正则表达式

正则表达式常用在我们的生活中,例如检测邮箱是否合法,手机号,身份证是否正确等

re模块

在python中内置了专门处理正则表达式的re模块,有了re模块就可以在程序中使用正则表达式及其相关函数

match函数

格式
match(pattern,string)

pattern表示正则表达式,string表示待匹配的字符串

功能
对待匹配的字符串按从左到右的顺序,使用正则表达式进行匹配。如果从左侧开始有一个子串能够与其匹配,则不会继续向后匹配。随后返回结果

例如
匹配一个字符串中是否有“python”字符串

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import re
str = "python java python c++"
rs= re.match("python",str)
print(rs)

输出结果:
<_sre.SRE_Match object;span=(0,6),match='python'>

获取正则表达式匹配成功的子串

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import re
str = "python java python c++"
rs= re.match("python",str)
print(rs.group())

输出结果:
python

单字符匹配

单字符匹配就是正则当中基础部分,下表列举了常用的正则单字符匹配符号

符号 描述
. 匹配除”\n”之外的任意单个字符
\d 匹配0到9之间的一个数字,等价于[0-9]
\s 匹配任意空白字符,如空格,制表符”\t”,换行”\n”等
\w 匹配单词字符,包括字母,数字,下划线
\D 匹配一个非数字字符,等价于[^0-9]
\S 匹配任意非空白字符
\W 匹配非单词字符
[] 匹配[]中列举的字符

例如
使用点号.匹配除换行符”\n”之外的任意一个单字符

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rs=re.match(".","1")#匹配一个包括数字的字符串
print(rs.group())
rs=re.match(".","a")#匹配一个包括单字符的字符串
print(rs.group())
rs=re.match(".","abc")#匹配一个包括多字符的字符串
print(rs.group())

输出结果:
1
a
a

使用多个点好匹配多个单字符

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rs=re.match("...","abc")#匹配多字符的字符串
print(rs.group())
rs=re.match(".","\n")#不会匹配返回None
print(rs.group())

输出结果:
abc
None

但是单单只是匹配单个字符,在日常生活中的应用还是很少的,所以常用的还有\w,\d等,方法与点号类似 不在多介绍

数量表示

虽然在匹配多个字符的时候可以使用...这样的方式来匹配,但是较为麻烦,所以正则中还有表示数量的符号,下表是常用的数量表示符号

符号 描述
* 匹配一个字符出现0次或多次
+ 匹配一个字符至少出现一次,等价于{1,}
? 匹配一个字符至多出现一次,也就是出现0次或1次,等价于{0,1}
{m} 匹配一个字符出现m次
{m,} 匹配一个字符至少出现m次
{m,n} 匹配一个字符出现m到n次

例如:
检查用户信息是否完整

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user_infos=["Tom,13812345678,20","David,,30","Lilei,18851888888,25"]
for user in user_infos:
rs=re.match("\w+,[0-9]{11},\d+",user)
if rs!=None:
print("用户信息:{}"。format(rs.group()))
else:
print("用户信息不完整")

输出结果:
用户信息:Tom,13812345678,20
用户信息不完整
用户信息:Lilei,18851888888,25

验证手机号是否合法

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#合法手机的规则是11位组成,第一位是1,第二位是[3,5,7,8]其中一个,第三位到最后都是数字
def reg_phone(phone):
rs=re.match("1[3578]\d{9}",phone)
if rs==None:
return False
else:
print(rs.group())
return True

输入:13612345678
输出 True

边界表示

在正则中还可以使用边界规则限制待匹配的字符串开始或结束的边界

符号 描述
^ 匹配字符串开头
$ 匹配字符串结尾

例如:
验证标识符是否合法

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def reg_identifier(str):
rs=re.match("^[0-9]\w*",str)
if rs!=None:
return False
else:
return True

print("标识符1_name是否合法:{}".format(reg_identifier("1_name")))
print("标识符name_1是否合法:{}".format(reg_identifier("name_1")))

输出结果:
标识符1_name是否合法:False
标识符name_1是否合法:True

在这个例子中,正则表达式的意思是凡是以数字开头,出现0次或多次的标识符都是非法的

转义字符

转义字符在很多编程语言中都存在,一般常见的是\
专业字符的作用就是,转移一些特殊的符号或者字母

例如:
我想打印这样一个字符串hello\world

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str="hello\world"
print(str)

这个字符串如果用在正则当中,就会因为w是特殊字母,加了\后,会被正则解释为\w,也就是匹配字母,导致错误。
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str="hello\\world"
print(str)

输出结果:
hello\world

在特殊符号前加上\将其转义,就能正常输出啦

当然,为了防止漏写或错写还可以采用在字符串前加上r,意思就是输出原生字符串

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str=r"hello\world"
print(str)

输出结果:
hello\world

在r控制的字符串中,所有特殊字符都会被当成普通字符来输出

匹配分组

这个方法最常用在邮箱匹配中,常规的正则只能匹配一种类型的邮箱,想要匹配多种类型的邮箱,就可以采用分组来实现

符号 描述
竖线 连接多个表达式,表达式之间是“或”的关系
() 将括号中字符作为一个分组
\NUM 结合()分组使用,引用分组NUM对应的匹配规则
(?P< name>) 给分组起名
(?P=name) 根据组名使用分组中的正则表达式

例如:
匹配163,QQ,Outlook的邮箱

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rs1=re.match(r"\w{4,10}@(163|qq|outlook)\.com$","python2018@163.com")
print(rs1)
rs2=re.match(r"\w{4,10}@(163|qq|outlook)\.com$","12345@qq.com")
print(rs2)

输出结果:
<_sre.SRE_Match object;span=(0,18),match='python2018@163.com'>
<_sre.SRE_Match object;span=(0,12),match='12345@qq.com'>

匹配网页标签:

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html_data="<head><title>python</titile></head>"
rs=re.match(r"<.+><.+>.+</.+></.+>",html_data)
print(rs)

给分组取别名:

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html_data="<head><titile>python</titile></head>"
rs=re.match(r"<(?P<g1>.+)><(?P<g2>.+)>.+</(?P=g2)></(?P=g1)>",html_data)
print(rs)

输出结果:
<re.Match object; span=(0, 36), match='<head><titile>python</titile></head>'>

内置函数

为了方便开发者编写正则表达式,为其提供了很多操作正则表达式的内置函数

compile函数

这个函数类似于面向对象里面的复用技术

例如:

