Requests模块

一 Requests模块简介

#介绍:使用requests可以模拟浏览器的请求,比起之前用到的urllib,requests模块的api更加便捷(本质就是封装了urllib3)

#注意:requests库发送请求将网页内容下载下来以后,并不会执行js代码,这需要我们自己分析目标站点然后发起新的request请求

#安装:pip3 install requests

#各种请求方式:常用的就是requests.get()和requests.post()
>>> import requests
>>> r = requests.get('https://api.github.com/events')
>>> r = requests.post('http://httpbin.org/post', data = {'key':'value'})
>>> r = requests.put('http://httpbin.org/put', data = {'key':'value'})
>>> r = requests.delete('http://httpbin.org/delete')
>>> r = requests.head('http://httpbin.org/get')
>>> r = requests.options('http://httpbin.org/get')

#建议在正式学习requests前,先熟悉下HTTP协议
https://www.cnblogs.com/liuqingzheng/p/10191056.html

官网链接:http://docs.python-requests.org/en/master/

二 基于GET请求

1、基本请求

import requests
response=requests.get('http://dig.chouti.com/')
print(response.text)

2、带参数的GET请求->params

import requests
response=requests.get('https://www.baidu.com/s?wd=python&pn=1',
                      headers={
                        'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36',
                      })
print(response.text)
# response.encoding=response.apparent_encoding
with open('ptyhon.html','wb') as f:
    f.write(response.content)
#如果查询关键词是中文或者有其他特殊符号,则不得不进行url编码
from urllib.parse import urlencode
wd='美女'
encode_res=urlencode({'k':wd},encoding='utf-8')
keyword=encode_res.split('=')[1]
print(keyword)
# 然后拼接成url
url='https://www.baidu.com/s?wd=%s&pn=1' %keyword

response=requests.get(url,
                      headers={
                        'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36',
                      })

with open('girl.html','wb') as f:
    f.write(response.content)

3、带参数的GET请求->headers

#通常我们在发送请求时都需要带上请求头,请求头是将自身伪装成浏览器的关键,常见的有用的请求头如下
Host
Referer #大型网站通常都会根据该参数判断请求的来源
User-Agent #客户端
Cookie #Cookie信息虽然包含在请求头里,但requests模块有单独的参数来处理他,headers={}内就不要放它了
#添加headers(浏览器会识别请求头,不加可能会被拒绝访问,比如访问https://www.zhihu.com/explore)
import requests
response=requests.get('https://www.zhihu.com/explore')
response.status_code #500


#自己定制headers
headers={
    'User-Agent':'Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.76 Mobile Safari/537.36',

}
respone=requests.get('https://www.zhihu.com/explore',
                     headers=headers)
print(respone.status_code) #200
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4、带参数的GET请求->cookies

import requests

Cookies={   'user_session':'rzNme4L6LTH7QSresq8w0BVYhTNt5GS-asNnkOe7_FZ2CjB6',
}

response=requests.get('https://github.com/settings/emails',
             cookies=Cookies) #github对请求头没有什么限制,我们无需定制user-agent,对于其他网站可能还需要定制


print('306334678@qq.com' in response.text) #True
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三 基于POST请求

1 介绍

#GET请求
HTTP默认的请求方法就是GET
     * 没有请求体
     * 数据必须在1K之内!
     * GET请求数据会暴露在浏览器的地址栏中

GET请求常用的操作:
       1. 在浏览器的地址栏中直接给出URL,那么就一定是GET请求
       2. 点击页面上的超链接也一定是GET请求
       3. 提交表单时,表单默认使用GET请求,但可以设置为POST


#POST请求
(1). 数据不会出现在地址栏中
(2). 数据的大小没有上限
(3). 有请求体
(4). 请求体中如果存在中文,会使用URL编码!


