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Python爬虫课--第二节 爬虫请求模块 urllib.request，urllib.parse，requests模块

1 urllib.request模块

1.1 版本

python2 ：urllib2、urllib python3 ：把urllib和urllib2合并,urllib.request

1.2 常?的?法

urllib.request.urlopen(地址) 作? ：向车站发起请求并获得响应

import urllib.request # response是响应对象 response = urllib.request.urlopen('https://www.duitang.com/') # read()读取相应对象中的内容 print(response.read()) 结果输出了一系列字节流
  • encode() 字符串–> 转换为bytes数据类型
  • decode() bytes数据类型–> 转换为字符串 字节流 = response.read() 字符串 = response.read().decode(“utf-8”)
import urllib.request # response是响应对象 response = urllib.request.urlopen('https://www.duitang.com/') # read()读取相应对象中的内容 html = response.read().decode('utf-8') print(type(html),html) 结果转化为网页源代码格式 字符串类型

urllib.request.Request"?址",headers=“字典”) 可支持重构User-Agent；urlopen()不持重构User-Agent

  • 对于有反爬的网页
import urllib.request  url = 'https://www.baidu.com/'  headers = { 
             'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400' }  # 1.创建请求对象 req = urllib.request.Request(url,headers=headers) # 2.获取响应对象 response = urllib.request.urlopen(req) # 3.读取响应对象的内容 read().decode('utf-8') html = response.read().decode('utf-8')  print(html) 可以呈现结果
  • 使用流程
  1. 利用Request()方法构建请求对象
  2. 利用urlopen()获取响应对象的方法
  3. 在响应对象中使用read().decode(‘utf-8’) 读取响应对象的内容

1.3 对象h>

read() 读取服务器响应的内容 getcode() 返回HTTP的响应码

import urllib.request

url = 'https://www.baidu.com/'

headers = { 
         
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
}

# 1.创建请求对象
req = urllib.request.Request(url,headers=headers)
# 2.获取响应对象
response = urllib.request.urlopen(req)
# 3.读取响应对象内容 read().decode('utf-8')
html = response.read().decode('utf-8')

# print(html)

print(response.getcode()) #返回状态码结果 200

print(response.geturl()) #返回实际数据的URL地址 https://www.baidu.com/

geturl() 返回实际数据的URL(防⽌重定向问题)

import urllib.request

url = 'https://www.baidu.com/'

headers = { 
         
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
}

# 1.创建请求对象
req = urllib.request.Request(url,headers=headers)
# 2.获取响应对象
response = urllib.request.urlopen(req)
# 3.读取响应对象内容 read().decode('utf-8')
html = response.read().decode('utf-8')

print(response.geturl()) #返回实际数据的URL地址 https://www.baidu.com/

2 urllib.parse模块

2.1 常⽤⽅法

urlencode(字典)，可以实现手动的将汉字变为十六进制

# https://www.baidu.com/s?wd=%E6%B5%B7%E8%B4%BC%E7%8E%8B

import urllib.parse

name = { 
         'wd':'海贼王'}

name = urllib.parse.urlencode(name)

print(name)
结果
wd=%E6%B5%B7%E8%B4%BC%E7%8E%8B
  • 练习一
# 请输入要搜索的内容，并把搜索结果，保存到当前目录 帅哥.html

import urllib.request
import urllib.parse

# https://www.baidu.com/s?wd=%E6%B5%B7%E8%B4%BC%E7%8E%8B

# 拼接url
baseurl = 'https://www.baidu.com/s?'

name = input('请输入要搜索的内容：')

# 进行urlencode()编码
wd = { 
         'wd':name}

name = urllib.parse.urlencode(wd)

