爬虫－python调用百度API／requests

from urllib.request import urlopen

import requests
import json

url = "http://apis.baidu.com/txapi/mvtp/meinv"         #API
req = requests.get(url)         #request.get(url,param=param,headers = headers)
headers= {'apikey':'自己的apikey'}  #自己的apikey
params = {'num':'5'}                                    #请求参数(urlParam) :
r = requests.get(url,params=params,headers=headers)
print(r)

print(r)
def SaveImage(ImageUrl,ImgName= 'default.jpg'):
    response = requests.get(ImageUrl,stream = True)
    image = response.content

    dst = '/Users/Alan/desktop/BaiDUImages/' #路径
    path  = dst+ImgName
    print('Save the file:',path)
    with open(path,'wb') as img:
        img.write(image)
def run():
    for line in r['newslist']:
        title = line['title']
        picUrl = line['picUrl']
        SaveImage(picUrl,ImgName=title+'.jpg')
run()

第二课：

#!/usr/bin/env python3
#antuor:Alan
import requests
import re
headers = {'User-Agent':'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36'}
#审查元素 ，network 里的request headers,复制过来，变成字典形式
url = 'http://www.cnblogs.com/wupeiqi/articles/4938499.html'

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

title = re.findall('href="(.*?)</a>',html.text)   #查找所有以href="开头＋</a>结尾的内容
for i in title:
　　print(i)

输入结果：

http://www.cnblogs.com/wupeiqi/">Mr.Seven
http://www.cnblogs.com/">博客园
http://www.cnblogs.com/wupeiqi/">首页
http://i.cnblogs.com/EditPosts.aspx?opt=1">新随笔
http://msg.cnblogs.com/send/%E6%AD%A6%E6%B2%9B%E9%BD%90">联系
http://www.cnblogs.com/wupeiqi/rss">订阅
http://www.cnblogs.com/wupeiqi/rss"><img src="http://www.cnblogs.com/images/xml.gif" alt="订阅" />
http://i.cnblogs.com/">管理
http://www.cnblogs.com/wupeiqi/articles/4938499.html">Python之路【目录】
http://www.cnblogs.com/wupeiqi/articles/4906230.html">Python之路【第一篇】：Python简介和入门
http://www.cnblogs.com/wupeiqi/articles/4911365.html">Python之路【第二篇】：Python基础（一）
http://www.cnblogs.com/wupeiqi/articles/4943406.html">Python之路【第三篇】：Python基础（二）
http://www.cnblogs.com/wupeiqi/articles/4963027.html">Python之路【第四篇】：模块
http://www.cnblogs.com/wupeiqi/articles/5017742.html">Python之路【第五篇】：面向对象及相关
http://www.cnblogs.com/wupeiqi/articles/5040823.html" target="_blank">Python之路【第六篇】：Socket
http://www.cnblogs.com/wupeiqi/articles/5040827.html" target="_blank">Python之路【第七篇】：线程、进程和协程
http://www.cnblogs.com/wupeiqi/articles/5095821.html">Python之路【第八篇】：堡垒机实例以及数据库操作
http://www.cnblogs.com/wupeiqi/articles/5132791.html" target="_blank">Python之路【第九篇】：Python操作 RabbitMQ、Redis、Memcache、SQLAlchemy
http://www.cnblogs.com/wupeiqi/articles/5237672.html" target="_blank">Python之路【第十五篇】：Web框架
http://www.cnblogs.com/wupeiqi/articles/5237704.html" target="_blank">Python之路【第十六篇】：Django【基础篇】
http://www.cnblogs.com/wupeiqi/articles/5246483.html" target="_blank">Python之路【第十七篇】：Django【进阶篇】
http://www.cnblogs.com/wupeiqi/articles/5341480.html" target="_blank">Python之路【第十八篇】：Web框架们
http://www.cnblogs.com/wupeiqi/articles/4949995.html" target="_blank">计算器源码
http://www.cnblogs.com/wupeiqi/articles/4980620.html" target="_blank">装饰器
http://i.cnblogs.com/EditArticles.aspx?postid=4938499" rel="nofollow">编辑
#" onclick="AddToWz(4938499);return false;">收藏

第三课：对异步加载的网页，可以用post向提交数据

#!/usr/bin/env python3
#antuor:Alan
import requests
import re

url = 'http://www.crowdfunder.com/browse/deals'

data = {
    'entities_only':'true',  #是字符串，不是布尔值
    'page':'1'                ＃是字符串1，不是数字

}

html = requests.post(url,data=data)  ＃用post方法，不用get
title = re.findall('"card-title">(.*?)</div>',html.text)
for each in title:
    print(each)