#!!!requests.post()用法与requests.get()完全一致,特殊的是requests.post()有一个data参数,用来存放请求体数据

2、发送post请求,模拟浏览器的登录行为

#对于登录来说,应该输错用户名或密码然后分析抓包流程,用脑子想一想,输对了浏览器就跳转了,还分析个毛线,累死你也找不到包
'''
一 目标站点分析
    浏览器输入https://github.com/login
    然后输入错误的账号密码,抓包
    发现登录行为是post提交到:https://github.com/session
    而且请求头包含cookie
    而且请求体包含:
        commit:Sign in
        utf8:✓
        authenticity_token:lbI8IJCwGslZS8qJPnof5e7ZkCoSoMn6jmDTsL1r/m06NLyIbw7vCrpwrFAPzHMep3Tmf/TSJVoXWrvDZaVwxQ==
        login:egonlin
        password:123


二 流程分析
    先GET:https://github.com/login拿到初始cookie与authenticity_token
    返回POST:https://github.com/session, 带上初始cookie,带上请求体(authenticity_token,用户名,密码等)
    最后拿到登录cookie

    ps:如果密码时密文形式,则可以先输错账号,输对密码,然后到浏览器中拿到加密后的密码,github的密码是明文
'''

import requests
import re

#第一次请求
r1=requests.get('https://github.com/login')
r1_cookie=r1.cookies.get_dict() #拿到初始cookie(未被授权)
authenticity_token=re.findall(r'name="authenticity_token".*?value="(.*?)"',r1.text)[0] #从页面中拿到CSRF TOKEN

#第二次请求:带着初始cookie和TOKEN发送POST请求给登录页面,带上账号密码
data={
    'commit':'Sign in',
    'utf8':'',
    'authenticity_token':authenticity_token,
    'login':'317828332@qq.com',
    'password':'alex3714'
}
r2=requests.post('https://github.com/session',
             data=data,
             cookies=r1_cookie
             )


login_cookie=r2.cookies.get_dict()


#第三次请求:以后的登录,拿着login_cookie就可以,比如访问一些个人配置
r3=requests.get('https://github.com/settings/emails',
                cookies=login_cookie)

print('317828332@qq.com' in r3.text) #True
自动登录gitbub(自己处理cookies))
import requests
import re

session=requests.session()
#第一次请求
r1=session.get('https://github.com/login')
authenticity_token=re.findall(r'name="authenticity_token".*?value="(.*?)"',r1.text)[0] #从页面中拿到CSRF TOKEN

#第二次请求
data={
    'commit':'Sign in',
    'utf8':'',
    'authenticity_token':authenticity_token,
    'login':'317828332@qq.com',
    'password':'alex3714'
}
r2=session.post('https://github.com/session',
             data=data,
             )

#第三次请求
r3=session.get('https://github.com/settings/emails')

print('317828332@qq.com' in r3.text) #True
requests.session()自动帮我们保存cookie信息

3、补充json

requests.post(url='xxxxxxxx',
              data={'xxx':'yyy'}) #没有指定请求头,#默认的请求头:application/x-www-form-urlencoed

#如果我们自定义请求头是application/json,并且用data传值, 则服务端取不到值
requests.post(url='',
              data={'':1,},
              headers={
                  'content-type':'application/json'
              })


requests.post(url='',
              json={'':1,},
              ) #默认的请求头:application/json
json的用法

四 响应Response

1、response属性

import requests
respone=requests.get('http://www.jianshu.com')
# respone属性
print(respone.text)
print(respone.content)

print(respone.status_code)
print(respone.headers)
print(respone.cookies)
print(respone.cookies.get_dict())
print(respone.cookies.items())

print(respone.url)
print(respone.history)

print(respone.encoding)

#关闭:response.close()
from contextlib import closing
with closing(requests.get('xxx',stream=True)) as response:
    for line in response.iter_content():
        pass

