Python小爬虫实例

有几个注意点：

# -*- coding: utf-8 -*-
# func passport jw.qdu.edu.cn
import re
import urllib
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(‘&nbsp‘,‘‘)
        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)