Python之Requests请求数据

约定不等于承诺〃 2022-03-22 02:54 403阅读 0赞

## 安装 ##

pip install requests

## 用法 ##

import requests,json
    #get请求=================================================
    
    #params用来加参数,headers来传headers参数
    '''
    payload = {'key1':'value1','key2':'value2'}
    headers = {'content-type':'application/json'}
    r = requests.get('http://httpbin.org/get',params=payload,headers=headers)
    print(r.url)
    #http://httpbin.org/get?key2=value2&key1=value1
    '''
    #请求json文件
    '''
    r = requests.get("http://100.39.8.54:8080/a.json")
    print(r.text)
    print(r.json())
    '''
    #获取来自服务器的原始套接字响应,在初始请求中设置stream=True
    '''
    r = requests.get('https://github.com/timeline.json',stream=True)
    print(r.raw)
    #<urllib3.response.HTTPResponse object at 0x00000000034ECB70>
    print(r.raw.read(10))
    #b'{"message"'
    '''
    
    #post请求================================================
    
    #利用data来传参数,表单形式
    '''
    payload = {'key1':'value1','key2':'value2'}
    r = requests.post("http://httpbin.org/post",data=payload)
    print(r.text)
    '''
    '''
    {
     	"args": {}, 
    	"data": "", 
    	"files": {}, 
    	 "form": {
    	   "key1": "value1", 
    	   "key2": "value2"
    	 }, 
    	 "headers": {
    	   "Accept": "*/*", 
    	   "Accept-Encoding": "gzip, deflate", 
    	   "Connection":"close",
    	   "Content-Length": "23", 
    	   "Content-Type": "application/x-www-form-urlencoded", 
    	   "Host": "httpbin.org", 
    	   "User-Agent": "python-requests/2.18.4"
    	 }, 
    	 "json": null, 
    	 "origin":"124.65.241.202",
    	 "url": "http://httpbin.org/post"
    }
    '''
    #利用json.dumps()把表单数据序列化，传json格式
    '''
    url = 'http://httpbin.org/post'
    payload = {'some':'data'}
    r = requests.post(url,data=json.dumps(payload))
    print(r.text)
    '''
    '''
    {
     "args": {}, 
     "data": "{\"some\": \"data\"}", 
     "files": {}, 
     "form": {}, 
     "headers": {
       "Accept": "*/*", 
       "Accept-Encoding": "gzip, deflate",
       "Connection":"close", 
       "Content-Length": "16", 
       "Host": "httpbin.org", 
       "User-Agent": "python-requests/2.18.4"
     }, 
     "json": {
       "some": "data"
     },  
     "url": "http://httpbin.org/post"
    }
    '''
    #用file参数上传文件
    '''
    url = 'http://httpbin.org/post'
    files = {'file':open('a.txt','rb')}#a.txt里面内容为hello world!
    r = requests.post(url,files=files)
    print(r.text)
    '''
    '''
    {
     "args": {}, 
     "data": "", 
     "files": {
       "file": "Hello World!"
     }, 
     "form": {}, 
     "headers": {
       "Accept": "*/*", 
       "Accept-Encoding": "gzip, deflate", 
       "Connection":"close", 
       "Content-Length": "153", 
       "Content-Type": "multipart/form-data; >boundary=7d8eb5ff99a04c11bb3e862ce78d7000", 
       "Host": "httpbin.org", 
       "User-Agent": "python-requests/2.18.4"
     }, 
     "json": null, 
     "origin":"124.65.241.202",
     "url": "http://httpbin.org/post"
    }
    '''
    #requests是支持流式上传的，允许发送大的数据流而无需先把他们读入内存。要使用流式上传，需要为请求体提供一个类文件对象。
    '''
    with open('massive-body') as f:
    	response = requests.post('http://some.url/streamed',data=f)
    	print(response.text)
    '''
    
