1.分分钟扒一个网页下来
怎样扒网页呢？其实就是根据URL来获取它的网页信息，虽然我们在浏览器中看到的是一幅幅优美的画面，但是其实是由浏览器解释才呈现出来的，实质它是一段HTML代码，加 JS、CSS，如果把网页比作一个人，那么HTML便是他的骨架，JS便是他的肌肉，CSS便是它的衣服。所以最重要的部分是存在于HTML中的，下面我们就写个例子来扒一个网页下来。
1 import urllib2
2
3 request = urllib2.Request("http://www.baidu.com")
4 reponse = urllib2.urlopen(request)
5
6 print reponse.read()
1 var _chrome_37_fix = document.createElement("style");
2 _chrome_37_fix.type="text/css";
3 _chrome_37_fix.setAttribute("data-for","result");
4 _chrome_37_fix.innerHTML = ".t,.f16,#kw,.s_ipt,.c-title,.c-title-size,.to_zhidao,.to_tieba,.to_zhidao_bottom{font-size:15px;} .ec-hospital-info-main h2,.ad-widget-gx_sck-ylzx-doctor-info h2,.ec-card-main h2,.ad-widget-h1 h2,.ad-widget-title h2,.ad-widget-small-head h2,.ad-widget-small-head h2 a,.ad-widget-header .ec-figcaption h2{font-size: 15px !important;}";
5 document.getElementsByTagName("head")[0].appendChild(_chrome_37_fix);
6 }
7 </script>
8 <div id="wrapper" style="display:none;">
9
10
11
12
13
14
15 <script>if(window.bds&&bds.util&&bds.util.setContainerWidth){bds.util.setContainerWidth();}</script><div id="head"><div class="head_wrapper"><div class="s_form"><div class="s_form_wrapper"><div id="lg"><img hidefocus="true" src="//www.baidu.com/img/bd_logo1.png" width="270" height="129"></div><a href="/" id="result_logo" onmousedown="return c({'fm':'tab','tab':'logo'})"><img src="//www.baidu.com/img/baidu_jgylogo3.gif" alt="到百度首页" title="到百度首页"></a><form id="form" name="f" action="/s" class="fm"><input type="hidden" name="ie" value="utf-8"><input type="hidden" name="f" value="8"><input type="hidden" name="rsv_bp" value="1"><input type="hidden" name="rsv_idx" value="1"><input type=hidden name=ch value=""><input type=hidden name=tn value="baidu"><input type=hidden name=bar value=""><span class="bg s_ipt_wr"><input id="kw" name="wd" class="s_ipt" value="" maxlength="255" autocomplete="off"></span><span class="bg s_btn_wr"><input type="submit" id="su" value="百度一下" class="bg s_btn"></span><span class="tools"><span id="mHolder"><div id="mCon"><span>输入法</span></div><ul id="mMenu"><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></span></span><input type="hidden" name="rn" value=""><input type="hidden" name="oq" value=""><input type="hidden" name="rsv_pq" value="a9751a040000edc2"><input type="hidden" name="rsv_t" value="1a36JwX6EYzEBPQCuW35Vnxbm3RooFs3vSI29QpW+rmQhyzyjvBQ3WAH27Y"><input type="hidden" name="rqlang" value="cn"></form><div id="m"></div></div></div><div id="u"><a class="toindex" href="/">百度首页</a><a href="javascript:;" name="tj_settingicon" class="pf">设置<i class="c-icon c-icon-triangle-down"></i></a><a href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" class="lb" onclick="return false;">登录</a></div><div id="u1"><a href="http://www.nuomi.com/?cid=002540" name="tj_trnuomi" class="mnav">糯米</a><a href="http://news.baidu.com" name="tj_trnews" class="mnav">新闻</a><a href="http://www.hao123.com" name="tj_trhao123" class="mnav">hao123</a><a href="http://map.baidu.com" name="tj_trmap" class="mnav">地图</a><a href="http://v.baidu.com" name="tj_trvideo" class="mnav">视频</a><a href="http://tieba.baidu.com" name="tj_trtieba" class="mnav">贴吧</a><a href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" class="lb" onclick="return false;">登录</a><a href="http://www.baidu.com/gaoji/preferences.html" name="tj_settingicon" class="pf">设置</a><a href="http://www.baidu.com/more/" name="tj_briicon" class="bri" style="display: block;">更多产品</a></div></div></div>