url = baseurl + name

# print(url)
headers = { 
         
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400','Cookie':'BAIDUID=0E1D7663D747715D94313EFB4E2C33AC:FG=1; BIDUPSID=0E1D7663D747715D94313EFB4E2C33AC; PSTM=1587718856; BD_UPN=1a314753; BDUSS=lna0k2Tm1aVmV1dGgzQmlqSGRORE1EbEJrVTZXNFJNTXJlVHB5eXRmQjJRRDFmSUFBQUFBJCQAAAAAAAAAAAEAAAB73m8ltPS09LXEuMK4wjEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHazFV92sxVfVT; MCITY=-%3A; BDUSS_BFESS=lna0k2Tm1aVmV1dGgzQmlqSGRORE1EbEJrVTZXNFJNTXJlVHB5eXRmQjJRRDFmSUFBQUFBJCQAAAAAAAAAAAEAAAB73m8ltPS09LXEuMK4wjEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHazFV92sxVfVT; BDRCVFR[sK1aAlma4-c]=mk3SLVN4HKm; delPer=0; BD_CK_SAM=1; PSINO=1; BDRCVFR[S_ukKV6dOkf]=mk3SLVN4HKm; BD_HOME=1; BDRCVFR[feWj1Vr5u3D]=I67x6TjHwwYf0; H_PS_645EC=1ca8wohXaH4gHIjrqDXVa0cDekSx3Kaem5kzoR%2BMTsGHRIld8yQe%2BpZqvbk; BDORZ=B490B5EBF6F3CD402E515D22BCDA1598; H_PS_PSSID=1421_32439_32532_32328_32348_32045_32270_32115_31322_22157'
}
# 创建请求对象
req = urllib.request.Request(url,headers=headers)

# 获取响应对象
res = urllib.request.urlopen(req)

# 读取响应对象内容
html = res.read().decode('utf-8')

# 写入文件
with open('结果.html','w',encoding='utf-8') as f:

    f.write(html)
结果
输出一个html文件

quote(字符串) (这个⾥⾯的参数是个字符串)

  • 百度贴吧练习一
# 需求：输入要爬取贴吧的名称，输入爬取的起始页和终止页，把每一页保存到本地
# 分析：1.找url的规律
# 第一页 https://tieba.baidu.com/f?kw=%E5%A6%B9%E5%AD%90&pn=0
# 第二页 https://tieba.baidu.com/f?kw=%E5%A6%B9%E5%AD%90&pn=50
# 第三页 https://tieba.baidu.com/f?kw=%E5%A6%B9%E5%AD%90&pn=100
# 第四页 https://tieba.baidu.com/f?kw=%E5%A6%B9%E5%AD%90&pn=(n-1)*50
# 页数规律 pn = (当前页数-1)*50
# 分析：2.获取网页内容
# 分析：3.获取数据
  • 使用User-Agent时候，为了不让百度知道是人是鬼在操作，引入random
import random
import urllib.request
import urllib.parse
# 随机获取一个ua,去百度上找常见的User-Agent大全.可以多放几个

headers_list = [{ 
         
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
},{ 
         'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.163 Safari/535.1'}]

headers = random.choice(headers_list)

name = input('请输入贴吧名：')

start = int(input('请输入起始页：'))

end = int(input('请输入结束页：'))

# 对贴吧name进行编码
kw = { 
         'kw':name}

kw = urllib.parse.urlencode(kw)

# 拼接url 发请求 获得响应 保存数据
# 不是一页，要循环
for i in range(start,end+1):

    # 拼接url
    pn = (i-1)*50
    baseurl = 'https://tieba.baidu.com/f?'

    url = baseurl + kw + '&pn=' + str(pn)

    # 发起请求
    req = urllib.request.Request(url,headers=headers)

    # 获得响应
    res = urllib.request.urlopen(req)

    # 读取
    html = res.read().decode('utf-8')

    # 写入文件
    filename = '第' + str(i) + '页.html'

    with open(filename,'w',encoding='utf-8') as f:

        print(f'正在爬取第{i}页')

        f.write(html)
结果

在这里插入图片描述

  • 练习二
# import random
import urllib.request
import urllib.parse

# 读取页面的逻辑封装
def readPage(url):

    headers = { 
         
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
    }

    # 发起请求
    req = urllib.request.Request(url, headers=headers)

    # 获得响应
    res = urllib.request.urlopen(req)

    # 读取
    html = res.read().decode('utf-8')

    return html

# 写入文件
def writePage(filename,html):

    with open(filename, 'w', encoding='utf-8') as f:

        f.write(html)

# 主函数
def main():

    name = input('请输入贴吧名：')

    start = int(input('请输入起始页：'))

    end = int(input('请输入结束页：'))

    # 对贴吧name进行编码
    kw = { 
         'kw': name}

    kw = urllib.parse.urlencode(kw)

    for i in range(start,end+1):