    #Cookies======================================================
    '''
    response = requests.get("http://www.baidu.com/")
    #返回CookieJar对象
    cookiejar = response.cookies
    #将CookieJar转为字典
    cookiedict = requests.utils.dict_from_cookiejar(cookiejar)
    print(cookiejar)
    print(cookiedict)
    '''
    '''
    <RequestsCookieJar[<Cookie BDORZ=27315 for .baidu.com/>]>
    {'BDORZ': '27315'}
    '''
    
    #超时配置=====================================================
    #timeout变量来配置最大请求时间，timeout仅对连接过程有效，与响应体的下载无关
    '''
    r = requests.get('http://github.com',timeout=0.001)
    print(r)
    '''
    
    #会话对象=====================================================
    #通过cookies实现持久会话
    '''
    #会话1：
    s = requests.Session()
    #设置cookies
    s.get('http://httpbin.org/cookies/set/sessioncookie/123456789')
    #获得cookies
    r = s.get("http://httpbin.org/cookies")
    print(r.text)
    '''
    '''
    {
      "cookies": {
        "sessioncookie": "123456789"
      }
    }
    '''
    #会话是一个全局变量，进行全局配置
    '''
    s = requests.Session()
    s.headers.update({'x-test':'true'})
    r = s.get('http://httpbin.org/headers',headers={'x-test2':'true'})
    print(r.text)
    '''
    '''
    {
      "headers": {
        "Accept": "*/*",
        "Accept-Encoding": "gzip, deflate",
        "Connection": "close",
        "Host": "httpbin.org",
        "User-Agent": "python-requests/2.18.4",
        "X-Test": "true",
        "X-Test2": "true"
      }
    }
    '''
    #如果不想要全局配置中的一个变量设置为None即可
    '''
    s = requests.Session()
    s.headers.update({'x-test':'true'})
    r = s.get('http://httpbin.org/headers',headers={'x-test':None})
    print(r.text)
    '''
    '''
    {
      "headers": {
        "Accept": "*/*",
        "Accept-Encoding": "gzip, deflate",
        "Connection": "close",
        "Host": "httpbin.org",
        "User-Agent": "python-requests/2.18.4"
      }
    }
    '''
    
    #SSL证书验证===============================================
    #Requests可以为HTTPS请求验证SSL证书，就想web浏览器一样
    #如果想跳过12306的证书验证，把verify设置为False即可
    '''
    r = requests.get('https://kyfw.12306.cn/otn/',verify=False)
    print(r.text)
    '''
    '''
    也可以引入Python关于证书的处理模块SSL
    1.导入Python SSL处理模块
    import ssl
    2.标识忽略未经核实的SSL证书认领
    context = ssl._create_unverified_context()
    '''
    
    #代理======================================================
    #如果需要使用代理，可以通过为任意请求方法提供proxies参数来配置单个请求
    #根据协议类型，选择不同的代理
    '''
    proxies = {
      "https":"http://41.118.132.69:4433",
      "http":"http://41.118.132.69:4433"
    }
    r = requests.post("http://httpbin.org/post",proxies=proxies)
    print(r.text)
    '''
    #私密代理（特定格式）
    #如果代理需要使用HTTP Basic Auth，可以使用下面这种格式
    '''
    proxy = {"http": "mr_mao_hacker:sffqry9r@61.158.163.130:16816"}
    response = requests.get("http://www.baidu.com",proxies = proxy)
    print(response.text)
    '''
    #web客户端验证，需要添加auth=(账户名，密码)
    '''
    auth=('test','123456')
    response = requests.get('http://192.168.199.107',auth = auth)
    print(response.text)
    '''
    #也可以通过环境变量HTTP_PROXY和HTTPS_PROXY来配置代理
    '''
    export HTTP_PROXY = "http://10.10.1.10:3128"
    export HTTPS_PROXY ="HTTP://10.10.1.10:1080"
    '''
    
    #爬取天气
    response = requests.get("http://www.sojson.com/open/api/weather/json.shtml?city=%E9%83%91%E5%B7%9E")
    response.encoding="utf-8"
    print(response.text)