16
17
18
19 <div class="s_tab" id="s_tab">
20 <b>网页</b><a href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'news'})">新闻</a><a href="http://tieba.baidu.com/f?kw=&fr=wwwt" wdfield="kw" onmousedown="return c({'fm':'tab','tab':'tieba'})">贴吧</a><a href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=&fr=wwwt" wdfield="word" onmousedown="return c({'fm':'tab','tab':'zhidao'})">知道</a><a href="http://music.baidu.com/search?fr=ps&ie=utf-8&key=" wdfield="key" onmousedown="return c({'fm':'tab','tab':'music'})">音乐</a><a href="http://image.baidu.com/search/index?tn=baiduimage&ps=1&ct=201326592&lm=-1&cl=2&nc=1&ie=utf-8&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'pic'})">图片</a><a href="http://v.baidu.com/v?ct=301989888&rn=20&pn=0&db=0&s=25&ie=utf-8&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'video'})">视频</a><a href="http://map.baidu.com/m?word=&fr=ps01000" wdfield="word" onmousedown="return c({'fm':'tab','tab':'map'})">地图</a><a href="http://wenku.baidu.com/search?word=&lm=0&od=0&ie=utf-8" wdfield="word" onmousedown="return c({'fm':'tab','tab':'wenku'})">文库</a><a href="//www.baidu.com/more/" onmousedown="return c({'fm':'tab','tab':'more'})">更多»</a>
21 </div>
22
23
24
25 <div class="qrcodeCon">
26 <div id="qrcode">
27 <div class="qrcode-item qrcode-item-1">
28 <div class="qrcode-img"></div>
29 <div class="qrcode-text">
30 <p><b>手机百度</b></p>
31 </div>
32 </div>
33 </div>
34 </div>
35 <div id="ftCon">
36
37 <div class="ftCon-Wrapper"><div id="ftConw"><p id="lh"><a id="setf" href="//www.baidu.com/cache/sethelp/help.html" onmousedown="return ns_c({'fm':'behs','tab':'favorites','pos':0})" target="_blank">把百度设为主页</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about'})" href="http://home.baidu.com">关于百度</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about_en'})" href="http://ir.baidu.com">About Baidu</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_tuiguang'})" href="http://e.baidu.com/?refer=888">百度推广</a></p><p id="cp">©2017 Baidu <a href="http://www.baidu.com/duty/" onmousedown="return ns_c({'fm':'behs','tab':'tj_duty'})">使用百度前必读</a> <a href="http://jianyi.baidu.com/" class="cp-feedback" onmousedown="return ns_c({'fm':'behs','tab':'tj_homefb'})">意见反馈</a> 京ICP证030173号 <i class="c-icon-icrlogo"></i> <a id="jgwab" target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=11000002000001">京公网安备11000002000001号</a> <i class="c-icon-jgwablogo"></i></p></div></div></div>
38 <div id="wrapper_wrapper">
39 </div>
40 </div>
41 <div class="c-tips-container" id="c-tips-container"></div>
42
43 <script>
44 window.__async_strategy=2;
45 //window.__switch_add_mask=false;
46 </script>
47
48
49 <script>
50 var bds={
51 se:{},
52 su:{
53 urdata:[],