        # 拼接url
        pn = (i - 1) * 50
        baseurl = 'https://tieba.baidu.com/f?'

        url = baseurl + kw + '&pn=' + str(pn)

        html = readPage(url)

        filename = '第' + str(i) + '页.html'

        writePage(filename,html)

if __name__ == '__main__':

    main()

结果三个页面
请输入贴吧名：帅哥
请输入起始页：1
请输入结束页：3
  • 练习三 类对象实现
import urllib.request
import urllib.parse

class BaiduSpider:

    def __init__(self):

        #把常用的不变的放到init方法里面
        self.headers = { 
         
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
        }
        self.baseurl = 'https://tieba.baidu.com/f?'


    def readPage(self,url):

        # 发起请求
        req = urllib.request.Request(url, headers=self.headers)

        # 获得响应
        res = urllib.request.urlopen(req)

        # 读取
        html = res.read().decode('utf-8')

        return html

    def writePage(self,filename,html):

        with open(filename,'w',encoding='utf-8') as f:

            f.write(html)

    def main(self):

        name = input('请输入贴吧名：')

        start = int(input('请输入起始页：'))

        end = int(input('请输入结束页：'))

        # 对贴吧name进行编码
        kw = { 
         'kw': name}

        kw = urllib.parse.urlencode(kw)

        for i in range(start, end + 1):
            # 拼接url
            pn = (i - 1) * 50

            url = self.baseurl + kw + '&pn=' + str(pn)

            html = self.readPage(url)

            filename = '第' + str(i) + '页.html'

            self.writePage(filename, html)


if __name__ == '__main__':

    # 如果要调用类对象中的main方法，
    #先需要实例化
    spider = BaiduSpider()

    spider.main()

3 请求⽅式

  • GET 特点 ：查询参数在URL地址中显示

  • POST 在Request⽅法中添加data参数 urllib.request.Request(url,data=data,headers=headers) data ：表单数据以bytes类型提交,不能是str

  • 有道翻译练习

import urllib.request
import urllib.parse
import json

# 请输入你要翻译的内容

key = input('请输入要翻译的内容：')

# 把需要提交的form表单数据转换为bytes类型的数据 为什么就知道用form表单里的东西

data = { 
         
    'i': key,

    'from': 'AUTO',
    'smartresult': 'dict',
    'client': 'fanyideskweb',
    'salt': '15980993133958',
    'sign': '8d249124b310aa8e7fa82f24049ff7b7',
    'lts': '1598099313395',
    'bv': '94d04da9bee8870ad9ad8714b54f2bea',
    'doctype': 'json',
    'version': '2.1',
    'keyfrom': 'fanyi.web',
    'action': 'FY_BY_REALTlME'

}

data = urllib.parse.urlencode(data)

# 把data转换为字节
data = bytes(data,'utf-8')

# 发请求获取响应 注意需要去掉_o
url = 'http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule'

headers = { 
         
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
    }

req = urllib.request.Request(url,data=data,headers=headers)
res = urllib.request.urlopen(req)
html = res.read().decode('utf-8')

# 这是一个json类型的字符串 {"type":"EN2ZH_CN","errorCode":0,"elapsedTime":1,"translateResult":[[{"src":"money","tgt":"钱"}]]}

# 将上述html的json类型的字符串变为字典dict
r_dict = json.loads(html)
r = r_dict['translateResult']  # 结果就是这个列表[[{"src":"money","tgt":"钱"}]]
result = r[0][0]['tgt']  # [{"src":"money","tgt":"钱"}] --> 字典 {"src":"money","tgt":"钱"}
print(result)

请输入要翻译的内容：luck
运气

4 requests模块

4.1 安装

pip install requests 在开发⼯具中安装

4.2 request常⽤⽅法

requests.get（⽹址）

4.3 响应对象response的⽅法

response.text 返回unicode格式的数据(str)

print(response.text) # 返回的是str类型

response.content 返回字节流数据(⼆进制)

print(response.content) # 返回的是字节流

response.content.decode(‘utf-8’) ⼿动进⾏解码

print(response.content.decode('utf-8')) # ⼿动进⾏解码

response.url 返回url response.encode() = ‘编码’ 可以解决乱码问题

import requests

response = requests.get('http://www.qqbiaoqing.com/gaoxiao/')

# print(response.content.decode('utf-8'))

response.encoding = 'utf-8' # 如果没有这句，就会乱码
print(response.text)

