weixin_43436453
weixin_43436453
2019-03-10 18:49

爬虫中正则表达式问题

  • python
  • 正则表达式

爬取淘宝网页的商品价格信息 ,但是没有获取到商品信息,应该是正则表达式有问题,但是我不知道问题在哪……

import requests
import re
#访问并获取网页
def getHtmlText(url):
    try :
        r = request.get(url,timeout = 30)
        r.raise_for_status()
        r.encoding = r.apparent_encoding
        return r.text
    except:
        return ""
#解析网页,获取信息
def parserPage(ilt,html):
    try:
        plt = re.findall(r'\"view_price\"\:\"\d*\"',html)
        tlt = re.findall(r'\"raw_title\"\:\".*?\"',html)
        for i in range(len(plt)):
            price = eval(pat[i].split(':')[1])
            title = eval(tlt[i].split(':')[1])
            ilt.append([price,title])
    except:
        return 0
#打印信息
def printGoodList(lit):
    tplt = "{:4}\t{:8}\t{:16}"
    print(tplt.format("序号","价格","商品名称"))
    count = 0
    for g in lit:
        count = count + 1
        print(tplt.format(count,g[0],g[1]))

#主函数
def main():
    goods = '书包'
        #爬取网页的页数
    depth = 2  
    start_url = "https://s.taobao.com/search?q=" + goods
    infoList = []
    for i in range (depth):
        try :
            url = start_url + '&s='+ str(44*i)  
                        #页数标码为44,加44代表进下页
            html = getHtmlText(url)
            parsePage(infoList,html)
        except:
            continue

    printGoodList(infoList)


main()

小白求指点,谢谢

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