54 urSendClick:function(){}
55 },
56 util:{},
57 use:{},
58 comm : {
59 domain:"http://www.baidu.com",
60 ubsurl : "http://sclick.baidu.com/w.gif",
61 tn:"baidu",
62 queryEnc:"",
63 queryId:"",
64 inter:"",
65 templateName:"",
66 sugHost : "http://suggestion.baidu.com/su",
67 query : "",
68 qid : "a9751a040000edc2",
69 cid : "0",
70 sid : "1459_21112_17001_20929",
71 indexSid : "1459_21112_17001_20929",
72 stoken : "",
73 serverTime : "1490939676",
74 user : "",
75 username : "",
76 userid : "0",
77 loginAction : [],
78 useFavo : "",
79 pinyin : "",
80 favoOn : "",
81 cookie : {"BAIDUID":"30EC6C2D9EBB46E5FB786326350BD39E:FG=1","BIDUPSID":"E95F42E62F7AC75675AA34F1D402E7AC","PSTM":"1474271387","H_PS_PSSID":"1459_21112_17001_20929","_umeng":"1","BDSVRTM":"0","BD_HOME":"0"},
82 userAgent : "Mozilla/5.0 (Windows; U; zh-CN) AppleWebKit/533.19.4 (KHTML, like Gecko) AdobeAIR/24.0",
83 curResultNum:"0",
84 rightResultExist:false,
85 protectNum:0,
86 zxlNum:0,
87 pageNum:1,
88 pageSize:10,
89 newindex:0,
90 async:2,
91 maxPreloadThread:5,
92 maxPreloadTimes:10,
93 preloadMouseMoveDistance:5,
94 switchAddMask:false,
95 isDebug:false,
96 ishome : 1,
97 flagTranslateResult:0,
98 globalLogFlag:0
99 ,encTn:'1a36JwX6EYzEBPQCuW35Vnxbm3RooFs3vSI29QpW+rmQhyzyjvBQ3WAH27Y' }
100 };
101
102
103
104
105
106
107 //防止从结果页打开的页面中通过opener.xxx来影响百度页面
108
109
110 var name,navigate,al_arr=[];
111 var selfOpen = window.open;eval("var open = selfOpen;");
112 var isIE=navigator.userAgent.indexOf("MSIE")!=-1&&!window.opera;
113 var E = bds.ecom= {};
114
115 bds.se.mon = {'loadedItems':[],'load':function(){},'srvt':-1};
116
117 try {
118 bds.se.mon.srvt = parseInt(document.cookie.match(new RegExp("(^| )BDSVRTM=([^;]*)(;|$)"))[2]);
119 document.cookie="BDSVRTM=;expires=Sat, 01 Jan 2000 00:00:00 GMT";
120 }catch(e){}
121
122 //兼容之前一些变量
123 var
124 bdUser = bds.comm.user?bds.comm.user:null,
125 bdQuery = bds.comm.query,
126 bdUseFavo = bds.comm.useFavo,
127 bdFavoOn = bds.comm.favoOn,
128 bdCid = bds.comm.cid,
129 bdSid = bds.comm.sid,
130 bdServerTime = bds.comm.serverTime,
131 bdQid = bds.comm.queryId,
132 bdstoken = bds.comm.stoken,
133 login_success = [];
134
135
136
137 </script>
138 <script>
139 /* https域名转换工具 */
140 bds.util.domain = (function(){
141 var list = {
142 "graph.baidu.com": "http://graph.baidu.com",
143 "p.qiao.baidu.com":"http://p.qiao.baidu.com",
144 "vse.baidu.com":"http://vse.baidu.com",
145 "hdpreload.baidu.com":"http://hdpreload.baidu.com",
146 "lcr.open.baidu.com":"http://lcr.open.baidu.com",
147 "kankan.baidu.com":"http://kankan.baidu.com",
148 "xapp.baidu.com":"http://xapp.baidu.com",
149 "dr.dh.baidu.com":"http://dr.dh.baidu.com",
150 "xiaodu.baidu.com":"http://xiaodu.baidu.com",
151 "sensearch.baidu.com":"http://sensearch.baidu.com",
152 "s1.bdstatic.com":"http://s1.bdstatic.com",
153 "olime.baidu.com":"http://olime.baidu.com",
154 "app.baidu.com":"http://app.baidu.com",
155 "i.baidu.com":"http://i.baidu.com",
156 "c.baidu.com":"http://c.baidu.com",
157 "sclick.baidu.com":"http://sclick.baidu.com",
158 "nsclick.baidu.com":"http://nsclick.baidu.com",
