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爬去内容： 图片地址，下载文档中的图片到指定文件夹中
实现原理：
1、保存网页源代码
2、Python 读文件加载源代码
3、正则表达式提取图片地址
4、下载图片
源文件
# _*_ conding:utf-8 _*_ <!DOCTYPE html> <html lang=‘en‘ xmlns=‘http://www.w3.org/1999/xhtml‘> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>??????IT?????????-?й?????IT???????????</title> <meta name="keywords" content="??????,IT??????,IT?????????,IT???????,IT??????,it?????,android,ios,flash,java,python,html5,swift,cocos2dx" /> <meta name="description" content="??????????й???IT???????????,??к???????IT???γ?,????30+??????????,??Android,iOS ,Flash,Java,Python,HTML5,Swift,Cocos2dx????????.????IT?????????,?????????IT????????,IT??????·???,????IT????????????,???IT??????????,????,?????????IT??????????" /> <link rel="stylesheet" href="https://s1.jikexueyuan.com/common/pkg/common_sync0_libs_4d81287.css" /><link rel="stylesheet" href="https://s1.jikexueyuan.com/common/pkg/common_sync1_libs_769abc5.css" /><link rel="stylesheet" href="https://s1.jikexueyuan.com/common/widget/header/header_d41d8cd.css" /><link rel="stylesheet" href="https://s1.jikexueyuan.com/index/pkg/index_sync0_libs_63f8fb8.css" /></head> <body> <div id="wrapper"> <script type="text/javascript" src="//e.jikexueyuan.com/static/js/growingio.js?t=1508999945000"></script> <script type="text/javascript" src="//e.jikexueyuan.com/headerandfooter/js/mask.js?t=1508999945000"></script> <script type="text/javascript" src="//e.jikexueyuan.com/static/js/jquery.min.js?t=1508999945000"></script> <script type="text/javascript" src="//e.jikexueyuan.com/headerandfooter/js/header.min.js?t=1508999945000"></script> <script type="text/javascript" src="//e.jikexueyuan.com/headerandfooter/js/web_socket.js?t=1508999945000"></script> <script type="text/javascript" src="//e.jikexueyuan.com/headerandfooter/js/websocket.js?t=1508999945000"></script> <div id="header_top_notice"></div> <div id="jk-header"> <div class="header"> <h1> <a href="//www.jikexueyuan.com" class="logo"> <img src="//e.jikexueyuan.com/headerandfooter/images/logo.png?t=1508999945000" width="100" alt="??????" /> </a> </h1> <nav style="width:490px;"> <ul> <li> <a href="//www.jikexueyuan.com" class="home">???</a> </li> <li class="careerpath"> <a href="//www.jikexueyuan.com/zhiye/">??</a><i class="slide-icon"></i> <div class="zhiye-submenu slide-submeu"> <strong>???</strong> <a href="//www.jikexueyuan.com/zhiye/web"><i class="web-icon"></i>Web???????</a> <a href="//www.jikexueyuan.com/zhiye/wechatapp"><i class="wx-icon"></i>???С????</a> <strong>?????</strong> <a href="//www.jikexueyuan.com/zhiye/android"><i class="android-icon"></i>Android?????</a> <a href="//www.jikexueyuan.com/zhiye/ios"><i class="ios-icon"></i>iOS?????</a> <strong>???</strong> <a href="//www.jikexueyuan.com/zhiye/python"><i class="python-icon"></i>Python?????</a> <a href="//www.jikexueyuan.com/zhiye/php"><i class="php-icon"></i>PHP?????</a> <a href="//www.jikexueyuan.com/zhiye/go"><i class="golang-icon"></i>Golang?????</a> <strong>??????</strong> <a href="//www.jikexueyuan.com/zhiye/bigdata"><i class="data-icon"></i>?????????з??????</a> <strong>???????</strong> <a href="//www.jikexueyuan.com/zhiye/ml"><i class="mlearning-icon"></i>???????????</a> <!--<a href="#"><i class="yw-icon"></i>????????</a> <a href="#"><i class="xmjl-icon"></i>???????</a>--> </div> </li> <li> <a href="//www.jikexueyuan.com/course/">?γ?</a><i class="slide-icon"></i> <div class="slide-submeu"> <a href="//www.jikexueyuan.com/course/">?γ??</a> <a href="//ke.jikexueyuan.com/zhiye/">??·??</a> <a href="//www.jikexueyuan.com/path/">??????</a> <a href="//ke.jikexueyuan.com/xilie/">??пγ?</a> </div> </li> <li> <a href="//www.jikexueyuan.com/partner">???</a><i class="slide-icon"></i> <div class="slide-submeu qy-box"> <a href="//zt.jikexueyuan.com/microsoftai"><i class="wr-icon"></i>?????????? 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Vue ?????????? webpack ????</a></p></li> </ul> <form class="subscription-sub"> <div class="form-container"> <input id="subscript_email" type="text" name="email" placeholder="????????????????"> <a href="javascript:;" class="subscription-btn" id="subscript_sub">????</a> <div class="error-content"> <p class="content">???????????????????</p> </div> </div> </form> </div> <div class="aside-allCategory"> <div class="bd"> <ul class="aside-cList"> <li> <div> <a cgid="2" href="//www.jikexueyuan.com/course/web/">??????</a> <div class="list-show"> <div class="knowledge-system"> <p class="list-title knowledge-title"><span>?????</span></p> <div> <dl> <dt><a href="//www.jikexueyuan.com/course/webbase/" cgid="16">??????