Python爬虫学习记录(1)——百度贴吧图片下载
2015-08-22 20:06
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#!/usr/bin/python #coding=utf-8 import os from urllib.request import urlopen from urllib.request import urlretrieve import re def getHtml(url):#获取网页的函数 page = urlopen(url) html = page.read() return html def getImg(html,id,page_num): #获取图片的函数 reg = r'http:\/\/imgsrc.baidu.com\/forum\/.{70,100}jpg' imgre = re.compile(reg) html = str(html) f = open("/usr/lxp/python_test/getImg_Python/out_" + str(page_num),"w+") f.write(html) f.close() imglist = imgre.findall(html) x = 0 for imgurl in imglist: save_name = 'topic_'+ id + '_' + str(page_num) + '_%s.jpg' % x print('download' + save_name +' sucessfully from ' + imgurl) urlretrieve(imgurl,save_name) x+=1 return imglist def getAllImg(topic_id):#解析网页按页数下载 page_num = 1 html_len=0 os.system('mkdir topic_' + topic_id) while True : html = getHtml("http://tieba.baidu.com/p/" + topic_id + '?see_lz=1&pn=' + str(page_num)) print(str(html_len) + ' ' + str(len(html))) if html_len == len(html): break getImg(html,topic_id,page_num) os.system('mv topic_' + topic_id + '*.jpg topic_' + topic_id) html_len = len(html) page_num = page_num + 1 return page_num topic_id = input("topic id:") getAllImg(topic_id)
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