159 "sestat.baidu.com":"http://sestat.baidu.com",
160 "eclick.baidu.com":"http://eclick.baidu.com",
161 "api.map.baidu.com":"http://api.map.baidu.com",
162 "ecma.bdimg.com":"http://ecma.bdimg.com",
163 "ecmb.bdimg.com":"http://ecmb.bdimg.com",
164 "t1.baidu.com":"http://t1.baidu.com",
165 "t2.baidu.com":"http://t2.baidu.com",
166 "t3.baidu.com":"http://t3.baidu.com",
167 "t10.baidu.com":"http://t10.baidu.com",
168 "t11.baidu.com":"http://t11.baidu.com",
169 "t12.baidu.com":"http://t12.baidu.com",
170 "i7.baidu.com":"http://i7.baidu.com",
171 "i8.baidu.com":"http://i8.baidu.com",
172 "i9.baidu.com":"http://i9.baidu.com",
173 "b1.bdstatic.com":"http://b1.bdstatic.com",
174 "ss.bdimg.com":"http://ss.bdimg.com",
175 "opendata.baidu.com":"http://opendata.baidu.com",
176 "api.open.baidu.com":"http://api.open.baidu.com",
177 "tag.baidu.com":"http://tag.baidu.com",
178 "f3.baidu.com":"http://f3.baidu.com",
179 "s.share.baidu.com":"http://s.share.baidu.com",
180 "bdimg.share.baidu.com":"http://bdimg.share.baidu.com",
181 "1.su.bdimg.com":"http://1.su.bdimg.com",
182 "2.su.bdimg.com":"http://2.su.bdimg.com",
183 "3.su.bdimg.com":"http://3.su.bdimg.com",
184 "4.su.bdimg.com":"http://4.su.bdimg.com",
185 "5.su.bdimg.com":"http://5.su.bdimg.com",
186 "6.su.bdimg.com":"http://6.su.bdimg.com",
187 "7.su.bdimg.com":"http://7.su.bdimg.com",
188 "8.su.bdimg.com":"http://8.su.bdimg.com"
189 };
190
191
192 var get = function(url) {
193 if(location.protocol === "http") {
194 return url;
195 }
196 var reg = /^(http[s]?:\/\/)?([^\/]+)(.*)/,
197 matches = url.match(reg);
198 /* 判断传入参数是域名还是地址，分别做处理 */
199 url = list.hasOwnProperty(matches[2])&&(list[matches[2]] + matches[3]) || url;
200 return url;
201 },
202 set = function(kdomain,vdomain) {
203 list[kdomain] = vdomain;
204 };
205 return {
206 get : get,
207 set : set
208 }
209 })();
210 </script>
211 <script>
212 //让用户更快看到首页
213 if(!location.hash.match(/[^a-zA-Z0-9]wd=/)){
214 document.getElementById("wrapper").style.display='block';
215 setTimeout(function(){
216 try{
217 var kw=document.getElementById("kw");
218 kw.focus();
219 kw.parentNode.className="bg s_ipt_wr iptfocus quickdelete-wrap";
220 }catch(e){}
221 },0);
222 }
223
224 </script>
225 <script type="text/javascript" src="http://s1.bdstatic.com/r/www/cache/static/jquery/jquery-1.10.2.min_65682a2.js"></script>
226
227
228
229
230 <script>
231 (function(){
232
233 var result_common_css="<style data-for=\"result\" id=\"css_result\" type=\"text\/css\">body{color:#333;background:#fff;padding:6px 0 0;margin:0;position:relative;min-width:900px}body,th,td,.p1,.p2{font-family:arial}p,form,ol,ul,li,dl,dt,dd,h3{margin:0;padding:0;list-style:none}input{padding-top:0;padding-bottom:0;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}table,img{border:0}td{font-size:9pt;line-height:18px}em{font-style:normal;color:#c00}a