Python常用库urllib中urllib.request模块使用详解

矫情吗；* 2022-04-03 01:44 285阅读 0赞

#  1.urllib2和urllib库的区别      #

Urllib库是Python中的一个功能强大、用于操作URL，并在做爬虫的时候经常要用到的库。在Python2.x中，分为Urllib库和Urllin2库，Python3.x之后都合并到Urllib库中了。**实际开发中，用Requests多余urllib.**

**这里介绍使用的python3中的urllib库包括以下模块**

1.  **urllib.request 请求模块**
2.  **urllib.error 异常处理模块**
3.  **urllib.parse url解析模块**
4.  **urllib.robotparser robots.txt   解析模块**

**  urllib和urllib2库中模块的主要变化有：**

1.  在Pytho2.x中使用import urllib2=====>在Python3.x中会使用import urllib.request，urllib.error。
2.  在Pytho2.x中使用import urllib=====>在Python3.x中会使用import urllib.request，urllib.error，urllib.parse。
3.  在Pytho2.x中使用import urlparse=====>在Python3.x中会使用import urllib.parse。
4.  在Pytho2.x中使用import urlopen=====>在Python3.x中会使用import urllib.request.urlopen。
5.  在Pytho2.x中使用import urlencode=====>在Python3.x中会使用import urllib.parse.urlencode。
6.  在Pytho2.x中使用import urllib.quote=====>在Python3.x中会使用import urllib.request.quote。
7.  在Pytho2.x中使用cookielib.CookieJa=====>在Python3.x中会使用http.CookieJar。
8.  在Pytho2.x中使用urllib2.Request——-对应的，在Python3.x中会使用urllib.request.Request。

# 2. python3中的urllib的使用详解 #

学习的官方文档地址：[urllib的官网学习文档地址][urllib]

# 3.**urllib.request 请求模块的使用详解** #

### ** 3.1 urllib.request.urlopen的用法** ###

**    urlopen使用格式与参数解释：**

**   ** ** urllib.request.urlopen(url, data=None, \[timeout, \]\*, cafile=None, capath=None, cadefault=False, context=None)**

**  1.urlopen()只有一个参数url**

import urllib.request
    
    response = urllib.request.urlopen('http://www.baidu.com')
    print(response.read().decode('utf-8'))
    注意如果在pycharm非命令行模式直接用print(response.read())即可。
    
    使用response对象的read()方法读取网页内容，然后打印出来，因为读取的网页内容字节流，所以要打印时要转成utf-8格式
    读取内容常见的有3种方式，其用法是： 
    1. read()读取文件的全部内容，与readlines()不同的是，read()会把读取到的内容赋给一个字符串变量。 
    2. readlines()读取文件的全部内容，readlines()会把读取到的内容赋值给一个列表变量。 
    3. readline()读取文件的一行内容。
    --------------------- 
    
    1.这是时候可以将爬取的网页内容保存到本地
    #注意这里response对象的内容只能读取一次，使用一次read（）,再次read()是空值，跟一般文件读取一样。
    
    '''方法1：将爬取的网页内容存储到本地
    f = open('./a.html','wb')
    f.write(t)
    f.close()'''
    
    #方法2：保存为html文件，可以直接使用浏览器打开验证。
    with open('./b.html','wb') as f:
        f.write(t)
        f.close()
    
    2.可以指定显示爬取的网页中部分信息
    print(response.info())
    print(response.geturl())
    print(response.getcode())

** 如上：可以看出，urlopen中的参数除了请求网页url是必须的，其余都是可选择的参数，同样如下：**

from urllib import request
    
    with request.urlopen('https://baidu.com') as f:
        data = f.read()  #读取响应的数据
        print('Status:', f.status, f.reason)
        for k, v in f.getheaders():  #遍历打印响应头数据，json格式，跟浏览器格式一样
            print('%s: %s' % (k, v))
        print('Data:', data)  #如果在交互模式下，需要是用decode()进行转换
    