4.4 requests模块发送 POST请求


import requests
import json

key = input('请输入翻译的内容')

# 把需要提交的form表单数据转换为bytes类型的数据 为什么就知道用form表单里的东西，因为输入的要素只出现在form表单里，所以去这找结果

data = { 
         
    'i': key,

    'from': 'AUTO',
    'smartresult': 'dict',
    'client': 'fanyideskweb',
    'salt': '15980993133958',
    'sign': '8d249124b310aa8e7fa82f24049ff7b7',
    'lts': '1598099313395',
    'bv': '94d04da9bee8870ad9ad8714b54f2bea',
    'doctype': 'json',
    'version': '2.1',
    'keyfrom': 'fanyi.web',
    'action': 'FY_BY_REALTlME'

}

url = 'http://fanyi.youdao.com/translate?smartresult=dict&smartresult=rule'

headers = { 
         
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400'
    }

res = requests.post(url,data=data,headers=headers)

res.encoding = 'utf-8'

html = res.text
r_dict = json.loads(html)
result = r_dict['translateResult'][0][0]['tgt']

print(result)

请输入翻译的内容蜘蛛侠
spider-man

4.5 requests设置代理

使⽤requests添加代理只需要在请求⽅法中(get/post)传递proxies参数就可 以了 设置代理 http://www.httpbin.org/ip 代理⽹站 ⻄刺免费代理IP：http://www.xicidaili.com/ 快代理：http://www.kuaidaili.com/ 代理云：http://www.dailiyun.com/

import requests

# 设置代理
proxy = { 
         
    'http':'116.196.85.190:3128'
}
url = 'http://www.httpbin.org/ip'

res = requests.get(url,proxies=proxy)

print(res.text)

4.6 cookie

cookie ：通过在客户端记录的信息确定⽤户身份，一旦确定之后，不用重复登录

HTTP是⼀种⽆连接协议,客户端和服务器交互仅仅限于 请求/响应过程,结束后断开,下⼀次请求时,服务器会认为是⼀个新的客户端,为了维护他们之间的连接,让服务器知道这是前⼀个⽤户发起的请求,必须在⼀个地⽅保存客户端信息。

  • 练习模拟登陆知乎

import requests

# resp = requests.get('https://www.baidu.com/')
#
# # print(resp.cookies.get_dict())

# 模拟登陆知乎
url = 'https://www2.zhihu.com/hot'

headers = { 
         
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.25 Safari/537.36 Core/1.70.3775.400 QQBrowser/10.6.4208.400','cookie':'d_c0="AIBf6s8OKxGPTsCiOuJyoRVgNBjHstjKmcg=|1587727340"; _zap=6fc01f58-8fb3-4545-a781-417edf50e819; z_c0="2|1:0|10:1590034345|4:z_c0|92:Mi4xWG5HTEV3QUFBQUFBZ0ZfcXp3NHJFU1lBQUFCZ0FsVk5xVTJ6WHdBbm5kUGtSLXJQb2FMU1hENzN4S2FmbDVaTEln|b476020625a8a9eb38d3924904d14ed3f57ad5a55b29d104cf80d35e81bea1ee"; q_c1=c02ae3a1e68047a9965dc958423c0d2a|1597549527000|1590629112000; _xsrf=gBkpgEOmNKWElWsbjf040VnefHxTTo7h; SESSIONID=oEXxVPA7EVUX5OiYt43xIOXiy7UCkPTslsTf8EGneVW; JOID=U1sQBUPv6PqCRVtPRujzLV46uYVTzs3ar296ambFyd-iaHFuY874tNpOX0pL48DS0lAf9RdCtJESk6_0u8T_Xwg=; osd=UFoUBkPs6f6BRVhOQuvzLl8-uoVQz8nZr2x7bmXFyt6ma3FtYsr7tNlPW0lL4MHW0VAc9BNBtJITl6z0uMX7XAg=; tst=h; KLBRSID=ca494ee5d16b14b649673c122ff27291|1598232043|1598231842; tshl='
    }

resp = requests.get(url,headers=headers)

print(resp.text)

4.7 session

session ：通过在服务端记录的信息确定⽤户身份 这⾥这个session就是⼀个指的是会话

  • 案例演示 首先对12306验证图片的获取–显得臃肿
import base64
# 需要删掉 data:image/jpg;base64,
url = 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