em{text-decoration:underline}cite{font-style:normal;color:green}.m,a.m{color:#666}a.m:visited{color:#606}.g,a.g{color:green}.c{color:#77c}.f14{font-size:14px}.f10{font-size:10.5pt}.f16{font-size:16px}.f13{font-size:13px}.bg{background-image:url(http:\/\/s1.bdstatic.com\/r\/www\/cache\/static\/global\/img\/icons_5859e57.png);_background-image:url(http:\/\/s1.bdstatic.com\/r\/www\/cache\/static\/global\/img\/icons_d5b04cc.gif);background-repeat:no-repeat}#u,#head,#tool,#search,#foot{font-size:12px}.logo{width:117px;height:38px;cursor:pointer}.p1{line-height:120%;margin-left:-12pt}.p2{width:100%;line-height:120%;margin-left:-12pt}#wrapper{_zoom:1}#container{word-break:break-all;word-wrap:break-word}.container_s{width:1002px}.container_l{width:1222px}#content_left{width:636px;float:left;padding-left:35px}#content_right{border-left:1px solid #e1e1e1;float:right}.container_s #content_right{width:271px}.container_l #content_right{width:434px}.content_none{padding-left:35px}#u{color:#999;white-space:nowrap;position:absolute;right:10px;top:4px;z-index:299}#u a{color:#00c;margin:0 5px}#u .reg{margin:0}#u .last{margin-right:0}#u .un{font-weight:700;margin-right:5px}#u ul{width:100%;background:#fff;border:1px solid #9b9b9b}#u li{height:25px}#u li a{width:100%;height:25px;line-height:25px;display:block;text-align:left;text-decoration:none;text-indent:6px;margin:0;filter:none\\9}#u li a:hover{background:#ebebeb}#u li.nl{border-top:1px solid #ebebeb}#user{display:inline-block}#user_center{position:relative;display:inline-block}#user_center .user_center_btn{margin-right:5px}.userMenu{width:64px;position:absolute;right:7px;_right:2px;top:15px;top:14px\\9;*top:15px;padding-top:4px;display:none;*background:#fff}#head{padding-left:35px;margin-bottom:20px;width:900px}.fm{clear:both;position:relative;z-index:297}.nv a,.nv b,.btn,#page,#more{font-size:14px}.s_nav{height:45px}.s_nav .s_logo{margin-right:20px;float:left}.s_nav .s_logo img{border:0;display:block}.s_tab{line-height:18px;padding:20px 0 0;float:left}.s_nav a{color:#00c;font-size:14px}.s_nav b{font-size:14px}.s_ipt_wr{width:536px;height:30px;display:inline-block;margin-right:5px;background-position:0 -96px;border:1px solid #b6b6b6;border-color:#7b7b7b #b6b6b6 #b6b6b6 #7b7b7b;vertical-align:top}.s_ipt{width:523px;height:22px;font:16px\/18px arial;line-height:22px\\9;margin:5px 0 0 7px;padding:0;background:#fff;border:0;outline:0;-webkit-appearance:none}.s_btn{width:95px;height:32px;padding-top:2px\\9;font-size:14px;padding:0;background-color:#ddd;background-position:0 -48px;border:0;cursor:pointer}.s_btn_h{background-position:-240px -48px}.s_btn_wr{width:97px;height:34px;display:inline-block;background-position:-120px 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234 result_common_css=$(result_common_css);
235 result_common_css.attr("data-for","result");
236
237 var index_css= $('head [index]');
238 var wrapper=$("#wrapper");
239 window.index_on=function(){
240 index_css.insertAfter("meta:eq(0)");
241 result_common_css.remove();
242 wrapper.show();
243 if(bds.su&&bds.su.U&&bds.su.U.homeInit){
244 bds.su.U.homeInit();
245 }
246 //$("#wrapper_wrapper").remove();
247 };
248 window.index_off=function(){
249 //不能操作dom，只能改css，否则会丢失输入法状态
250 result_common_css.insertAfter("meta:eq(0)");
251 wrapper.show();