    '''程序运行结果如下：
    Status: 200 OK
    Date: Thu, 20 Dec 2018 08:10:48 GMT
    Content-Type: text/html
    Transfer-Encoding: chunked
    Connection: Close
    Vary: Accept-Encoding
    Set-Cookie: BAIDUID=348DA5244A4C87E823EE2DC9D5659A14:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
    Set-Cookie: BIDUPSID=348DA5244A4C87E823EE2DC9D5659A14; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
    Set-Cookie: PSTM=1545293448; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com
    Set-Cookie: delPer=0; path=/; domain=.baidu.com
    Set-Cookie: BDSVRTM=0; path=/
    Set-Cookie: BD_HOME=0; path=/
    Set-Cookie: H_PS_PSSID=26525_1423_21078_18560_28132_26350_27750_28140; path=/; domain=.baidu.com
    P3P: CP=" OTI DSP COR IVA OUR IND COM "
    Cxy_all: baidu+02d0ae63f27832db9f1ff400b8273995
    Cache-Control: private
    Expires: Thu, 20 Dec 2018 08:10:40 GMT
    Server: BWS/1.1
    X-UA-Compatible: IE=Edge,chrome=1
    BDPAGETYPE: 1
    BDQID: 0x8b38ae5c0005a450
    Data: b'<!DOCTYPE html>\n\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\t\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\t\r\n        \r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\t\t    \r\n\r\n\t\r\n        \r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\r\n\t\t\t        \r\n\t\t\t    \r\n\r\n\r\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n<html>\n<head>\n    \n    <meta http-equiv="content-type" content="text/html;charset=utf-8">\n    <meta http-equiv="X-UA-Compatible" content="IE=Edge">\n\t<meta content="always" name="referrer">\n    <meta name="theme-color" content="#2932e1">\n    <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />\n    <link rel="search" type="application/opensearchdescription+xml" href="/content-search.xml" title="\xe7\x99\xbe\xe5\xba\xa6\xe6\x90\x9c\xe7\xb4\xa2" />\n    <link rel="icon" sizes="any" mask href="//www.baidu.com/img/baidu_85beaf5496f291521eb75ba38eacbd87.svg">\n\t\n\t\n\t<link rel="dns-prefetch" href="//s1.bdstatic.com"/>\n\t<link rel="dns-prefetch" href="//t1.baidu.com"/>\n\t<link rel="dns-prefetch" href="//t2.baidu.com"/>\n\t<link rel="dns-prefetch" href="//t3.baidu.com"/>\n\t<link rel="dns-prefetch" href="//t10.baidu.com"/>\n\t<link rel="dns-prefetch" href="//t11.baidu.com"/>\n\t<link rel="dns-prefetch" href="//t12.baidu.com"/>\n\t<link rel="dns-prefetch" href="//b1.bdstatic.com"/>\n    \n    <title>\xe7\x99\xbe\xe5\xba\xa6\xe4\xb8\x80\xe4\xb8\x8b\xef\xbc\x8c\xe4\xbd\xa0\xe5\xb0\xb1\xe7\x9f\xa5\xe9\x81\x93</title>\n    \n\n<style id="css_index" index="index" type="text/css">html,body{height:100%}\nhtml{overflow-y:auto}\nbody{font:12px arial;text-align:;background:#fff}\nbody,p,form,ul,li{margin:0;padding:0;list-style:none}\nbody,form,#fm{position:relative}\ntd{text-align:left}\nimg{border:0}\na{color:#00c}\na:active{color:#f60}\ninput{border:0;padding:0}\n#wrapper{position:relative;_position:;min-height:100%}\n#head{padding-bottom:100px;text-align:center;*z-index:1}\n#ftCon{height:50px;position:absolute;bottom:47px;text-align:left;width:100%;margin:0 auto;z-index:0;overflow:hidden}\n.ftCon-Wrapper{overflow:hidden;margin:0 auto;text-align:center;*width:640px}\n.qrcodeCon{text-align:center;position:absolute;bottom:140px;height:60px;width:100%}\n#qrcode{display:inline-block;*float:left;*margin-top:4px}\n#qrcode .qrcode-item{float:left}\n#qrcode .qrcode-item-2{margin-left:33px}\n#qrcode .qrcode-img{width:60px;height:60px}\n#qrcode .qrcode-item-1 .qrcode-img{background:url(http://s1.bdstatic.com/r/www/cache/static/home/img/qrcode/zbios_efde696.png) 0 0 no-repeat}\n#qrcode .qrcode-item-2 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a{margin-left:62px}\n#lh #seth,#lh #setf{margin-left:0}\n#lk{position:absolute;display:none;top:0;right:0;margin:33px 0}\n#lk span{font:14px "\xe5\xae\x8b\xe4\xbd\x93"}\n#nv{position:absolute;display:none;top:0;right:0}\n#lm{color:#666;width:100%;height:60px;margin-top:60px;line-height:15px;font-size:13px;position:absolute;top:0;left:0}\n#lm a{color:#666}\n#pad-version{line-height:40px}\n.s_ipt_wr.bg,.s_btn_wr.bg,#su.bg{background-image:none}\n.s_btn_wr{width:auto;height:auto;border-bottom:1px solid transparent;*border-bottom:0}\n.s_btn{width:100px;height:36px;color:#fff;font-size:15px;letter-spacing:1px;background:#3385ff;border-bottom:1px solid #2d78f4;outline:medium;*border-bottom:0;-webkit-appearance:none;-webkit-border-radius:0}\n.s_btn.btnhover{background:#317ef3;border-bottom:1px solid #2868c8;*border-bottom:0;box-shadow:1px 1px 1px #ccc}\n.s_btn_h{background:#3075dc;box-shadow:inset 1px 1px 5px #2964bb;-webkit-box-shadow:inset 1px 1px 5px #2964bb;-moz-box-shadow:inset 1px 1px 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result_common_css.attr("data-for","result");\n\n    var index_css= $(\'head [index]\');\n    var wrapper=$("#wrapper");\n    window.index_on=function(){\n        index_css.insertAfter("meta:eq(0)");\n        result_common_css.remove();\n        wrapper.show();\n        if(bds.su&&bds.su.U&&bds.su.U.homeInit){\n            bds.su.U.homeInit();\n        }\n        //$("#wrapper_wrapper").remove();\n    };\n    window.index_off=function(){\n        //\xe4\xb8\x8d\xe8\x83\xbd\xe6\x93\x8d\xe4\xbd\x9cdom\xef\xbc\x8c\xe5\x8f\xaa\xe8\x83\xbd\xe6\x94\xb9css\xef\xbc\x8c\xe5\x90\xa6\xe5\x88\x99\xe4\xbc\x9a\xe4\xb8\xa2\xe5\xa4\xb1\xe8\xbe\x93\xe5\x85\xa5\xe6\xb3\x95\xe7\x8a\xb6\xe6\x80\x81\n        result_common_css.insertAfter("meta:eq(0)");\n        wrapper.show();\n        index_css.remove();\n\n        //$("<div id=\'wrapper_wrapper\'></div>").appendTo("#wrapper");\n    };\n})();\n\n//\xe9\xa6\x96\xe9\xa1\xb5UA diff \xe7\x9b\x91\xe6\x8e\xa7\n$(window).on("load",function() {\n\n\tvar rand = Math.random();\n\n\tif(rand < 0.01) {\n\t\ttry {\n\t\tvar baseUrl = "//www.baidu.com/nocache/fesplg/s.gif?log_type=hm&type=uamonitor&",\n\t\t\tqueryString = "";\n\n\t\tqueryString += "&c_ua=" + encodeURIComponent(navigator.userAgent);\n\t\tqueryString += "&s_ua=" + encodeURIComponent(bds.comm.userAgent);\n\n\t\tvar url=baseUrl+queryString,\n\t\t\timg = new Image(),\n\t\t\timg_rand="_LOG_"+new Date().getTime();\n\t\timg.onload=function(){\n\t\t\tdelete window[img_rand];\n\t\t};\n\t\twindow[img_rand]=img;\n\t\timg.src=url;\n\t\t} catch(e) {};\n\t}\n});\n\n</script>\n\n<script type="text/javascript">var Cookie={set:function(t,e,o,i,s,n){document.cookie=t+"="+(n?e:escape(e))+(s?"; expires="+s.toGMTString():"")+(i?"; path="+i:"; path=/")+(o?"; domain="+o:"")},get:function(t,e){var o=document.cookie.match(new RegExp("(^| )"+t+"=([^;]*)(;|$)"));return null!=o?unescape(o[2]):e},clear:function(t,e,o){this.get(t)&&(document.cookie=t+"="+(e?"; path="+e:"; path=/")+(o?"; domain="+o:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT")}};!function(){function save(t){var e=[];for(tmpName in options)options.hasOwnProperty(tmpName)&&"duRobotState"!==tmpName&&e.push(\'"\'+tmpName+\'":"\'+options[tmpName]+\'"\');\nvar o="{"+e.