python定向爬取淘宝商品价格

python爬虫学习之定向爬取淘宝商品价格，供大家参考，具体内容如下

import requests
import re

def getHTMLText(url):
  try:
    r = requests.get(url, timeout=30)
    r.raise_for_status() #如果发送了一个失败请求(非200响应),#我们可以通过 Response.raise_for_status() 来抛出异常:
    r.encoding= r.apparent_encoding
    return r.text
  except:
    return ""

def parsePage(ilt,html):
  try:
    plt = re.findall(r'\"view_price\"\:\"[\d\.]*?\"',html) #正则表达式来匹配 "view_price":"\d\."类型的字符串
    tlt = re.findall(r'\"raw_title\"\:\".*?\"',html)
#正则表达式来匹配 "raw_title":".*?"类型的字符串,.*?是任意字符的最小匹配
    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 PrintGoodsList(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 = 2
  start_url = 'https://s.taobao.com/search?q=' + goods
  infoList=[]
  for i in range(depth):
    try:
      url = start_url + '&s=' + str(44*i)
      html= getHTMLText(url)
      parsePage(infoList,html)
    except:
      continue

  PrintGoodsList(infoList)

main()