Python requests模块学习笔记

一、Requests模块说明

Requests 是使用 Apache2 Licensed 许可证的 HTTP 库。用 Python 编写,真正的为人类着想。html

Python 标准库中的 urllib2 模块提供了你所须要的大多数 HTTP 功能,可是它的 API 太渣了。它是为另外一个时代、另外一个互联网所建立的。它须要巨量的工做,甚至包括各类方法覆盖,来完成最简单的任务。python

在Python的世界里,事情不该该这么麻烦。git

Requests 使用的是 urllib3,所以继承了它的全部特性。Requests 支持 HTTP 链接保持和链接池,支持使用 cookie 保持会话,支持文件上传,支持自动肯定响应内容的编码,支持国际化的 URL 和 POST 数据自动编码。现代、国际化、人性化。github

(以上转自Requests官方文档)web

二、Requests模块安装

而后执行安装apache

python setup.py install

我的推荐使用pip安装json

pip install requests

也可使用easy_install安装cookie

easy_install requests

尝试在IDE中import requests,若是没有报错,那么安装成功。app

三、Requests模块简单入门

#HTTP请求类型
#get类型
r = requests.get('https://github.com/timeline.json')
#post类型
r = requests.post("http://m.ctrip.com/post")
#put类型
r = requests.put("http://m.ctrip.com/put")
#delete类型
r = requests.delete("http://m.ctrip.com/delete")
#head类型
r = requests.head("http://m.ctrip.com/head")
#options类型
r = requests.options("http://m.ctrip.com/get")

#获取响应内容
print r.content #以字节的方式去显示,中文显示为字符
print r.text #以文本的方式去显示

#URL传递参数
payload = {'keyword': '日本', 'salecityid': '2'}
r = requests.get("http://m.ctrip.com/webapp/tourvisa/visa_list", params=payload) 
print r.url #示例为http://m.ctrip.com/webapp/tourvisa/visa_list?salecityid=2&keyword=日本

#获取/修改网页编码
r = requests.get('https://github.com/timeline.json')
print r.encoding
r.encoding = 'utf-8'

#json处理
r = requests.get('https://github.com/timeline.json')
print r.json() #须要先import json    

#定制请求头
url = 'http://m.ctrip.com'
headers = {'User-Agent' : 'Mozilla/5.0 (Linux; Android 4.2.1; en-us; Nexus 4 Build/JOP40D) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19'}
r = requests.post(url, headers=headers)
print r.request.headers

#复杂post请求
url = 'http://m.ctrip.com'
payload = {'some': 'data'}
r = requests.post(url, data=json.dumps(payload)) #若是传递的payload是string而不是dict,须要先调用dumps方法格式化一下

#post多部分编码文件
url = 'http://m.ctrip.com'
files = {'file': open('report.xls', 'rb')}
r = requests.post(url, files=files)

#响应状态码
r = requests.get('http://m.ctrip.com')
print r.status_code
    
#响应头
r = requests.get('http://m.ctrip.com')
print r.headers
print r.headers['Content-Type']
print r.headers.get('content-type') #访问响应头部份内容的两种方式
    
#Cookies
url = 'http://example.com/some/cookie/setting/url'
r = requests.get(url)
r.cookies['example_cookie_name']    #读取cookies
    
url = 'http://m.ctrip.com/cookies'
cookies = dict(cookies_are='working')
r = requests.get(url, cookies=cookies) #发送cookies

#设置超时时间
r = requests.get('http://m.ctrip.com', timeout=0.001)

#设置访问代理
proxies = {
           "http": "http://10.10.10.10:8888",
           "https": "http://10.10.10.100:4444",
          }
r = requests.get('http://m.ctrip.com', proxies=proxies)

四、Requests示例

json请求webapp

#!/user/bin/env python
#coding=utf-8
import requests
import json

class url_request():
    def __init__(self):
            """ init """    

if __name__=='__main__':
    headers = {'Content-Type' : 'application/json'}
    payload = {'CountryName':'中国',
               'ProvinceName':'陕西省',
               'L1CityName':'汉中',
               'L2CityName':'城固',
               'TownName':'',
               'Longitude':'107.33393',
               'Latitude':'33.157131',
               'Language':'CN'
               }
    r = requests.post("http://www.xxxxxx.com/CityLocation/json/LBSLocateCity",headers=headers,data=payload)
    #r.encoding = 'utf-8'
    data=r.json()
    if r.status_code!=200:
        print "LBSLocateCity API Error " + str(r.status_code)
    print data['CityEntities'][0]['CityID'] #打印返回json中的某个key的value
    print data['ResponseStatus']['Ack']
    print json.dumps(data,indent=4,sort_keys=True,ensure_ascii=False) #树形打印json,ensure_ascii必须设为False不然中文会显示为unicode

xml请求

#!/user/bin/env python
#coding=utf-8
import requests

class url_request():
    def __init__(self):
            """ init """    

if __name__=='__main__':
    
    headers = {'Content-type': 'text/xml'}
    XML = '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><Request xmlns="http://tempuri.org/"><jme><JobClassFullName>WeChatJSTicket.JobWS.Job.JobRefreshTicket,WeChatJSTicket.JobWS</JobClassFullName><Action>RUN</Action><Param>1</Param><HostIP>127.0.0.1</HostIP><JobInfo>1</JobInfo><NeedParallel>false</NeedParallel></jme></Request></soap:Body></soap:Envelope>'
    url = 'http://jobws.push.mobile.xxxxxxxx.com/RefreshWeiXInTokenJob/RefreshService.asmx'
    r = requests.post(url,headers=headers,data=XML)
    #r.encoding = 'utf-8'
    data = r.text
    print data

五、参考文档

http://cn.python-requests.org/en/latest/

http://docs.python-requests.org/en/latest/user/quickstart.html