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pattern=re.compile("\w{4,10}@163\.com$")
rs=re.match(pattern,"python2018@163.com")
print(rs)
rs=re.match(pattern,"vip_python@163.com")
print(rs)

输出结果:
<re.Match object; span=(0, 18), match='python2018@163.com'>
<re.Match object; span=(0, 18), match='vip_python@163.com'>

使用该函数可以让代码更简洁

search函数

这个函数是从左到右在字符串的任意位置搜索第一个被正则匹配的子字符串

例如:

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rs=re.search("python","hi python,i am going to study python")
print(rs)

输出结果:
<re.Match object; span=(3, 9), match='python'>

可以看出第一个python在3,9之间,第二个python没有被匹配,说明search只能匹配一次,没有向后继续匹配

findall函数

findall函数是在字符串中查找正则表达式匹配成功的所有子字符串
例如:
从用户信息中查找出所有手机号

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infos="Tom:13800000001,David:13800000002"
list=re.findall(r"1[3578]\d{9}",infos)
print(list)

输出结果为:
['13800000001', '13800000002']

该函数的作用其实更像是search函数的升级版,它可以匹配出所有满足正则表达式的子字符串

finditer函数

查找正则表达式匹配成功的所有子字符串,返回结果是一个可迭代的对象Iterator

例如:
从用户信息中查找出所有手机号

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infos="Tom:13800000001,David:13800000002"
iter_obj=re.finditer(r"1[3578]\d{9}",infos)
for iter in iter_obj:
print(iter.group())

输出结果为:
13800000001
13800000002

这个函数更加方便,因为有迭代器的加入,使查看信息更加方便有效

sub函数

这个函数其实就是一个替换函数,将匹配到的字符串换成另一个字符串
例如:
将空格都换成逗号

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stu="Tom 13800000001 Male"
stu_new = re.sub("\s",",",stu)
print("stu={}".format(stu))
print("stu_new={}".format(stu_new))

输出结果:
stu=Tom 13800000001 Male
stu_new=Tom,13800000001,Male

贪婪与非贪婪模式

python中正则匹配默认是启用贪婪模式,也就是尽可能多的去匹配字符

非贪婪模式就是尽可能地少匹配字符
想要启动非贪婪模式只需要在“*,?,+,{m,n}”的后面加上一个?

例如:

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rs=re.findall("python\d*?","python2018")
print(rs)

输出结果:
['python']

Web编程

Web编程又叫网络编程,是python中比较擅长的领域,内置了许多与网络编程有关的库,且第三方库十分丰富

网络编程基础

当今程序员在进行网络编程时,要按照C/S模式来开发,为了实现客户端和服务端在网络中正常运行,还要遵守HTTP网络传输协议

1.HTTP
即超文本传输协议的缩写,浏览器通过”http: //www”的方式访问的就是HTTP协议

2.URL
即统一资源定位符的缩写,也就是我们常熟的网址

3.HTTP请求,常见的有GET和POST请求

4.状态码
就是客户端请求HTTP之后,服务端返回给客户端的响应内容
200:表示请求成功
404:表示资源不存在
500:表示服务器错误

urllib库

urllib库是python内置的HTTP请求库,下表是urllib库内置的模块

符号 描述
urllib.request HTTP请求模块,在程序中模拟浏览器发送的HTTP请求
urllib.error 异常处理模块,捕获由于HTTP请求问题产生的异常,并进行处理
urllib.parse URL解析模块,提供了处理URL的工具函数
urllib.robotparser robots.txt解析模块,网站通过robots.txt文件设置爬虫可爬取的网页

urllib.request.urlopen函数

urllib库中的reaquest模块内置的urlopen函数用于向目标URL地址发送请求,返回一个HTTPRespoense类型对象,通过该对象获取响应内容:
url:目标URL访问地址

data:默认是None,表示以GET方式发送请求,如果改为以POST方式发送请求,需要传入data参数值

timeout:访问超时时间,有时由于网络问题或者目标站点服务器处理请求时间较长,可能会产生超时异常,可以通过设置timeout参数延长超时时间

发送GET请求

以GET方式访问百度首页

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import urllib.request

response=urllib.request.urlopen("http://www.baidu.com")
print(response.read().decode("utf8"))