252 index_css.remove();
253
254 //$("<div id='wrapper_wrapper'></div>").appendTo("#wrapper");
255 };
256 })();
257
258 //首页UA diff 监控
259 $(window).on("load",function() {
260
261 var rand = Math.random();
262
263 if(rand < 0.01) {
264 try {
265 var baseUrl = "//www.baidu.com/nocache/fesplg/s.gif?log_type=hm&type=uamonitor&",
266 queryString = "";
267
268 queryString += "&c_ua=" + encodeURIComponent(navigator.userAgent);
269 queryString += "&s_ua=" + encodeURIComponent(bds.comm.userAgent);
270
271 var url=baseUrl+queryString,
272 img = new Image(),
273 img_rand="_LOG_"+new Date().getTime();
274 img.onload=function(){
275 delete window[img_rand];
276 };
277 window[img_rand]=img;
278 img.src=url;
279 } catch(e) {};
280 }
281 });
282
283 </script>
284
285 <script type="text/javascript">var Cookie={set:function(e,t,o,i,s,n){document.cookie=e+"="+(n?t:escape(t))+(s?"; expires="+s.toGMTString():"")+(i?"; path="+i:"; path=/")+(o?"; domain="+o:"")},get:function(e,t){var o=document.cookie.match(new RegExp("(^| )"+e+"=([^;]*)(;|$)"));return null!=o?unescape(o[2]):t},clear:function(e,t,o){this.get(e)&&(document.cookie=e+"="+(t?"; path="+t:"; path=/")+(o?"; domain="+o:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT")}};!function(){function save(e){var t=[];for(tmpName in options)options.hasOwnProperty(tmpName)&&"duRobotState"!==tmpName&&t.push('"'+tmpName+'":"'+options[tmpName]+'"');
286 var o="{"+t.join(",")+"}";bds.comm.personalData?$.ajax({url:"//www.baidu.com/ups/submit/addtips/?product=ps&tips="+encodeURIComponent(o)+"&_r="+(new Date).getTime(),success:function(){writeCookie(),"function"==typeof e&&e()}}):(writeCookie(),"function"==typeof e&&setTimeout(e,0))}function set(e,t){options[e]=t}function get(e){return options[e]}function writeCookie(){if(options.hasOwnProperty("sugSet")){var e="0"==options.sugSet?"0":"3";clearCookie("sug"),Cookie.set("sug",e,document.domain,"/",expire30y)
287 }if(options.hasOwnProperty("sugStoreSet")){var e=0==options.sugStoreSet?"0":"1";clearCookie("sugstore"),Cookie.set("sugstore",e,document.domain,"/",expire30y)}if(options.hasOwnProperty("isSwitch")){var t={0:"2",1:"0",2:"1"},e=t[options.isSwitch];clearCookie("ORIGIN"),Cookie.set("ORIGIN",e,document.domain,"/",expire30y)}if(options.hasOwnProperty("imeSwitch")){var e=options.imeSwitch;clearCookie("bdime"),Cookie.set("bdime",e,document.domain,"/",expire30y)}}function writeBAIDUID(){var e,t,o,i=Cookie.get("BAIDUID");
288 /FG=(\d+)/.test(i)&&(t=RegExp.$1),/SL=(\d+)/.test(i)&&(o=RegExp.$1),/NR=(\d+)/.test(i)&&(e=RegExp.$1),options.hasOwnProperty("resultNum")&&(e=options.resultNum),options.hasOwnProperty("resultLang")&&(o=options.resultLang),Cookie.set("BAIDUID",i.replace(/:.*$/,"")+("undefined"!=typeof o?":SL="+o:"")+("undefined"!=typeof e?":NR="+e:"")+("undefined"!=typeof t?":FG="+t:""),".baidu.com","/",expire30y,!0)}function clearCookie(e){Cookie.clear(e,"/"),Cookie.clear(e,"/",document.domain),Cookie.clear(e,"/","."+document.domain),Cookie.clear(e,"/",".baidu.com")