2、编码问题

#编码问题
import requests
response=requests.get('http://www.autohome.com/news')
# response.encoding='gbk' #汽车之家网站返回的页面内容为gb2312编码的,而requests的默认编码为ISO-8859-1,如果不设置成gbk则中文乱码
print(response.text)
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3、获取二进制数据

import requests

response=requests.get('https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1509868306530&di=712e4ef3ab258b36e9f4b48e85a81c9d&imgtype=0&src=http%3A%2F%2Fc.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2F11385343fbf2b211e1fb58a1c08065380dd78e0c.jpg')

with open('a.jpg','wb') as f:
    f.write(response.content)
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#stream参数:一点一点的取,比如下载视频时,如果视频100G,用response.content然后一下子写到文件中是不合理的

import requests

response=requests.get('https://gss3.baidu.com/6LZ0ej3k1Qd3ote6lo7D0j9wehsv/tieba-smallvideo-transcode/1767502_56ec685f9c7ec542eeaf6eac93a65dc7_6fe25cd1347c_3.mp4',
                      stream=True)

with open('b.mp4','wb') as f:
    for line in response.iter_content():
        f.write(line)
获取二进制流

4、解析json

#解析json
import requests
response=requests.get('http://httpbin.org/get')

import json
res1=json.loads(response.text) #太麻烦

res2=response.json() #直接获取json数据


print(res1 == res2) #True
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5、Redirection and History

import requests
import re

#第一次请求
r1=requests.get('https://github.com/login')
r1_cookie=r1.cookies.get_dict() #拿到初始cookie(未被授权)
authenticity_token=re.findall(r'name="authenticity_token".*?value="(.*?)"',r1.text)[0] #从页面中拿到CSRF TOKEN

#第二次请求:带着初始cookie和TOKEN发送POST请求给登录页面,带上账号密码
data={
    'commit':'Sign in',
    'utf8':'',
    'authenticity_token':authenticity_token,
    'login':'317828332@qq.com',
    'password':'alex3714'
}






#测试一:没有指定allow_redirects=False,则响应头中出现Location就跳转到新页面,r2代表新页面的response
r2=requests.post('https://github.com/session',
             data=data,
             cookies=r1_cookie
             )

print(r2.status_code) #200
print(r2.url) #看到的是跳转后的页面
print(r2.history) #看到的是跳转前的response
print(r2.history[0].text) #看到的是跳转前的response.text


#测试二:指定allow_redirects=False,则响应头中即便出现Location也不会跳转到新页面,r2代表的仍然是老页面的response
r2=requests.post('https://github.com/session',
             data=data,
             cookies=r1_cookie,
             allow_redirects=False
             )


print(r2.status_code) #302
print(r2.url) #看到的是跳转前的页面https://github.com/session
print(r2.history) #[]
利用github登录后跳转到主页面的例子来验证

五 高级用法

1、SSL Cert Verification

#证书验证(大部分网站都是https)
import requests
respone=requests.get('https://www.12306.cn') #如果是ssl请求,首先检查证书是否合法,不合法则报错,程序终端


#改进1:去掉报错,但是会报警告
import requests
respone=requests.get('https://www.12306.cn',verify=False) #不验证证书,报警告,返回200
print(respone.status_code)


#改进2:去掉报错,并且去掉警报信息
import requests
from requests.packages import urllib3
urllib3.disable_warnings() #关闭警告
respone=requests.get('https://www.12306.cn',verify=False)
print(respone.status_code)

#改进3:加上证书
#很多网站都是https,但是不用证书也可以访问,大多数情况都是可以携带也可以不携带证书
#知乎百度等都是可带可不带
#有硬性要求的,则必须带,比如对于定向的用户,拿到证书后才有权限访问某个特定网站
import requests
respone=requests.get('https://www.12306.cn',
                     cert=('/path/server.crt',
                           '/path/key'))
print(respone.status_code)
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2、使用代理

#官网链接: http://docs.python-requests.org/en/master/user/advanced/#proxies

#代理设置:先发送请求给代理,然后由代理帮忙发送(封ip是常见的事情)
import requests
proxies={
    'http':'http://egon:123@localhost:9743',#带用户名密码的代理,@符号前是用户名与密码
    'http':'http://localhost:9743',
    'https':'https://localhost:9743',
}
respone=requests.get('https://www.12306.cn',
                     proxies=proxies)

print(respone.status_code)



