1.请求分析
"""requests库的应用。requests是比python内置urllib库更好的http请求库""" import requests from requests.models import Response res = requests.get("https://www.baidu.com/") # 此处可以换成post,delete,patch等请求 print(type(res)) # <class 'requests.models.Response'> Response类 print(res.status_code) # 请求返回的状态码 200表示成功 print(type(res.text)) # str类型 print(res.text) # 返回文本属性 print(res.cookies) # cookies信息<RequestsCookieJar[<Cookie BDORZ=27315 for .baidu.com/>]> req = requests.get("http://httpbin.org/get") # 可直接添加字典形式的参数请求params=dict() # req = requests.get("http://httpbin.org/get", params=data) print(req.headers) # 获取返回的请求头信息 """ { "args": { # 此处会显示请求的url中参数信息 }, "headers": { # 请求头信息 "Accept": "*/*", "Accept-Encoding": "gzip, deflate", "Connection": "close", # 连接关闭 "Host": "httpbin.org", "User-Agent": "python-requests/2.20.1" # 不设置headers，则显示本身请求信息 }, "origin": "223.73.146.13", "url": "http://httpbin.org/get" }""" # 直接获取返回的字典形式解析结果 rew = requests.get("http://httpbin.org/get") print(type(rew.text)) # str类型 print(rew.json()) # 调用响应类Response的方法json()转换json字符串为字典 print(type(rew.json())) # <class 'dict'>
2.POST请求
"""requests的POST请求和文件上传""" import requests data = {"name": "Jim", "age": "26"} res = requests.post("http://httpbin.org/post", data=data) print(res.text) """ { "args": {}, "data": "", "files": {}, "form": { # post请求的内容 "age": "26", "name": "Jim" }, "headers": { "Accept": "*/*", "Accept-Encoding": "gzip, deflate", "Connection": "close", "Content-Length": "15", "Content-Type": "application/x-www-form-urlencoded", # 请求数据类型 "Host": "httpbin.org", "User-Agent": "python-requests/2.20.1" }, "json": null, "origin": "223.73.146.12", "url": "http://httpbin.org/post" } """ files = {"file": open("favicon.ico", "rb")} ren = requests.post("http://httpbin.org/post", files=files) print(ren.text) """ { "args": {}, "data": "", "files": { # 文件上传内容会有单独的files字段来标明 "file": "data:application/octet-stream;base64" }, "form": {}, # 空form "headers": { "Accept": "*/*", "Accept-Encoding": "gzip, deflate", "Connection": "close", "Content-Length": "6665", # 文件上传类型 "Content-Type": "multipart/form-data; boundary=717f83c70b6a0c14c53c66a11897cc72", "Host": "httpbin.org", "User-Agent": "python-requests/2.20.1" }, "json": null, "origin": "223.73.146.12", "url": "http://httpbin.org/post" } """
3.requests获取多媒体数据
"""获取多媒体二进制数据""" import requests # 获取多媒体二进制数据，比如图标 tag = requests.get("https://github.githubassets.com/favicon.ico") print(tag.text) # 因为是二进制数据，不能直接文本显示。乱码 print(tag.content) # 字符串以b开头的二进制数据 # with open文件操作语句，在打开文件执行操作完成之后自动完成文件关闭。里面必须包含__enter__和__exit__方法 with open("favicon.ico", "wb") as f: # f是获取的文件句柄对象，调用文件句柄的方法完成读写操作。在这里是把图标存入当前目录下 f.write(tag.content)
4.cookies的应用
"""requests中cookies的应用""" import requests headers={"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3554.0 Safari/537.36"} res = requests.get("https://www.baidu.com", headers=headers) print(res.cookies) # 调用items()方法转化为元祖组成的列表，遍历输出每一个cookie for key, value in res.cookies.items(): print(key + "=" + value) """ # 类型RequestsCookieJar <RequestsCookieJar[<Cookie BAIDUID=CE10743D4DCCA7E8EAE505F60EBD3992:FG=1 for .baidu.com/>, <Cookie BIDUPSID=CE10743D4DCCA7E8EAE505F60EBD3992 for .baidu.com/>, <Cookie H_PS_PSSID=26523_1450_21091_28206_28132_27750_28140_27508 for .baidu.com/>, <Cookie PSTM=1546168944 for .baidu.com/>, <Cookie delPer=0 for .baidu.com/>, <Cookie BDSVRTM=0 for www.baidu.com/>, <Cookie BD_HOME=0 for www.baidu.com/>]> BAIDUID=CE10743D4DCCA7E8EAE505F60EBD3992:FG=1 BIDUPSID=CE10743D4DCCA7E8EAE505F60EBD3992 H_PS_PSSID=26523_1450_21091_28206_28132_27750_28140_27508 PSTM=1546168944 delPer=0 BDSVRTM=0 BD_HOME=0 """ """requests库利用cookies请求知乎的两种方式""" import requests from requests.cookies import RequestsCookieJar """ # 常用 headers = { "cookie": 