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 t&&t()}}):(writeCookie(),"function"==typeof t&&setTimeout(t,0))}function set(t,e){options[t]=e}function get(t){return options[t]}function writeCookie(){if(options.hasOwnProperty("sugSet")){var t="0"==options.sugSet?"0":"3";clearCookie("sug"),Cookie.set("sug",t,document.domain,"/",expire30y)\n}if(options.hasOwnProperty("sugStoreSet")){var t=0==options.sugStoreSet?"0":"1";clearCookie("sugstore"),Cookie.set("sugstore",t,document.domain,"/",expire30y)}if(options.hasOwnProperty("isSwitch")){var e={0:"2",1:"0",2:"1"},t=e[options.isSwitch];clearCookie("ORIGIN"),Cookie.set("ORIGIN",t,document.domain,"/",expire30y)}if(options.hasOwnProperty("imeSwitch")){var t=options.imeSwitch;clearCookie("bdime"),Cookie.set("bdime",t,document.domain,"/",expire30y)}}function writeBAIDUID(){var t,e,o,i=Cookie.get("BAIDUID");\n/FG=(\\d+)/.test(i)&&(e=RegExp.$1),/SL=(\\d+)/.test(i)&&(o=RegExp.$1),/NR=(\\d+)/.test(i)&&(t=RegExp.$1),options.hasOwnProperty("resultNum")&&(t=options.resultNum),options.hasOwnProperty("resultLang")&&(o=options.resultLang),Cookie.set("BAIDUID",i.replace(/:.*$/,"")+("undefined"!=typeof o?":SL="+o:"")+("undefined"!=typeof t?":NR="+t:"")+("undefined"!=typeof e?":FG="+e:""),".baidu.com","/",expire30y,!0)}function clearCookie(t){Cookie.clear(t,"/"),Cookie.clear(t,"/",document.domain),Cookie.clear(t,"/","."+document.domain),Cookie.clear(t,"/",".baidu.com")\n}function reset(t){options=defaultOptions,save(t)}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)\n}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.$1):0),"isSwitch"in options||(options.isSwitch=2==Cookie.get("ORIGIN",0)?0:1==Cookie.get("ORIGIN",0)?2:1),"imeSwitch"in options||(options.imeSwitch=Cookie.get("bdime",0))\n}catch(e){}window.UPS={writeBAIDUID:writeBAIDUID,reset:reset,get:get,set:set,save:save}}(),function(){var t="http://s1.bdstatic.com/r/www/cache/static/plugins/every_cookie_4644b13.js";("Mac68K"==navigator.platform||"MacPPC"==navigator.platform||"Macintosh"==navigator.platform||"MacIntel"==navigator.platform)&&(t="http://s1.bdstatic.com/r/www/cache/static/plugins/every_cookie_mac_82990d4.js"),setTimeout(function(){$.ajax({url:t,cache:!0,dataType:"script"})},0);var e=navigator&&navigator.userAgent?navigator.userAgent:"",o=document&&document.cookie?document.cookie:"",i=!!(e.match(/(msie [2-8])/i)||e.match(/windows.*safari/i)&&!e.match(/chrome/i)||e.match(/(linux.*firefox)/i)||e.match(/Chrome\\/29/i)||e.match(/mac os x.*firefox/i)||o.match(/\\bISSW=1/)||0==UPS.get("isSwitch"));\nbds&&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_8936f95.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&&$("#s_tab").remove()\n}),bds.comm&&bds.comm.ishome&&Cookie.get("H_PS_PSSID")&&(bds.comm.indexSid=Cookie.get("H_PS_PSSID"));var a=$(document).find("#s_tab").find("a");a&&a.length>0&&a.each(function(t,e){e.innerHTML&&e.innerHTML.match(/\xe6\x96\xb0\xe9\x97\xbb/)&&(e.innerHTML="\xe8\xb5\x84\xe8\xae\xaf",e.href="//www.baidu.com/s?rtt=1&bsst=1&cl=2&tn=news&word=",e.setAttribute("sync",!0))})}();</script>\n\n\n\n<script>\nif(bds.comm.supportis){\n    window.__restart_confirm_timeout=true;\n    window.__confirm_timeout=8000;\n    window.__disable_is_guide=true;\n    window.__disable_swap_to_empty=true;\n}\ninitPreload({\n    \'isui\':true,\n    \'index_form\':"#form",\n    \'index_kw\':"#kw",\n    \'result_form\':"#form",\n    \'result_kw\':"#kw"\n});\n</script>\n\n<script>\nif(navigator.cookieEnabled){\n\tdocument.cookie="NOJS=;expires=Sat, 01 Jan 2000 00:00:00 GMT";\n}\n</script>\n\n\n\n</body>\n</html>\n\n\r\n\n\n\r\n'
    
