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淘宝商品比价定向爬虫
功能描述：
1、目标：获取淘宝搜索页面的信息，提取其中的商品名称和价格
2、理解：淘宝的搜索接口，翻页处理
技术路线：requests + re
程序的结构设计：
1、提交商品搜索的请求，循环获取页面。
2、对于每个页面，提取商品名称和价格信息。
3、将信息输出到屏幕上。
重要：在淘宝获取页面时，淘宝设置了登录验证才能访问，此时在requests请求时，需要设置cookies和user-agent。
我要评论import requests
import re
def gethtmltext(url,kv,cookies):
try:
r=requests.get(url,headers = kv,cookies = cookies,timeout = 30)
r.raise_for_status()
r.encoding = r.apparent_encoding
return r.text
except:
return ""
def parsepage(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(plt[i].split(':')[1])
title = eval(tlt[i].split(':')[1])
ilt.append([price,title])
except:
print("")
def printgoodlist(ilt):
tplt = "{:4}\t{:8}\t{:16}"
print(tplt.format("序号","价格","商品名称"))
count = 0
for g in ilt:
count = count +1
print(tplt.format(count,g[0],g[1]))
def main():
goods = '书包'
depth = 3
start_url = 'https://s.taobao.com/search?&q=' + goods
coo = 'thw=cn; t=254ecf83ad9b49c70d383c71e214fab2;cna=kbbgffo2du8caxfzkr/6/wq5; tg=0;enc=xwabwic%2bqzfhpca6p6g4cz34emasvk3ljzrst%2fkmfk5ja31%2bmjmxgvbdj%2b82q2pjlj83duh5lbpaw%2bpi53l4%2bq%3d%3d; hng=cn%7czh-cn%7ccny%7c156; x=e%3d1%26p%3d*%26s%3d0%26c%3d0%26f%3d0%26g%3d0%26t%3d0; tracknick=xxp158125132; lgc=xxp158125132; _cc_=urm48syizq%3d%3d; uc3=vt3=f8dbyr1tom%2bgeylp6re%3d&id2=vweyzoanisao&nk2=g5htj%2bhk8f8st03j&lg2=w5ihllyfogw7aa%3d%3d; mt=ci=94_1; v=0; cookie2=1794e2e0aad3f137168e0a64b250dced; _tb_token_=e33e0373befbe; isg=betlnz2ukxogtcghre2manjz2u8_4f80dj1myl1ijwrh3gs-rbdvsul6spyxj7da'
cookies = {}
for line in coo.split(';'):
name,value=line.strip().split('=',1)
cookies[name]=value
kv = {'user-agent':'mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, like gecko) chrome/70.0.3538.67 safari/537.36'}
infolist = []
for i in range(depth):
try:
url = start_url+'&s=' + str(44*i)
html = gethtmltext(url,kv,cookies)
parsepage(infolist,html)
except:
continue
printgoodslist(infolist)
main()
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