#支持socks代理,安装:pip install requests[socks]
import requests
proxies = {
    'http': 'socks5://user:pass@host:port',
    'https': 'socks5://user:pass@host:port'
}
respone=requests.get('https://www.12306.cn',
                     proxies=proxies)

print(respone.status_code)
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3、超时设置

#超时设置
#两种超时:float or tuple
#timeout=0.1 #代表接收数据的超时时间
#timeout=(0.1,0.2)#0.1代表链接超时  0.2代表接收数据的超时时间

import requests
respone=requests.get('https://www.baidu.com',
                     timeout=0.0001)
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4、 认证设置

#官网链接:http://docs.python-requests.org/en/master/user/authentication/

#认证设置:登陆网站是,弹出一个框,要求你输入用户名密码(与alter很类似),此时是无法获取html的
# 但本质原理是拼接成请求头发送
#         r.headers['Authorization'] = _basic_auth_str(self.username, self.password)
# 一般的网站都不用默认的加密方式,都是自己写
# 那么我们就需要按照网站的加密方式,自己写一个类似于_basic_auth_str的方法
# 得到加密字符串后添加到请求头
#         r.headers['Authorization'] =func('.....')

#看一看默认的加密方式吧,通常网站都不会用默认的加密设置
import requests
from requests.auth import HTTPBasicAuth
r=requests.get('xxx',auth=HTTPBasicAuth('user','password'))
print(r.status_code)

#HTTPBasicAuth可以简写为如下格式
import requests
r=requests.get('xxx',auth=('user','password'))
print(r.status_code)
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5、异常处理

#异常处理
import requests
from requests.exceptions import * #可以查看requests.exceptions获取异常类型

try:
    r=requests.get('http://www.baidu.com',timeout=0.00001)
except ReadTimeout:
    print('===:')
# except ConnectionError: #网络不通
#     print('-----')
# except Timeout:
#     print('aaaaa')

except RequestException:
    print('Error')
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6、上传文件

import requests
files={'file':open('a.jpg','rb')}
respone=requests.post('http://httpbin.org/post',files=files)
print(respone.status_code)
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六 案例

import requests
import re
import time

def get_page(url):
    try:
        response=requests.get(url)
        if response.status_code==200:
            return response.text
    except Exception as e:
        print(e)
def get_detail(index_page):
    urls=re.findall('class="categoryem".*?href="(.*?)"',index_page,re.S)
    # print(urls)
    for url in urls:
        yield 'https://www.pearvideo.com/'+url

def pase_detail(detail_page):
    # print(detail_page)
    down_url=re.findall('srcUrl="(.*?)"',detail_page,re.S)[0]
    print(down_url)
    return down_url

def get_movie(url):
    response=requests.get(url)
    with open('movie/%s.mp4'%str(time.time()),'wb') as f:
        f.write(response.content)
        print('下载成功')
if __name__ == '__main__':
    index_page=get_page('https://www.pearvideo.com/category_loading.jsp?reqType=5&categoryId=8&start=24')
    urls=get_detail(index_page)
    for url in urls:
        print(url)
        detail_page=get_page(url)
        mp4_url=pase_detail(detail_page)
        get_movie(mp4_url)
单线程下载梨视频
import requests
import re
import time
from concurrent.futures import ThreadPoolExecutor
pool=ThreadPoolExecutor(50)
def get_page(url):
    try:
        response=requests.get(url)
        if response.status_code==200:
            return response.text
    except Exception as e:
        print(e)
def pase_index(index_page):
    index_page=index_page.result()
    urls=re.findall('class="categoryem".*?href="(.*?)"',index_page,re.S)
    # print(urls)
    for url in urls:
        next_url= 'https://www.pearvideo.com/'+url
        pool.submit(get_page, next_url).add_done_callback(pase_detail)

def pase_detail(detail_page):
    detail_page=detail_page.result()
    # print(detail_page)
    down_url=re.findall('srcUrl="(.*?)"',detail_page,re.S)[0]
    pool.submit(get_movie, down_url)

