Python网络爬虫信息提取mooc代码实例

实例一--爬取页面

import requests
url="https//itemjd.com/2646846.html"
try:
r=requests.get(url)
r.raise_for_status()
r.encoding=r.apparent_encoding
print(r.text[:1000])
except:
print("爬取失败")

正常页面爬取

实例二--爬取页面

import requests
url="https://www.amazon.cn/gp/product/B01M8L5Z3Y"
try:
kv={'user-agent':'Mozilla/5.0'}
r=requests.get(url,headers=kv)
r.raise_for_status()
r.encoding=r.apparent_encoding
print(r.text[1000:2000])
except:
print("爬取失败")

对访问用户名有限制，模拟浏览器对网站请求

实例三--爬取搜索引擎

#百度的关键词接口：http://www.baidu.com/s?wd=keyword
#360的关键词接口：http://www.so.com/s?q=keyword
import requests
keyword="python"
try:
kv={'wd':keyword}
r=requests.get("http://www.baidu.com/s",params=kv)
print(r.request.url)
r.raise_for_status()
print(len(r.text))
except:
print("爬取失败")
--------------------------------------------------
import requests
keyword="python"
try:
kv={'q':keyword}
r=requests.get("http://www.so.com/s",params=kv)
print(r.request.url)
r.raise_for_status()
print(len(r.text))
except:
print("爬取失败")

实例四--:爬取图片

import requests
import os
url="http://image.nationalgeographic.com.cn/2017/0211/20170211061910157.jpg"
root="F://pics//"
path=root+url.split('/')[-1]
try:
if not os.path.exists(root):
 os.mkdir(root)
if not os.path.exists(path):
 r=requests.get(url)
 with open(path,'wb') as f:
  f.write(r.content)
  f.close()
  print("文件保存成功")
else:
 print("文件已经存在")
except:
print("爬取失败")

爬取并保存图片

实例五--IP地址归属地查询：

http://m.ip138.com/ip.asp?ip=ipaddress

url="http://www.ip138.com/iplookup.asp?ip="
try:
r=requests.get(url+'202.204.80.112'+'&action=2')
r.raise_for_status()
r.encoding=r.apparent_encoding
print(r.text[-500:])
except:
print("爬取失败")

来源：https://www.cnblogs.com/cy2268540857/p/12424091.html