    '''

**2.urlopen的参数timeout**

#设置超时时间为1s.
    import urllib.request
    response = urllib.request.urlopen('http://httpbin.org/get', timeout=1)
    print(response.read())
    
    #超时异常处理,设置超时0.1s
    import socket
    import urllib.request
    import urllib.error
    
    try:
        response = urllib.request.urlopen('http://httpbin.org/get', timeout=0.1)
    except urllib.error.URLError as e:
        if isinstance(e.reason, socket.timeout):
            print('TIME OUT') #结果是TIME OUT

**3.urlopen中data参数的使用**

import urllib.parse
    import urllib.request
    
    data = bytes(urllib.parse.urlencode({'word': 'hello'}), encoding='utf8')
    response = urllib.request.urlopen('http://httpbin.org/post', data=data)
    print(response.read())

### 3.2urllib.request请求模块中关于响应的使用 ###

**1.响应类型**

import urllib.request
    import  os
    
    response = urllib.request.urlopen('http://www.baidu.com',timeout=1)
    print(type(response)) 
    '''
    正常结果：<class 'http.client.HTTPResponse'> 
    如果超时，则报错，需要捕捉异常urllib.error.URLError: <urlopen error timed out>

**2.状态码、响应头**

import urllib.request
    import  os
    
    response = urllib.request.urlopen('http://www.baidu.com',timeout=1)
    
    print(response.status)  #响应状态，200正常。
    print(response.getheaders())  #响应头
    print(response.getheader('Server'))
    '''结果如下：
    200
    [('Server', 'styx'), ('Date', 'Wed, 19 Dec 2018 13:57:19 GMT'), ('Content-Type', 'text/html; charset=UTF-8'), ('Transfer-Encoding', 'chunked'), ('Connection', 'close'), ('Vary', 'Accept-Encoding'), ('Expires', 'Wed, 19 Dec 2018 13:56:33 GMT'), ('Last-Modified', 'Wed, 19 Dec 2018 13:56:33 GMT'), ('Pragma', 'Pragma'), ('Cache-Control', 'max-age=300'), ('X-Cache', 'Suning-HIT_94'), ('X-Cache-Hits', '7'), ('Age', '0'), ('Via', '1.1 Xcache_baidu_94')]
    styx
    
    '''

### 3.3 urlopen.request.Request ###

** Request就是为了模拟浏览器发送GET请求，通过往`Request`对象添加HTTP头，我们就可以把请求伪装成浏览器，最终还是通过urlopen()进行发送请求。**

**1.如下代码演示Request发送get请求**

from urllib import request
    
    #封装一个请求,给请求添加一个请求头，伪装成iphone手机访问淘宝，返回的淘宝界面就是手机版的
    
    req = request.Request('http://www.taobao.com/')
    req.add_header('User-Agent', 'Mozilla/6.0 (iPhone; CPU iPhone OS 8_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/8.0 Mobile/10A5376e Safari/8536.25')
    response = request.urlopen(req)
    with open("./taobao.html",'wb')  as f1:
        f1.write(response.read())
        f1.close()
    
    '''或者直接将网页内容打印出来，发现返回的是淘宝触屏版，适应iphone尺寸。
    with request.urlopen(req) as f:
        print('Status:', f.status, f.reason)
        for k, v in f.getheaders():
            print('%s: %s' % (k, v))
        print('Data:', f.read().decode('utf-8'))
    '''

**2.Request发送post请求**

from urllib import request, parse
    
    url = 'http://httpbin.org/post'
    dict = {
        'name': 'Germey'
    }
    data = bytes(parse.urlencode(dict), encoding='utf8')
    req = request.Request(url=url, data=data, method='POST')
    req.add_header('User-Agent', 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)')
    response = request.urlopen(req)
    print(response.read().decode('utf-8'))
    