def get_movie(url):
    print(url)
    response=requests.get(url)
    with open('movie/%s.mp4'%str(time.time()),'wb') as f:
        f.write(response.content)
        print('下载成功')
if __name__ == '__main__':
    for i in range(5):
        url='https://www.pearvideo.com/category_loading.jsp?reqType=5&categoryId=8&start=%s'%((i+1)*12)
        pool.submit(get_page, url).add_done_callback(pase_index)
线程池下载梨视频
import requests
from bs4 import BeautifulSoup
import os
for i in range(1, 10):
    ret = requests.get(url='https://www.autohome.com.cn/news/%s/#liststart' % (i,))
    ret.encoding = ret.apparent_encoding
    soup = BeautifulSoup(ret.text, 'lxml')
    div = soup.find(name='div', attrs={'id': 'auto-channel-lazyload-article'})
    li_list = div.find_all(name='li')
    for li in li_list:
        h3 = li.find(name='h3')
        if not h3:
            continue
        p_text = li.find(name='p').text
        href = li.find(name='a').get('href')
        img = li.find(name='img').get('src')

        print('''
        新闻标题:%s
        新闻简介:%s
        新闻地址:%s
        新闻图片:%s
        ''' % (h3.text, p_text, 'https:' + href, 'https:' + img))
        ret_photo = requests.get(url='https:' + img)
        photo_name = img.rsplit('__', 1)[-1]
        if not os.path.exists('download'):
            os.mkdir('download')
        with open('download/' + photo_name, 'wb') as f:
            f.write(ret_photo.content)
获取汽车之家新闻并保存图片
import requests
from  bs4 import BeautifulSoup
import time


# 打开抽屉首页
ret = requests.get(url='https://dig.chouti.com/',
                   headers={
                       'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36',
                       # 'accept-language': 'zh-CN,zh;q=0.9'
                   }
                   )
# print(ret.text)
coo = ret.cookies.get_dict()
print(coo)
# 8613121758648
# woshiniba
# 登录到抽屉
ret_login = requests.post(url='https://dig.chouti.com/login',
                          headers={
                              'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
                          },
                          data={
                              'phone': '8618953675221',
                              'password': 'lqz123',
                              'oneMonth': '1'
                          },
                          cookies=coo

                          )
print(ret_login.text)
# print(ret_login.cookies.get_dict())
# https://dig.chouti.com/link/vote?linksId=21055766
# ret_post = requests.post(url='https://dig.chouti.com/link/vote?linksId=21055766',
#                          headers={
#                              'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
#                          },
#                          cookies=coo
#                          )
# print(ret_post.text)

for i in range(2,3):
    ret_index = requests.get(url='https://dig.chouti.com/all/hot/recent/%s'%i,
                             headers={
                                 'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36',
                             }
                             )
    soup = BeautifulSoup(ret_index.text, 'html.parser')
    div = soup.find(name='div', attrs={'id': 'content-list'})
    # print(div)
    item_list = div.find_all(name='div', attrs={'class': 'item'})
    print(item_list)
    for item in item_list:
        part2_div = item.find(name='div', attrs={'class': 'part2'})
        nid = part2_div.get('share-linkid')
        print(nid)
        time.sleep(0.5)
        ret_post = requests.post(url='https://dig.chouti.com/link/vote?linksId=%s' % nid,
                                 headers={
                                     'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
                                 },
                                 cookies=coo
                                 )
        print(ret_post.text)
# 给文章评论
# ret_post = requests.post(url='https://dig.chouti.com/comments/create',
#                          headers={
#                              'user-agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36'
#                          },
#                          cookies=coo,
#                          data={
#                              'jid': 'cdu_53207078460',
#                              'linkId': '21061426',
#                              'isAssent': '',
#                              'content': '写的真好',
#                              'sortType':'score'
#
# }
# )
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原文地址:https://www.cnblogs.com/bubu99/p/13769333.html