结果就是返回该首页的源码
C:\Python38\python3.exe D:/TIM_DOWLOAD/233.py
<!DOCTYPE html><!--STATUS OK--><html><head><meta http-equiv="Content-Type" content="text/html;charset=utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta content="always" name="referrer"><meta name="theme-color" content="#2932e1"><link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" /><link rel="search" type="application/opensearchdescription+xml" href="/content-search.xml" title="百度搜索" /><link rel="icon" sizes="any" mask href="//www.baidu.com/img/baidu_85beaf5496f291521eb75ba38eacbd87.svg"><link rel="dns-prefetch" href="//dss0.bdstatic.com"/><link rel="dns-prefetch" href="//dss1.bdstatic.com"/><link rel="dns-prefetch" href="//ss1.bdstatic.com"/><link rel="dns-prefetch" href="//sp0.baidu.com"/><link rel="dns-prefetch" href="//sp1.baidu.com"/><link rel="dns-prefetch" href="//sp2.baidu.com"/><title>百度一下,你就知道</title><style type="text/css" id="css_index" index="index">body,html{height:100%}html{overflow-y:auto}body{font:12px arial;background:#fff}body,form,li,p,ul{margin:0;padding:0;list-style:none}#fm,body,form{position:relative}td{text-align:left}img{border:0}a{text-decoration:none}a:active{color:#f60}input{border:0;padding:0}.clearfix:after{content:'\20';display:block;height:0;clear:both}.clearfix{zoom:1}#wrapper{position:relative;min-height:100%}#head{padding-bottom:100px;text-align:center;*z-index:1}#ftCon{height:50px;position:absolute;text-align:left;width:100%;margin:0 auto;z-index:0;overflow:hidden}#ftConw{display:inline-block;text-align:left;margin-left:33px;line-height:22px;position:relative;top:-2px;*float:right;*margin-left:0;*position:static}#ftConw,#ftConw a{color:#999}#ftConw{text-align:center;margin-left:0}.bg{background-image:url(http://ss.bdimg.com/static/superman/img/icons-5859e577e2.png);background-repeat:no-repeat;_background-image:url(http://ss.bdimg.com/static/superman/img/icons-d5b04cc545.gif)}.c-icon{display:inline-block;width:14px;height:14px;vertical-align:text-bottom;font-style:normal;overflow:hidden;background:url(http://ss.bdimg.com/static/superman/img/icons-5859e577e2.png) no-repeat 0 0;_background-image:url(http://ss.bdimg.com/static/superman/img/icons-d5b04cc545.gif)}.c-icon-triangle-down-blue{background-position:-480px -168px}.c-icon-chevron-unfold2{background-position:-504px -168px}#m{width:720px;margin:0 auto}#lk,#nv a,#nv b,.btn{font-size:14px}#nv{height:19px;font-size:16px;margin:0 0 4px;text-align:left;text-indent:137px}#jgwab{margin-left:19px}#cp .c-icon-icrlogo,.c-icon-jgwablogo{width:14px;height:17px;display:inline-block;overflow:hidden;background:url(http://ss.bdimg.com/static/superman/img/icons-5859e577e2.png) no-repeat;_background-image:url(http://ss.bdimg.com/static/superman/img/icons-d5b04cc545.gif)}#cp .c-icon-icrlogo{background-position:-600px -96px;position:relative;top:3px}.c-icon-jgwablogo{background-position:-623px -96px;position:relative;top:3px}#shouji{margin-right:14px}#u{display:none}#c-tips-container{display:none}#wrapper{min-width:1250px;height:100%;min-height:600px}#head{position:relative;padding-bottom:0;height:100%;min-height:600px}#head #lg .index-logo-src,#head #lg .index-logo-srcnew{position:absolute;bottom:10px;left:50%;margin-left:-135px}#m{position:relative}#fm{padding-left:40px;top:-37px}#lh a{margin-left:62px}#lh #setf,#lh #seth{margin-left:0}#lk{position:absolute;display:none;top:0;right:0;margin:33px 0}#lk span{font:14px "宋体"}#nv{position:absolute;display:none;top:0;right:0}#lm{color:#666;width:100%;height:60px;margin-top:60px;line-height:15px;font-size:13px;position:absolute;top:0;left:0}#lm a{color:#666}#pad-version{line-height:40px}#su.bg,.s_btn_wr.bg,.s_ipt_wr.bg{background-image:none}#result_logo{display:none}#index_logo img{display:inline-block;width:270px;height:129px}#s_tab{display:none}.s_form_wrapper{height:100%}.s_form_wrapper.lite{top:-191px}#head .c-icon-bear-round{display:none}#fm .bdsug,#form .bdsug{top:35px;z-index:100}.bdsug{display:none;position:absolute;width:538px;background:#fff;border:1px solid #ccc;_overflow:hidden;box-shadow:1px 1px 3px #ededed;-webkit-box-shadow:1px 1px 3px #ededed;-moz-box-shadow:1px 1px 3px #ededed;-o-box-shadow:1px 1px 3px #ededed}.bdsug.bdsugbg ul{background:url(http://ss.bdimg.com/static/superman/img/sugbg-1762fe7cb1.png) 100% 100% no-repeat;background-size:100px 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0;color:#999;display:block}\n.c-tip-con .c-tip-timerfilter-ft li a,.c-tip-con .c-tip-timerfilter-ft li span{text-indent:20px}\n.c-tip-custom{padding:0 15px 10px;position:relative;zoom:1}\n.c-tip-custom hr{border:0;height:0;border-top:1px solid #ebebeb}\n.c-tip-custom p{color:#b6b6b6;height:25px;line-height:25px;margin:2px 0}\n.c-tip-custom .c-tip-custom-et{margin-bottom:7px}\n.c-tip-custom-input,.c-tip-si-input{display:inline-block;font-size:11px;color:#333;margin-left:4px;padding:0 2px;width:74%;height:16px;line-height:16px\\9;border:1px solid #ebebeb;outline:0;box-sizing:content-box;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;overflow:hidden;position:relative}\n.c-tip-custom-input-init{color:#d4d4d4}\n.c-tip-custom-input-focus,.c-tip-si-input-focus{border:1px solid #3385ff}\n.c-tip-timerfilter-si .c-tip-si-input{width:138px;height:22px;line-height:22px;vertical-align:0;*vertical-align:-6px;_vertical-align:-5px;padding:0 