Python小爬虫实例

# -*- coding: utf-8 -*-
# func passport jw.qdu.edu.cn
import re
import urllib
# python3后urllib.request代替urllib2
import urllib.request
import json
from bs4 import BeautifulSoup

class taofen:

def getHtml(self , pageurl):
# 获取网站html代码
req = urllib.request.Request(pageurl , headers = {
'Connection': 'Keep-Alive',
'Accept': 'text/html, application/xhtml+xml, */*',
'Accept-Language': 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3',
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko'
})
_respose = urllib.request.urlopen(req , timeout = 2)
try:
html = _respose.read().decode('UTF-8').replace(' ','')
except Exception as e:
pass
return html
def getKind(self , html):
soup = BeautifulSoup(html , "html.parser")
liList = soup.find_all('li')
res = []
for li in liList:
if li.img and li.find(class_ = "change_price"):
img = li.img.attrs['original']
name = li.img.attrs['alt']
price = li.find(class_ = "change_price").string
resNode = {'img':img,'name':name,'price':price}
res.append(resNode)
return res

if __name__ == "__main__":

taofen = taofen()
html = taofen.getHtml("http://www.taofen8.com/promcat-4/cat-300/subcat-0/page-1/order-3/sp-2")

res = taofen.getKind(html)
#ensure_ascii=False将utf-8编码的中文正确显示
res = json.dumps(res , ensure_ascii = False)
print(res)