage = int(raw_input("请输入爬取的结束页："))
self.baseURL = "http://tieba.baidu.com"
#self.headers = {"User-Agent" : "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.86 Safari/537.36"}
self.headers = {"User-Agent" : "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1 Trident/5.0;"} def startWork(self):
"""
发送贴吧每一页的url请求
"""
for page in range(self.beginPage, self.endPage + 1):
pn = (page - 1) * 50
keyword = {"kw" : self.tiebaName, "pn" : pn}
kw = urllib.urlencode(keyword)
url = self.baseURL + "/f?" + kw
#print url
html = self.loadRequest(url)
self.loadPage(html)
def loadRequest(self, url):
"""
发送请求，返回响应
url: 发送请求的url地址
"""
request = urllib2.Request(url, headers = self.headers)
#request = urllib2.Request(url)
response = urllib2.urlopen(request)
return response.read()
def loadPage(self, html):
"""
提取每个帖子的url，并发送请求，获取响应
html: 贴吧每一页的html
"""
content = etree.HTML(html)
print '------'
print content
# xpath 返回的所有匹配成功后的结果的列表
#pagelink_list = content.xpath("//div[@class='threadlist_lz clearfix']/div/a[@class='j_th_tit']/@href")
pagelink_list = content.xpath("//div[@class='col2_right j_threadlist_li_right']//div/a/@href")
pagelink_list = content.xpath("//div[@class='t_con cleafix']//div/a/@href")
for link in pagelink_list:
print link
self.loadImage(self.loadRequest(self.baseURL + link))
def loadImage(self, html):
"""
提取帖子里用户发送的图片的url地址
html: 每个帖子的html
"""
content = etree.HTML(html)
imagelink_list = content.xpath("//div[@class='p_content ']//img[@class='BDE_Image']/@src")
for link in imagelink_list:
self.writeImage(self.loadRequest(link), link[-10:])
def writeImage(self, data, filename):
"""
将图片的响应数据，写入到本地磁盘里
data: 图片的响应数据
filename: 文件名(图片url的后10位)
"""
print "正在保存图片...%s" % filename
with open(filename, "wb") as f:
f.write(data)
if __name__ == "__main__":
tieba = Tieba()
tieba.startWork()
更多关于Python相关内容可查看本站专题：《Python Socket编程技巧总结》、《Python正则表达式用法总结》、《Python数据结构与算法教程》、《Python函数使用技巧总结》、《Python字符串操作技巧汇总》、《Python入门与进阶经典教程》及《Python文件与目录操作技巧汇总》
希望本文所述对大家Python程序设计有所帮助。