5px;margin-left:0}\n.c-tip-con .c-tip-timerfilter 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a{color:#333;text-decoration:none;-webkit-tap-highlight-color:rgba(23,23,23,.1)}\n[data-pmd] .c-icon{display:inline;width:auto;height:auto;vertical-align:baseline;overflow:auto}\n[data-pmd] .c-row-tile{position:relative;margin:0 -9px}\n[data-pmd] .c-row-tile .c-row{padding:0 9px}\n[data-pmd] .c-row :last-child,[data-pmd] .c-row-tile :last-child{margin-right:0}\n[data-pmd] .c-row *,[data-pmd] .c-row-tile *{-webkit-box-sizing:border-box;box-sizing:border-box}\n[data-pmd] .c-icon{font-family:cicons!important;font-style:normal;-webkit-font-smoothing:antialiased}\n[data-pmd] .c-result{padding:0;margin:0;background:0;border:0 none}\n[data-pmd] .c-blocka{display:block}\n[data-pmd] a .c-title,[data-pmd] a.c-title{font:18px\/26px Arial,Helvetica,sans-serif;color:#000}\n[data-pmd] a:visited .c-title,[data-pmd] a:visited.c-title{color:#999}\n[data-pmd] .sfa-view .c-title,[data-pmd] .sfa-view a:visited .c-title,[data-pmd] .sfa-view a:visited.c-title{color:#000;font:18px\/26px Arial,Helvetica,sans-serif}\n[data-pmd] .c-title,[data-pmd] .c-title-noclick{font:18px\/26px Arial,Helvetica,sans-serif;color:#999}\n[data-pmd] .c-title-nowrap{padding-right:33px;width:100%;position:relative;white-space:nowrap;box-sizing:border-box}\n[data-pmd] .c-title-nowrap .c-text{display:inline-block;vertical-align:middle}\n[data-pmd] .c-title-nowrap .c-title-text{display:inline-block;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;vertical-align:bottom}\n[data-pmd] .c-font-sigma{font:22px\/30px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-large{font:18px\/26px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-big{font:18px\/26px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-medium{font:14px\/22px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-normal{font:13px\/21px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-small{font:12px\/20px Arial,Helvetica,sans-serif}\n[data-pmd] .c-font-tiny{font:12px\/20px Arial,Helvetica,sans-serif}\n[data-pmd] .c-price{font:18px\/26px Arial,Helvetica,sans-serif;color:#f60}\n[data-pmd] .c-title-wrap{display:block}\n[data-pmd] .c-title-nowrap{display:none}\n@media (min-width:376px){\n[data-pmd] .c-title{display:block;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;vertical-align:middle}\n[data-pmd] .c-title-nowrap{display:block;overflow:visible}\n[data-pmd] .c-title-wrap{display:none}\n}\n[data-pmd] .c-abstract{color:#555}\n[data-pmd] .c-showurl{color:#999;font:13px\/21px Arial,Helvetica,sans-serif}\n[data-pmd] .c-gray{color:#999;font:13px\/21px Arial,Helvetica,sans-serif}\n[data-pmd] .c-moreinfo{color:#555;text-align:right;font:13px\/21px Arial,Helvetica,sans-serif}\n[data-pmd] .c-foot-icon{display:inline-block;position:relative;top:.02rem;background:url(\/\/m.baidu.com\/static\/search\/sprite.png) no-repeat;-webkit-background-size:1.9rem 1.42rem;background-size:1.9rem 1.42rem}\n[data-pmd] .c-foot-icon-16{width:.16rem;height:.13rem}\n[data-pmd] .c-foot-icon-16-aladdin{display:none;background-position:0 -.98rem}\n[data-pmd] .c-foot-icon-16-lightapp{background-position:-.2rem -.98rem}\n[data-pmd] .c-visited,[data-pmd] .c-visited .c-title,[data-pmd] .c-visited.c-title{color:#999!important}\n[data-pmd] .c-container{margin:8px 0;padding:10px 9px 15px;background-color:#fff;width:auto;color:#555;font:13px\/21px Arial,Helvetica,sans-serif;word-break:break-word;word-wrap:break-word;border:0 none}\n[data-pmd] .c-container-tight{padding:10px 9px 15px;background-color:#fff;width:auto;color:#555;font:13px\/21px Arial,Helvetica,sans-serif;word-break:break-word;word-wrap:break-word;border:0 none}\n[data-pmd] .c-container-tile{margin:0;padding:0}\n[data-pmd] 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#eee}\n[data-pmd] .c-line-dotted-top{border-top:1px dotted #eee}\n[data-pmd] .c-line-bottom{border-bottom:1px solid #eee}\n[data-pmd] .c-line-dotted-bottom{border-bottom:1px dotted #eee}\n[data-pmd] .c-color{color:#555}\n[data-pmd] .c-color-gray-a{color:#666}\n[data-pmd] .c-color-gray{color:#999}\n[data-pmd] .c-color-link{color:#000}\n[data-pmd] .c-color-noclick{color:#999}\n[data-pmd] .c-color-url{color:#999}\n[data-pmd] .c-color-red{color:#e43}\n[data-pmd] .c-color-red:visited{color:#e43}\n[data-pmd] .c-color-orange{color:#f60}\n[data-pmd] .c-color-orange:visited{color:#f60}\n[data-pmd] .c-color-icon-special{color:#b4b4b4}\n[data-pmd] .c-color-split{color:#eee}\n[data-pmd] .c-bg-color-white{background-color:#fff}\n[data-pmd] .c-bg-color-black{background-color:#000}\n[data-pmd] .se-page-bd .c-bg-color-gray{background-color:#f1f1f1}\n[data-pmd] .sfa-view .c-bg-color-gray{background-color:#f2f2f2}\n[data-pmd] .c-gap-top-zero{margin-top:0}\n[data-pmd] .c-gap-right-zero{margin-right:0}\n[data-pmd] .c-gap-bottom-zero{margin-bottom:0}\n[data-pmd] .c-gap-left-zero{margin-left:0}\n[data-pmd] .c-gap-top{margin-top:8px}\n[data-pmd] .c-gap-right{margin-right:8px}\n[data-pmd] .c-gap-bottom{margin-bottom:8px}\n[data-pmd] .c-gap-left{margin-left:8px}\n[data-pmd] .c-gap-top-small{margin-top:4px}\n[data-pmd] .c-gap-right-small{margin-right:4px}\n[data-pmd] .c-gap-bottom-small{margin-bottom:4px}\n[data-pmd] .c-gap-left-small{margin-left:4px}\n[data-pmd] .c-gap-top-large{margin-top:12px}\n[data-pmd] .c-gap-right-large{margin-right:12px}\n[data-pmd] .c-gap-bottom-large{margin-bottom:12px}\n[data-pmd] .c-gap-left-large{margin-left:12px}\n[data-pmd] .c-gap-left-middle{margin-left:8px}\n[data-pmd] .c-gap-right-middle{margin-right:8px}\n[data-pmd] .c-gap-inner-top-zero{padding-top:0}\n[data-pmd] .c-gap-inner-right-zero{padding-right:0}\n[data-pmd] .c-gap-inner-bottom-zero{padding-bottom:0}\n[data-pmd] .c-gap-inner-left-zero{padding-left:0}\n[data-pmd] .c-gap-inner-top{padding-top:8px}\n[data-pmd] .c-gap-inner-right{padding-right:8px}\n[data-pmd] .c-gap-inner-bottom{padding-bottom:8px}\n[data-pmd] .c-gap-inner-left{padding-left:8px}\n[data-pmd] .c-gap-inner-top-small{padding-top:4px}\n[data-pmd] .c-gap-inner-right-small{padding-right:4px}\n[data-pmd] .c-gap-inner-bottom-small{padding-bottom:4px}\n[data-pmd] .c-gap-inner-left-small{padding-left:4px}\n[data-pmd] .c-gap-inner-top-large{padding-top:12px}\n[data-pmd] .c-gap-inner-right-large{padding-right:12px}\n[data-pmd] .c-gap-inner-bottom-large{padding-bottom:12px}\n[data-pmd] .c-gap-inner-left-large{padding-left:12px}\n[data-pmd] .c-gap-inner-left-middle{padding-left:8px}\n[data-pmd] .c-gap-inner-right-middle{padding-right:8px}\n[data-pmd] .c-img{position:relative;display:block;width:100%;border:0 none;background:#f7f7f7 url(\/\/m.baidu.com\/static\/search\/image_default.png) center center no-repeat;margin:4px 0}\n[data-pmd] .c-img img{width:100%}\n[data-pmd] .c-img .c-img-text{position:absolute;left:0;bottom:0;width:100%;height:.16rem;background:rgba(51,51,51,.4);font-size:.12rem;line-height:1.33333333;color:#fff;text-align:center}\n[data-pmd] .c-img-l,[data-pmd] .c-img-s,[data-pmd] .c-img-v,[data-pmd] .c-img-w,[data-pmd] .c-img-x,[data-pmd] .c-img-y,[data-pmd] .c-img-z{height:0;overflow:hidden}\n[data-pmd] .c-img-s{padding-bottom:100%}\n[data-pmd] .c-img-l{padding-bottom:133.33333333%}\n[data-pmd] .c-img-w{padding-bottom:56.25%}\n[data-pmd] .c-img-x{padding-bottom:75%}\n[data-pmd] .c-img-y{padding-bottom:66.66666667%}\n[data-pmd] .c-img-v{padding-bottom:33.33333333%}\n[data-pmd] .c-img-z{padding-bottom:40%}\n[data-pmd] .c-table{width:100%;border-collapse:collapse;border-spacing:0;color:#000}\n[data-pmd] .c-table th{color:#999}\n[data-pmd] .c-table td,[data-pmd] .c-table th{border-bottom:1px solid #eee;text-align:left;font-weight:400;padding:8px 0}\n[data-pmd] .c-table-hihead th{padding:0;border-bottom:0 none;background-color:#f6f6f6;line-height:.37rem}\n[data-pmd] .c-table-hihead div{background-color:#f6f6f6}\n[data-pmd] .c-table-hihead th:first-child div{margin-left:-9px;padding-left:9px}\n[data-pmd] .c-table-hihead th:last-child div{margin-right:-9px;padding-right:9px}\n[data-pmd] .c-table-noborder td,[data-pmd] .c-table-noborder th{border-bottom:0 none}\n[data-pmd] .c-table-slink tbody{color:#555;border-bottom:1px solid #eee}\n[data-pmd] .c-table-slink tbody th{border-bottom:1px solid #eee;padding:0}\n[data-pmd] .c-table-slink tbody td{border-bottom:0;padding:0}\n[data-pmd] .c-table-slink tbody td .c-slink-auto{margin:5px 0}\n[data-pmd] .c-table-slink tbody tr:first-child td,[data-pmd] .c-table-slink tbody tr:first-child th{padding:8px 0}\n[data-pmd] .c-table-slink tbody tr:nth-child(2) td,[data-pmd] .c-table-slink tbody tr:nth-child(2) th{padding-top:8px}\n[data-pmd] .c-table-slink tbody tr td,[data-pmd] .c-table-slink tbody tr th{padding-bottom:4px}\n[data-pmd] .c-table-slink tbody tr:last-child td,[data-pmd] .c-table-slink tbody tr:last-child th{padding-bottom:8px}\n[data-pmd] .c-table-abstract tbody{color:#555;border-bottom:1px solid #eee}\n[data-pmd] .c-table-abstract tbody th{border-bottom:1px solid #eee;padding:0}\n[data-pmd] .c-table-abstract tbody td{border-bottom:0;padding:0}\n[data-pmd] .c-table-abstract tbody tr:first-child td,[data-pmd] .c-table-abstract tbody tr:first-child th,[data-pmd] .c-table-abstract tbody tr:nth-child(2) td,[data-pmd] .c-table-abstract tbody tr:nth-child(2) th{padding-top:8px}\n[data-pmd] .c-table-abstract tbody tr td,[data-pmd] .c-table-abstract tbody tr th{padding-bottom:8px}\n[data-pmd] .c-table-abstract .c-table-gray{color:#999;font:12px\/20px Arial,Helvetica,sans-serif}\n[data-pmd] .c-table-shaft th{color:#999}\n[data-pmd] .c-table-shaft td,[data-pmd] .c-table-shaft th{border-right:1px solid #eee;text-align:center}\n[data-pmd] .c-table-shaft td:last-child,[data-pmd] .c-table-shaft th:last-child{border-right:0}\n[data-pmd] .c-table-shaft tr:last-child td{border-bottom:0}\n[data-pmd] .c-slink{width:auto;display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-direction:normal;-webkit-box-pack:justify;-webkit-box-align:stretch;-webkit-box-lines:single;display:-webkit-flex;-webkit-flex-direction:row;-webkit-justify-content:space-between;-webkit-align-items:stretch;-webkit-align-content:flex-start;-webkit-flex-wrap:nowrap}\n[data-pmd] .c-slink .c-slink-elem,[data-pmd] .c-slink a{position:relative;display:block;-webkit-box-flex:1;-webkit-flex:1 1 auto;width:16.66666667%;height:.32rem;line-height:2.28571429;padding:0 .06rem;font-size:.14rem;text-align:center;text-decoration:none;color:#666;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}\n[data-pmd] .c-slink .c-slink-elem::after,[data-pmd] .c-slink .c-slink-elem:first-child::before,[data-pmd] .c-slink a::after,[data-pmd] .c-slink a:first-child::before{content:\"\";width:1px;height:.1rem;background-color:#eee;position:absolute;top:.11rem;right:0}\n[data-pmd] .c-slink .c-slink-elem:first-child::before,[data-pmd] .c-slink a:first-child::before{left:0}\n[data-pmd] .c-slink-strong{margin-bottom:1px}\n[data-pmd] .c-slink-strong:last-child{margin-bottom:0}\n[data-pmd] .c-slink-strong:last-child .c-slink-elem,[data-pmd] .c-slink-strong:last-child a{border-bottom:1px solid #eee}\n[data-pmd] .c-slink-strong .c-slink-elem,[data-pmd] .c-slink-strong a{height:.3rem;margin-right:1px;line-height:.3rem;background-color:#f5f5f5}\n[data-pmd] .c-slink-strong .c-slink-elem:last-child,[data-pmd] .c-slink-strong a:last-child{margin-right:0}\n[data-pmd] .c-slink-strong .c-slink-elem::after,[data-pmd] .c-slink-strong .c-slink-elem:first-child::before,[data-pmd] .c-slink-strong a::after,[data-pmd] .c-slink-strong a:first-child::before{display:none}\n[data-pmd] .c-slink-new{display:block;width:100%;height:.3rem;line-height:.3rem;background-color:#f5f5f5;font-size:.14rem;color:#000;text-align:center;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 .08rem;border-radius:.03rem;vertical-align:middle;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0)}\n[data-pmd] .c-slink-new:visited{color:#000}\n[data-pmd] .c-slink-new:active{background-color:#e5e5e5}\n[data-pmd] .c-slink-new-strong{display:block;width:100%;background-color:#f5f5f5;font-size:.14rem;color:#000;text-align:center;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 .08rem;border-radius:.03rem;vertical-align:middle;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0);height:.3rem;line-height:.3rem}\n[data-pmd] .c-slink-new-strong:visited{color:#000}\n[data-pmd] .c-slink-new-strong:active{background-color:#e5e5e5}\n[data-pmd] .c-slink-auto{display:inline-block;max-width:100%;height:.3rem;line-height:.3rem;background-color:#f5f5f5;font-size:.14rem;color:#000;text-align:center;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 .1rem;border-radius:3px;vertical-align:middle;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0)}\n[data-pmd] .c-slink-auto:active{background-color:#e5e5e5}\n[data-pmd] .c-slink-auto:visited{color:#000}\n[data-pmd] .c-text{display:inline-block;height:14px;padding:0 2px;margin-bottom:2px;text-decoration:none;vertical-align:middle;color:#fff;font-size:10px;line-height:15px;font-style:normal;font-weight:400;overflow:hidden;border-radius:2px}\n[data-pmd] .c-text-danger{background-color:#f13f40}\n[data-pmd] .c-text-public{background-color:#2b99ff}\n[data-pmd] .c-text-box{display:inline-block;padding:1px 2px;margin-bottom:2px;text-decoration:none;vertical-align:middle;font-size:10px;line-height:11px;height:10px;font-style:normal;font-weight:400;overflow:hidden;-webkit-box-sizing:content-box;box-sizing:content-box;border-radius:2px}\n[data-pmd] .c-text-box-gray{color:#999;border:1px solid #e3e3e3}\n[data-pmd] .c-text-box-orange{color:#f60;border:1px solid #f3d9c5}\n[data-pmd] .c-text-box-pink{color:#ff4683;border:1px solid #ffc7da}\n[data-pmd] .c-text-box-red{color:#f13f40;border:1px solid #efb9b9}\n[data-pmd] .c-text-box-blue{color:#2b99ff;border:1px solid #b3d4f3}\n[data-pmd] .c-text-box-green{color:#65b12c;border:1px solid #d7efc6}\n[data-pmd] .c-text-box-yellow{color:#faa90e;border:1px solid #feecc9}\n[data-pmd] .c-text-info{display:inline;color:#999;font-style:normal;font-weight:400;font-family:sans-serif}\n[data-pmd] .c-index{display:inline-block;height:15px;margin:0 5px 3px 0;text-align:center;vertical-align:middle;color:#999;font-size:14px;line-height:15px;overflow:hidden}\n[data-pmd] .c-index-hot-common{font-size:12px;color:#fff;width:16px}\n[data-pmd] .c-index-hot,[data-pmd] .c-index-hot1{background-color:#ff2d46;font-size:12px;color:#fff;width:16px}\n[data-pmd] .c-index-hot2{background-color:#ff7f49;font-size:12px;color:#fff;width:16px}\n[data-pmd] .c-index-hot3{background-color:#ffaa3b;font-size:12px;color:#fff;width:16px}\n[data-pmd] .c-btn{display:inline-block;padding:0 .08rem;width:100%;height:.3rem;font:13px\/21px Arial,Helvetica,sans-serif;line-height:.28rem;text-decoration:none;text-align:center;color:#000;background-color:#fff;border:1px solid #707379;border-radius:3px;vertical-align:middle;overflow:hidden;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0)}\n[data-pmd] .c-btn:visited{color:#000}\n[data-pmd] .c-btn:active{border-color:#707379;background-color:#f2f2f2}\n[data-pmd] .c-btn .c-icon{position:relative;top:-1px;vertical-align:middle;font-size:14px;margin-right:4px}\n[data-pmd] .c-btn-small{display:inline-block;padding:0 .08rem;width:100%;height:.3rem;line-height:.28rem;font-size:12px;font-weight:400;text-decoration:none;text-align:center;color:#000;background-color:#fff;border:1px solid #707379;border-radius:3px;vertical-align:middle;overflow:hidden;outline:0;-webkit-tap-highlight-color:rgba(0,0,0,0)}\n[data-pmd] .c-btn-small:visited{color:#000}\n[data-pmd] .c-btn-small:active{border-color:#707379;background-color:#f2f2f2}\n[data-pmd] .c-btn-small .c-icon{position:relative;top:-1px;vertical-align:middle;font-size:14px;margin-right:4px}\n@media screen and (max-width:360px){\n[data-pmd] .c-btn{padding:0 .05rem}\n}\n@media screen and (max-width:375px){\n[data-pmd] .c-btn-small{padding:0 .02rem}\n}\n[data-pmd] .c-btn-primary{background-color:#f8f8f8;border-color:#d0d0d0;border-bottom-color:#b2b2b2;-webkit-box-shadow:0 1px 1px 0 #e1e1e1;box-shadow:0 1px 1px 0 #e1e1e1}\n[data-pmd] .c-btn-primary .c-icon{color:#02aaf8}\n[data-pmd] .c-btn-disable{color:#999;background-color:#fff;border-color:#f1f1f1}\n[data-pmd] .c-btn-disable:visited{color:#999}\n[data-pmd] .c-btn-disable:active{border-color:#f1f1f1}\n[data-pmd] .c-btn-disable .c-icon{color:#999}\n[data-pmd] .c-btn-weak{height:.3rem;line-height:.3rem;border-width:0}\n[data-pmd] .c-btn-weak:active{background-color:#f2f2f2}\n[data-pmd] .c-btn-weak-auto{width:auto;height:.3rem;line-height:.3rem;border-width:0}\n[data-pmd] .c-btn-weak-auto:active{background-color:#f2f2f2}\n[data-pmd] .c-btn-weak-gray{height:.3rem;line-height:.3rem;background-color:#f8f8f8;border-width:0}\n[data-pmd] .c-btn-weak-gray:active{background-color:#e5e5e5}\n[data-pmd] .c-btn-pills{height:.2rem;padding:0 .08rem;border-width:0;border-radius:.2rem;line-height:.2rem;font-size:10px;background-color:rgba(0,0,0,.4);color:#fff;width:auto;word-spacing:-3px;letter-spacing:0}\n[data-pmd] .c-btn-pills span{position:relative;top:1px}\n[data-pmd] .c-btn-pills::selection{color:#fff}\n[data-pmd] .c-btn-pills:visited{color:#fff}\n[data-pmd] .c-btn-pills:active{background-color:rgba(0,0,0,.4);color:#fff}\n[data-pmd] .c-btn-pills .c-icon{font-size:10px;top:1px;margin-right:4px}\n[data-pmd] .c-btn-circle{height:.3rem;width:.3rem;border-radius:50%;color:#fff;background-color:rgba(0,0,0,.4);border:0;padding:0;line-height:.3rem;text-align:center;vertical-align:middle;white-space:nowrap}\n[data-pmd] .c-btn-circle:active{color:#fff;background-color:rgba(0,0,0,.4)}\n[data-pmd] .c-btn-circle .c-icon{top:0;margin:0;display:block;font-size:14px;color:#fff}\n[data-pmd] .c-btn-circle-big{height:.3rem;width:.3rem;border-radius:50%;background-color:rgba(0,0,0,.4);border:0;padding:0;line-height:.3rem;text-align:center;vertical-align:middle;white-space:nowrap;height:.48rem;width:.48rem;line-height:.48rem;font-size:18px;color:#fff}\n[data-pmd] .c-btn-circle-big:active{color:#fff;background-color:rgba(0,0,0,.4)}\n[data-pmd] .c-btn-circle-big .c-icon{top:0;margin:0;display:block;font-size:14px;color:#fff}\n[data-pmd] .c-btn-circle-big .c-icon{font-size:24px}\n[data-pmd] .c-input{word-break:normal;word-wrap:normal;-webkit-appearance:none;appearance:none;display:inline-block;padding:0 .08rem;width:100%;height:.3rem;vertical-align:middle;line-height:normal;font-size:.14rem;color:#000;background-color:#fff;border:1px solid #eee;border-radius:1px;overflow:hidden;outline:0}\n[data-pmd] .c-input::-webkit-input-placeholder{color:#999;border-color:#eee}\n[data-pmd] .c-input:focus{border-color:#000}\n[data-pmd] .c-input:focus .c-icon{color:#dbdbdb}\n[data-pmd] .c-input:disabled{color:#999;border-color:#f1f1f1}\n[data-pmd] .c-dropdown{position:relative;background-color:#fff}\n[data-pmd] .c-dropdown::before{font-family:cicons;content:\"\\e73c\";display:inline-block;position:absolute;bottom:0;right:.08rem;color:#555;font-size:.14rem;height:.3rem;line-height:.3rem}\n[data-pmd] .c-dropdown>label{display:block;color:#999;background-color:#fff;width:100%;height:.26rem}\n[data-pmd] .c-dropdown>select{word-break:normal;word-wrap:normal;position:relative;-webkit-appearance:none;appearance:none;display:inline-block;padding:0 .24rem 0 .08rem;width:100%;height:.3rem;vertical-align:middle;line-height:normal;font-size:.14rem;color:#000;background-color:transparent;border:1px solid #eee;border-radius:0;overflow:hidden;outline:0}\n[data-pmd] .c-dropdown>select:focus{border-color:#000}\n[data-pmd] .c-dropdown-disable{background-color:#fff}\n[data-pmd] .c-dropdown-disable::before{color:#999}\n[data-pmd] .c-dropdown-disable>label{color:#999}\n[data-pmd] .c-dropdown-disable>select{color:#999;border-color:#f1f1f1}\n[data-pmd] .c-btn-shaft{border:1px solid #f1f1f1;text-overflow:ellipsis;white-space:nowrap}\n[data-pmd] .c-btn-shaft:active{border-color:#f1f1f1}\n[data-pmd] .c-tab-select{background-color:#f5f5f5;height:.38rem;line-height:.38rem;font-size:.14rem;color:#000;text-align:center}\n[data-pmd] .c-tab-select .c-icon{display:inline-block;font-size:.14rem;color:#555}\n[data-pmd] .c-tab-select .c-span12{text-align:left}\n[data-pmd] .c-tab-select .c-span12 .c-icon{position:absolute;right:0;bottom:0}\n@-webkit-keyframes c-loading-rotation{\nfrom{-webkit-transform:rotate(1deg)}\nto{-webkit-transform:rotate(360deg)}\n}\n[data-pmd] .c-loading,[data-pmd] .c-loading-zbios{text-align:center}\n[data-pmd] .c-loading i{display:block;position:relative;font-size:.3rem;width:.54rem;height:.54rem;line-height:.52rem;color:#f3f3f3;margin:auto}\n[data-pmd] .c-loading i::before{content:\"\";display:block;position:absolute;width:.5rem;height:.5rem;margin:auto;border-radius:50%;border:.02rem solid #f3f3f3;border-top-color:#ddd;-webkit-transform-origin:50% 50%;-webkit-animation:c-loading-rotation 1s ease 0s infinite normal}\n[data-pmd] .c-loading-zbios i{display:block;position:relative;font-size:.48rem;width:.54rem;height:.54rem;line-height:.54rem;color:#f3f3f3;margin:auto;-webkit-transform-origin:50% 50%;-webkit-animation:c-loading-rotation .5s linear 0s infinite normal}\n[data-pmd] .c-loading p,[data-pmd] .c-loading-zbios p{color:#999;margin-top:.08rem;text-indent:.5em}\n[data-pmd] .c-tabs{position:relative}\n[data-pmd] .c-tabs-nav{position:relative;min-width:100%;height:.38rem;padding:0 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Process finished with exit code 0