'q_c1=c5dafb4029a94bd28bab31916755a82a|1546093256000|1546093256000; r_cap_id="NzJjY2ViMWQ2MWQ2NGNmYmE5ZjJjYjA4MmI4OTlmYjM=|1546093256|4fdca7ef25aee38df8b6895fe0e6870b6c4157d7"; cap_id="NTIxY2Q0NWY2NGYzNDMwYjhmZWJiNzkxY2YxNzMxNTE=|1546093256|98ea49da057eacfa5979f20ebc86610106421e92"; l_cap_id="M2JlYTFhZmQzOWRjNDE1NzhmM2VjYjA2YWFmNGViNzI=|1546093256|321a5802717da27fc618ba74eb0dcb928d037974"; d_c0="AODhnmWpvg6PTmDEXzC_5yO9xS5KsJL3g1c=|1546093259"; _xsrf=T3PdhoFZCjirABeT1olJ9o2Ju1WH5PQP; _zap=492572c4-fbf2-48d2-9ac9-ec7ee95a9154; tgw_l7_route=931b604f0432b1e60014973b6cd4c7bc; capsion_ticket="2|1:0|10:1546169369|14:capsion_ticket|44:MWJhZDk3YTYxYTA5NDkxZjhlYWUwODRlNDliY2Y4Mjc=|a303a846033bf574b0bdd3677218f5bb49a56b00890aa86a7a9b0ac7c6b53985"; z_c0="2|1:0|10:1546169409|4:z_c0|92:Mi4xVEljZkJBQUFBQUFBNE9HZVphbS1EaVlBQUFCZ0FsVk5RZm9WWFFCdTAxTV94cHpiQ0xUV2dBRC16RmpacE4xZXp3|e24885ab0706d33abc6e7f45f2eb74769d88bc15366d945d57366efe8f5856a0"; unlock_ticket="AJBCprKETQsmAAAAYAJVTUmzKFwvSS6hhmi4BuDGUgm1G6fZBYhVXw=="; tst=r', "User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3554.0 Safari/537.36" } res = requests.get("https://www.zhihu.com", headers=headers) print(res.text) """ # 比较繁琐 cookies = 'q_c1=c5dafb4029a94bd28bab31916755a82a|1546093256000|1546093256000; r_cap_id="NzJjY2ViMWQ2MWQ2NGNmYmE5ZjJjYjA4MmI4OTlmYjM=|1546093256|4fdca7ef25aee38df8b6895fe0e6870b6c4157d7"; cap_id="NTIxY2Q0NWY2NGYzNDMwYjhmZWJiNzkxY2YxNzMxNTE=|1546093256|98ea49da057eacfa5979f20ebc86610106421e92"; l_cap_id="M2JlYTFhZmQzOWRjNDE1NzhmM2VjYjA2YWFmNGViNzI=|1546093256|321a5802717da27fc618ba74eb0dcb928d037974"; d_c0="AODhnmWpvg6PTmDEXzC_5yO9xS5KsJL3g1c=|1546093259"; _xsrf=T3PdhoFZCjirABeT1olJ9o2Ju1WH5PQP; _zap=492572c4-fbf2-48d2-9ac9-ec7ee95a9154; tgw_l7_route=931b604f0432b1e60014973b6cd4c7bc; capsion_ticket="2|1:0|10:1546169369|14:capsion_ticket|44:MWJhZDk3YTYxYTA5NDkxZjhlYWUwODRlNDliY2Y4Mjc=|a303a846033bf574b0bdd3677218f5bb49a56b00890aa86a7a9b0ac7c6b53985"; z_c0="2|1:0|10:1546169409|4:z_c0|92:Mi4xVEljZkJBQUFBQUFBNE9HZVphbS1EaVlBQUFCZ0FsVk5RZm9WWFFCdTAxTV94cHpiQ0xUV2dBRC16RmpacE4xZXp3|e24885ab0706d33abc6e7f45f2eb74769d88bc15366d945d57366efe8f5856a0"; unlock_ticket="AJBCprKETQsmAAAAYAJVTUmzKFwvSS6hhmi4BuDGUgm1G6fZBYhVXw=="; tst=r' jar = requests.cookies.RequestsCookieJar() # 生成请求的cookies实例jar headers = { "User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3554.0 Safari/537.36" } for cookie in cookies.split(";"): print(type(cookie)) # 类型str key, value = cookie.split("=", 1) # 变量循环接收值，需指定每一次接收的数量，在这里是1个 jar.set(key, value) # 在jar实例中设置cookies # 携带cookies和headers发起请求 res = requests.get("https://www.zhihu.com", cookies=jar, headers=headers) print(res.text)
5.简单的实战作用
"""requests配合re正则实战解析""" import requests import re headers={"user-agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3554.0 Safari/537.36"} url = "https://www.zhihu.com/explore" # 获取响应的数据 res = requests.get(url=url, headers=headers) # 正则字符串编译成正则表达式对象，.*?是非贪婪模式匹配，匹配的字符串越短越好，re.S使.匹配换行符在内的所有字符 content_tag = re.compile("explore-feed.*?question_link.*?>(.*?)</a>", re.S) # 获取匹配的字符串信息 title = re.findall(content_tag, res.text) print(title)
6.代理设置
"""requests的代理设置proxies和socks。同理可以添加超时设置timeout， 因为请求分为连接和读取，也可以接收一个元祖传参数。此外还可以做登陆认证， 直接使用auth认证。 """ import requests # 基本的Http代理 proxies = { "http": "http://user:[email protected]:3780" } res = requests.get("https://www.taobao.com", proxies=proxies, timeout=1, auth=("username", "password")) print(res.text) # socks协议的代理 proxies1 = { "https": "socks5://user:password@host:port" } ren = requests.get("https://www.taobao.com", proxies=proxies1, timeout=(1, 2, 3)) print(ren.text)
7.会话维持
"""requests当中的session会话维持""" import requests # 生成会话对象 ses = requests.Session() # 用会话对象请求url并设置cookies ses.get("http://httpbin.org/cookies/set/number/1234") # 再次使用会话对象获取已设置的cookies信息 res = ses.get("http://httpbin.org/cookies") print(res.text)