289 }function reset(e){options=defaultOptions,save(e)}var defaultOptions={sugSet:1,sugStoreSet:1,isSwitch:1,isJumpHttps:1,imeSwitch:0,resultNum:10,skinOpen:1,resultLang:0,duRobotState:"000"},options={},tmpName,expire30y=new Date;expire30y.setTime(expire30y.getTime()+94608e7);try{if(bds&&bds.comm&&bds.comm.personalData){if("string"==typeof bds.comm.personalData&&(bds.comm.personalData=eval("("+bds.comm.personalData+")")),!bds.comm.personalData)return;for(tmpName in bds.comm.personalData)defaultOptions.hasOwnProperty(tmpName)&&bds.comm.personalData.hasOwnProperty(tmpName)&&"SUCCESS"==bds.comm.personalData[tmpName].ErrMsg&&(options[tmpName]=bds.comm.personalData[tmpName].value)
290 }try{parseInt(options.resultNum)||delete options.resultNum,parseInt(options.resultLang)||"0"==options.resultLang||delete options.resultLang}catch(e){}writeCookie(),"sugSet"in options||(options.sugSet=3!=Cookie.get("sug",3)?0:1),"sugStoreSet"in options||(options.sugStoreSet=Cookie.get("sugstore",0));var BAIDUID=Cookie.get("BAIDUID");"resultNum"in options||(options.resultNum=/NR=(\d+)/.test(BAIDUID)&&RegExp.$1?parseInt(RegExp.$1):10),"resultLang"in options||(options.resultLang=/SL=(\d+)/.test(BAIDUID)&&RegExp.$1?parseInt(RegExp.$1):0),"isSwitch"in options||(options.isSwitch=2==Cookie.get("ORIGIN",0)?0:1==Cookie.get("ORIGIN",0)?2:1),"imeSwitch"in options||(options.imeSwitch=Cookie.get("bdime",0))
291 }catch(e){}window.UPS={writeBAIDUID:writeBAIDUID,reset:reset,get:get,set:set,save:save}}(),function(){var e="http://s1.bdstatic.com/r/www/cache/static/plugins/every_cookie_a70bc15.js";("Mac68K"==navigator.platform||"MacPPC"==navigator.platform||"Macintosh"==navigator.platform||"MacIntel"==navigator.platform)&&(e="http://s1.bdstatic.com/r/www/cache/static/plugins/every_cookie_mac_82990d4.js"),setTimeout(function(){$.ajax({url:e,cache:!0,dataType:"script"})},0);var t=navigator&&navigator.userAgent?navigator.userAgent:"",o=document&&document.cookie?document.cookie:"",i=!!(t.match(/(msie [2-8])/i)||t.match(/windows.*safari/i)&&!t.match(/chrome/i)||t.match(/(linux.*firefox)/i)||t.match(/Chrome\/29/i)||t.match(/mac os x.*firefox/i)||o.match(/\bISSW=1/)||0==UPS.get("isSwitch"));
292 bds&&bds.comm&&(bds.comm.supportis=!i,bds.comm.isui=!0),window.__restart_confirm_timeout=!0,window.__confirm_timeout=8e3,window.__disable_is_guide=!0,window.__disable_swap_to_empty=!0,window.__switch_add_mask=!0;var s="http://s1.bdstatic.com/r/www/cache/static/global/js/all_async_search_0ecb2f2.js",n="/script";document.write("<script src='"+s+"'><"+n+">"),bds.comm.newindex&&$(window).on("index_off",function(){$('<div class="c-tips-container" id="c-tips-container"></div>').insertAfter("#wrapper"),window.__sample_dynamic_tab&&$("#s_tab").remove()
293 }),bds.comm&&bds.comm.ishome&&Cookie.get("H_PS_PSSID")&&(bds.comm.indexSid=Cookie.get("H_PS_PSSID"))}();</script>
294
295
296
297 <script>
298 if(bds.comm.supportis){
299 window.__restart_confirm_timeout=true;
300 window.__confirm_timeout=8000;
301 window.__disable_is_guide=true;
302 window.__disable_swap_to_empty=true;
303 }
304 initPreload({
305 'isui':true,
306 'index_form':"#form",
307 'index_kw':"#kw",
308 'result_form':"#form",