    '''测试结果如下：
    {
      "args": {},
      "data": "",
      "files": {},
      "form": {
        "name": "Germey"
      },
      "headers": {
        "Accept-Encoding": "identity",
        "Connection": "close",
        "Content-Length": "11",
        "Content-Type": "application/x-www-form-urlencoded",
        "Host": "httpbin.org",
        "User-Agent": "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)"
      },
      "json": null,
      "origin": "180.111.83.197",
      "url": "http://httpbin.org/post"
    }
    '''
    -------------------------------------------------------------------------
    2.发送post请求方式2.这种添加方式有个好处是自己可以定义一个请求头字典，然后循环进行添加
    from urllib import request, parse
    
    url = 'http://httpbin.org/post'
    dict = {
        'name': 'Germey'
    }
    data = bytes(parse.urlencode(dict), encoding='utf8')
    req = request.Request(url=url, data=data, method='POST')
    req.add_header('User-Agent', 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)')
    response = request.urlopen(req)
    print(response.read().decode('utf-8'))

### 3.4Hander的使用 ###

有很多网站为了防止程序爬虫爬网站造成网站瘫痪，会需要携带一些headers头部信息才能访问，最长见的有user-agent参数等参数，演示如下：

**1.添加普通Hander**

1.如下是对python官网的请求访问，什么参数也不带
    import urllib.request
    
    request = urllib.request.Request('https://python.org')
    response = urllib.request.urlopen(request)
    print(response.read().decode('utf-8'))
    
    2.对上面的请求添加伪装请求头
    from urllib import request, parse
    
    url = 'http://httpbin.org/post'
    headers = {
        'User-Agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)',
        'Host': 'httpbin.org'
    }
    dict = {
        'name': 'zhaofan'
    }
    data = bytes(parse.urlencode(dict), encoding='utf8')
    req = request.Request(url=url, data=data, headers=headers, method='POST')
    response = request.urlopen(req)
    print(response.read().decode('utf-8'))

**2.ProxyHandler通过rulllib.request.ProxyHandler()可以设置代理,网站它会检测某一段时间某个IP 的访问次数，如果访问次数过多，它会禁止你的访问,所以这个时候需要通过设置代理来爬取数据。**

import urllib.request
    
    proxy_handler = urllib.request.ProxyHandler({
        'http': 'http://127.0.0.1:9743',
        'https': 'https://127.0.0.1:9743'
    })
    opener = urllib.request.build_opener(proxy_handler)
    response = opener.open('http://httpbin.org/get')
    print(response.read())

### 3.5**cookie,HTTPCookiProcessor的使用** ###

**3.51获取与保存cookie**

cookie中保存中我们常见的登录信息，有时候爬取网站需要携带cookie信息访问,这里用到了http.cookijar，用于获取cookie以及存储cookie数据。

import http.cookiejar, urllib.request
    cookie = http.cookiejar.CookieJar()
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)
    response = opener.open('http://www.baidu.com')
    for item in cookie:
        print(item.name+"="+item.value)
    
    '''测试结果如下：
    BAIDUID=9B2F476BF55C3D00E14C6487B27DCAF9:FG=1
    BIDUPSID=9B2F476BF55C3D00E14C6487B27DCAF9
    H_PS_PSSID=1443_21098_28132_26350_27750_28140_22159
    PSTM=1545493654
    delPer=0
    BDSVRTM=0
    BD_HOME=0
    '''

同时cookie可以写入到文本文件中保存，有两种方式http.cookiejar.MozillaCookieJar和http.cookiejar.LWPCookieJar()，当然你自己用哪种方式都可以。比如：http.cookiejar.MozillaCookieJar()方式和http.cookiejar.LWPCookieJar()方式分别演示将cookie保存为文本文件cookie.txt:

1.使用http.cookiejar.MozillaCookieJar()方式
    import http.cookiejar, urllib.request
    filename = "cookie.txt"
    cookie = http.cookiejar.MozillaCookieJar(filename)
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)
    response = opener.open('http://www.baidu.com')
    cookie.save(ignore_discard=True, ignore_expires=True)
    
    2.http.cookiejar.LWPCookieJar()方式
    import http.cookiejar, urllib.request
    filename = 'cookie.txt'
    cookie = http.cookiejar.LWPCookieJar(filename)
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)
    response = opener.open('http://www.baidu.com')
    cookie.save(ignore_discard=True, ignore_expires=True)

**3.52加载使用已经存在的cookie文件**

import http.cookiejar, urllib.request
    cookie = http.cookiejar.LWPCookieJar()
    cookie.load('cookie.txt', ignore_discard=True, ignore_expires=True)
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)
    response = opener.open('http://www.baidu.com')
    print(response.read().decode('utf-8'))

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[urllib]: https://docs.python.org/3/library/urllib.html