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/html/" cgid="76">HTML</a> <a href="//www.jikexueyuan.com/course/css/" cgid="77">CSS</a> <a href="//www.jikexueyuan.com/course/javascript/" cgid="78">JavaScript</a> <a href="//www.jikexueyuan.com/course/html5/" cgid="79">HTML5</a> <a href="//www.jikexueyuan.com/course/css3/" cgid="80">CSS3</a> <a href="//www.jikexueyuan.com/course/prospective/" cgid="81">??????</a> </dd> </dl> <dl> <dt><a href="//www.jikexueyuan.com/course/advance/" cgid="18">??????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/typescript/" cgid="97">Typescript</a> <a href="//www.jikexueyuan.com/course/security/" cgid="98">?????</a> <a href="//www.jikexueyuan.com/course/practice/" cgid="99">?????</a> </dd> </dl> <dl> <dt><a href="//www.jikexueyuan.com/course/webframe/" cgid="17">?????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/jquery/" cgid="82">jQuery</a> <a href="//www.jikexueyuan.com/course/jqueryui/" cgid="83">jQuery UI</a> <a href="//www.jikexueyuan.com/course/jquerymobile/" cgid="84">jQuery Mobile</a> <a href="//www.jikexueyuan.com/course/extjs/" cgid="85">Ext JS</a> <a href="//www.jikexueyuan.com/course/angularjs/" cgid="86">AngularJS</a> <a 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target="_blank">Vue.js????????????&????&??</p></a></li> <li><img src="http://jiuye-res.jikexueyuan.com/others/20170704/2c22eefe-9ad2-498e-8ae3-cee39a569fe7.png" alt="Python???????????????????????? - ?????? -0704"><p><a href="http://ad.jikexueyuan.com/v1/code_slot/19/creative/19/redirect?delivery_ad_id=12&_t=1509850511" target="_blank">Python????????????????????????</p></a></li> </ul> </div> </div> </div> </li> <li> <div> <a cgid="1" href="//www.jikexueyuan.com/course/mobile/">???????</a> <div class="list-show"> <div class="knowledge-system"> <p class="list-title knowledge-title"><span>?????</span></p> <div> <dl> <dt><a href="//www.jikexueyuan.com/course/app/" cgid="58">??????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/android/" cgid="59">Android</a> <a href="//www.jikexueyuan.com/course/ios/" cgid="60">iOS</a> </dd> </dl> <dl> <dt><a href="//www.jikexueyuan.com/course/games/" cgid="13">???????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/cocos/" cgid="63">Cocos</a> <a href="//www.jikexueyuan.com/course/unity3d/" cgid="64">Unity3D</a> <a href="//www.jikexueyuan.com/course/spritekit2d/" cgid="65">SpriteKit 2D</a> <a href="//www.jikexueyuan.com/course/unreal/" cgid="66">Unreal</a> </dd> </dl> <dl> <dt><a href="//www.jikexueyuan.com/course/frame/" cgid="14">??????</a></dt> <dd class="cf"> <a href="//www.jikexueyuan.com/course/cordova/" cgid="68">Cordova</a> <a href="//www.jikexueyuan.com/course/reactnative1/" cgid="382">React Native</a> </dd> </dl> </div> </div> <div class="recommend-study" > <p class="list-title recommend-title"><span>?????</span></p> <ul class="recommend"> <li><img src="http://jiuye-res.jikexueyuan.com/others/20171027/4ff72412-2aa4-4071-ab9d-829a1fdbde8f.png" alt="?????-Python????????"><p><a href="http://ad.jikexueyuan.com/v1/code_slot/17/creative/96/redirect?delivery_ad_id=80&_t=1509850511" target="_blank">Python????????????????????120???????</p></a></li> <li><img src="http://jiuye-res.jikexueyuan.com/others/20170705/417c2b75-8df5-4f87-8708-c9e7f91a840b.png" alt="Vue.js????????????&????&?? - ?????? - 0704"><p><a href="http://ad.jikexueyuan.com/v1/code_slot/18/creative/18/redirect?delivery_ad_id=11&_t=1509850511" target="_blank">Vue.js????????????&????&??</p></a></li> <li><img src="http://jiuye-res.jikexueyuan.com/others/20170704/2c22eefe-9ad2-498e-8ae3-cee39a569fe7.png" alt="Python???????????????????????? - ?????? -0704"><p><a href="http://ad.jikexueyuan.com/v1/code_slot/19/creative/19/redirect?delivery_ad_id=12&_t=1509850511" target="_blank">Python????????????????????????</p></a></li> </ul> </div> </div> </div> </li> <li> <div> <a cgid="3" href="//www.jikexueyuan.com/course/dev/">??????</a> <div class="list-show"> <div class="knowledge-system"> <p class="list-title knowledge-title"><span>?????</span></p> <div> <dl> <dt><a href="//www.jikexueyuan.com/course/python/" cgid="23">Python</a></dt> <dd class="cf"> <a 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源代码
import re,requests #读取文件 with open(‘ts.txt‘,‘r‘,encoding=‘utf-8‘) as f: html=f.read() f.close() # 匹配图片地址 pic_url=re.findall(r‘<img class="uptodate-img" src="(.*?)"‘,html,re.S) i=0 for each in pic_url: print(‘现在开始下载第%s张‘%i) pic=requests.get(each) fp=open(‘picture\\‘+str(i)+‘.png‘,‘wb‘) fp.write(pic.content) fp.close() i+=1
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原文地址：http://www.cnblogs.com/Mjonj/p/7786837.html