309 'result_kw':"#kw"
310 });
311 </script>
312
313 <script>
314 if(navigator.cookieEnabled){
315 document.cookie="NOJS=;expires=Sat, 01 Jan 2000 00:00:00 GMT";
316 }
317 </script>
318
319
320
321 </body>
322 </html>
2.分析扒网页的方法
那么我们来分析这两行代码，第一行
1 request = urllib2.Request("http://www.baidu.com")
首先调用的是urllib2库里面的urlopen方法，传入一个URL，这个网址是百度首页，协议是HTTP协议，当然你也可以把HTTP换做FTP,FILE,HTTPS 等等，只是代表了一种访问控制协议，urlopen一般接受三个参数，它的参数如下：
1 urlopen(url, data, timeout)
第一个参数url即为URL，第二个参数data是访问URL时要传送的数据，第三个timeout是设置超时时间。
第二三个参数是可以不传送的，data默认为空None，timeout默认为 socket._GLOBAL_DEFAULT_TIMEOUT
第一个参数URL是必须要传送的，在这个例子里面我们传送了百度的URL，执行urlopen方法之后，返回一个response对象，返回信息便保存在这里面。
1 print response.read()
response对象有一个read方法，可以返回获取到的网页内容。
如果不加read直接打印会是什么？答案如下：
1 <addinfourl at 139728495260376 whose fp = <socket._fileobject object at 0x7f1513fb3ad0>>
直接打印出了该对象的描述，所以记得一定要加read方法
3.构造Request
其实上面的urlopen参数可以传入一个request请求,其实就是一个Request类的实例，构造时需要传入Url,Data等等的内容。比如上面的两行代码，可以这么改写
1 import urllib2
2
3 request = urllib2.Request("http://www.baidu.com")
4 response = urllib2.urlopen(request)
5 print response.read()
运行结果是完全一样的，只不过中间多了一个request对象，推荐大家这么写，因为在构建请求时还需要加入好多内容，通过构建一个request，服务器响应请求得到应答，这样显得逻辑上清晰明确。
4.POST和GET数据传送
上面的程序演示了最基本的网页抓取，不过，现在大多数网站都是动态网页，需要你动态地传递参数给它，它做出对应的响应。所以，在访问时，我们需要传递数据给它。最常见的情况是什么？对了，就是登录注册的时候呀。
把数据用户名和密码传送到一个URL，然后你得到服务器处理之后的响应，这个该怎么办？下面揭晓吧！
数据传送分为POST和GET两种方式，两种方式有什么区别呢？
最重要的区别是GET方式是直接以链接形式访问，链接中包含了所有的参数，当然如果包含了密码的话是一种不安全的选择，不过你可以直观地看到自己提交了什么内容。POST则不会在网址上显示所有的参数，不过如果你想直接查看提交了什么就不太方便了，大家可以酌情选择。
POST方式：
上面我们说了data参数是干嘛的？对了，它就是用在这里的，我们传送的数据就是这个参数data，下面演示一下POST方式。
1 import urllib
2 import urllib2
3
4 values = {"username":"1016903103@qq.com","password":"XXXX"}
5 data = urllib.urlencode(values)
6 url = "https://passport.csdn.net/account/login?from=http://my.csdn.net/my/mycsdn"
7 request = urllib2.Request(url,data)
8 response = urllib2.urlopen(request)
9 print response.read()
引入了urllib库，模拟登陆CSDN，当然上述代码可能登陆不进去，因为CSDN还有个流水号的字段，没有设置全，比较复杂在这里就不写上去了，在此只是说明登录的原理。一般的登录网站一般是这种写法。
我们需要定义一个字典，名字为values，参数我设置了username和password，下面利用urllib的urlencode方法将字典编码，命名为data，构建request时传入两个参数，url和data，运行程序，返回的便是POST后呈现的页面内容。
注意上面字典的定义方式还有一种，下面的写法是等价的
1 import urllib
2 import urllib2
3
4 values = {}
5 values['username'] = "1016903103@qq.com"
6 values['password'] = "XXXX"
7 data = urllib.urlencode(values)
8 url = "http://passport.csdn.net/account/login?from=http://my.csdn.net/my/mycsdn"
9 request = urllib2.Request(url,data)
10 response = urllib2.urlopen(request)
11 print response.read()
以上方法便实现了POST方式的传送
GET方式：
至于GET方式我们可以直接把参数写到网址上面，直接构建一个带参数的URL出来即可。
1 import urllib
2 import urllib2
3
4 values={}
5 values['username'] = "1016903103@qq.com"
6 values['password']="XXXX"
7 data = urllib.urlencode(values)
8 url = "http://passport.csdn.net/account/login"
9 geturl = url + "?"+data
10 request = urllib2.Request(geturl)
11 response = urllib2.urlopen(request)
12 print response.read()
print geturl，打印输出一下url，发现其实就是原来的url加？然后加编码后的参数
1 http://passport.csdn.net/account/login?username=1016903103%40qq.com&password=XXXX
和平常GET访问方式一模一样，这样就实现了数据的GET方式传送。
来源：https://www.cnblogs.com/qianyuliang/p/6651122.html