发送POST请求

例如:
“http: //httpbin.org”是一个用于测试各种HTTP请求的网站,以POST方式访问该网站

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#与HTTP请求一起发送的数据
param_dist={"key":"hello"}
#调用urlopen函数将字典类型数据转成字符串
param_str=urllib.parse.urlencode(param_dist)
#将传输的数据封装成一个bytes对象
param_datas=bytes(param_str,encoding='utf8')
#在urlopen函数中传入data参数值,表示将发送一个POST请求
response=urllib.request.urlopen("http://httpbin.org/post",data=param_datas)
#打印网站返回的响应内容
print(response.read())

输出结果:

b'{\n "args": {}, \n "data": "", \n "files": {}, \n "form": {\n "key": "hello"\n }, \n "headers": {\n "Accept-Encoding": "identity", \n "Content-Length": "9", \n "Content-Type": "application/x-www-form-urlencoded", \n "Host": "httpbin.org", \n "User-Agent": "Python-urllib/3.8", \n "X-Amzn-Trace-Id": "Root=1-5e6b3508-41c947dc947274526b62f5e4"\n }, \n "json": null, \n "origin": "112.113.48.105", \n "url": "http://httpbin.org/post"\n}\n'}

超时时间

有时由于网络延迟较高或者服务器处理能力有限等问题,导致客户端向服务器端发送请求时间长就会产生超时,我们可以在程序中通过设置timeout参数避免由于请求超时造成的程序崩溃
例如:

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#设置timeout参数值是0.001
response=urllib.request.urlopen("http://www.baidu.com",timeout=0.001)
print(response.read())

输出结果:
socket.timeout: timed out

这是由于我们设置的时间太短了,服务端都还没有来得及反应

响应状态码和头信息

例如:
获取响应状态码

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response=urllib.request.urlopen("http://www.baidu.com")
print(response.status)

输出结果:
200

获取头信息
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response=urllib.request.urlopen("http://www.baidu.com")
#获取整个响应头信息
print("headers:",response.getheaders())
#获取头信息中的日期
print("header date:",response.getheader("Date"))


输出结果:

headers: [('Bdpagetype', '1'), ('Bdqid', '0xe4ed036300026bd5'), ('Cache-Control', 'private'), ('Content-Type', 'text/html'), ('Cxy_all', 'baidu+c7b4ec4a079ad225d0af1f352eb1ad61'), ('Date', 'Fri, 13 Mar 2020 07:33:02 GMT'), ('Expires', 'Fri, 13 Mar 2020 07:32:56 GMT'), ('P3p', 'CP=" OTI DSP COR IVA OUR IND COM "'), ('P3p', 'CP=" OTI DSP COR IVA OUR IND COM "'), ('Server', 'BWS/1.1'), ('Set-Cookie', 'BAIDUID=ADB580B75B15252E13BC8B232637585E:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'BIDUPSID=ADB580B75B15252E13BC8B232637585E; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'PSTM=1584084782; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'BAIDUID=ADB580B75B15252EB0544AF4A9BEFC98:FG=1; max-age=31536000; expires=Sat, 13-Mar-21 07:33:02 GMT; domain=.baidu.com; path=/; version=1; comment=bd'), ('Set-Cookie', 'delPer=0; path=/; domain=.baidu.com'), ('Set-Cookie', 'BDSVRTM=0; path=/'), ('Set-Cookie', 'BD_HOME=0; path=/'), ('Set-Cookie', 'H_PS_PSSID=30969_1438_31044_21107_30996_30823; path=/; domain=.baidu.com'), ('Traceid', '1584084782022127873016495844733864799189'), ('Vary', 'Accept-Encoding'), ('X-Ua-Compatible', 'IE=Edge,chrome=1'), ('Connection', 'close'), ('Transfer-Encoding', 'chunked')]
header date: Fri, 13 Mar 2020 07:33:02 GMT

Process finished with exit code 0

urllib.request.Request类

使用urlopen函数可以向目标URL地址发送基本的请求,但是参数比较简单,无法完成一些复杂的操作,比如在请求中添加headers头信息等。为了解决更复杂的问题,可以使用内置的Request类构建一个Request对象,给这个对象添加更多的属性

构造方法:

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class Request:
def _init_(self,url,data=None,headers={})
origin_req_host=None,unverifiable=False
method=None):

构造方法中设置了6个参数,下表介绍了各个参数

参数名称 是否必选 描述
url HTTP请求的目标URL地址
data HTTP请求要传输的数据,数据是bytes字节流类型
headers 请求头信息,头信息使用字典存储
origin_req_host 发起HTTP请求的主机名称或者IP地址
unverifiable 表示这个请求是否为无法验证的,默认值是False
method 发起HTTP请求的方式,如GET,POST等

例如:
在Request对象中添加浏览器相关的头信息,将程序伪装成浏览器发送POST请求

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import urllib.parse
url="http://httpbin.org/post"
headers={"User-Agent":"Mozilla/5.0(Macintosh;Intel Mac OS X 10_13_6) AppleWebKit/537.36(KHTML,like Gecko) Chrome/69.0.3497.100 Safari/537.36"}
data_dict={"word":"hello world"}
#将字典类型转换成bytes字节流
data=bytes(urllib.parse.urlencode(data_dict),encoding="utf8")
#创建Request对象
request_obj=urllib.request.Request(url=url,data=data,headers=headers,method="POST")
response=urllib.request.urlopen(request_obj)
print(response.read().decode("utf8"))

输出结果:
{
"args": {},
"data": "",
"files": {},
"form": {
"word": "hello world"
},
"headers": {
"Accept-Encoding": "identity",
"Content-Length": "16",
"Content-Type": "application/x-www-form-urlencoded",
"Host": "httpbin.org",
"User-Agent": "Mozilla/5.0(Macintosh;Intel Mac OS X 10_13_6) AppleWebKit/537.36(KHTML,like Gecko) Chrome/69.0.3497.100 Safari/537.36",
"X-Amzn-Trace-Id": "Root=1-5e6b3af9-53e5f28ea618462a74e2c46e"
},
"json": null,
"origin": "112.113.48.105",
"url": "http://httpbin.org/post"
}

总结

1.正则表达式默认是贪心模式,添加?就可以调整为非贪心模式

2.正则表达式如果想匹配全体数据可以使用,.*?组合使用

3.正则表达式在面对一些复杂的验证时,会比较复杂,可以使用正则表达式的工具来构造正则表达式,或者使用https://c.runoob.com/front-end/854来进行验证

4.urllib模块,在引入时需要import urllib.request才能成功,import urllib会出现错误

5.urllib模块中,read()方法可以读取URL获取的内容

6.response对象是默认的关键字,可以自定义对象来代替

7.引入parse模块,同样需要import urllib.parse,Request类使用更加灵活,且更能体现面向对象编程的理论