python 抓取 1688商品详情

写的还是不完善，抓取的价格还稳定，还有详情现在无法抓到

#!/usr/bin/python
import threading
from time import ctime,sleep
import pycurl
import urllib2
import sys,os
import StringIO
from lxml import etree
import datetime
starttime = datetime.datetime.now()
#https pycurl

def spider_curl(url):
    c = pycurl.Curl()
    c.setopt(pycurl.URL, url)
    b = StringIO.StringIO()
    c.setopt(pycurl.WRITEFUNCTION, b.write)
    c.setopt(pycurl.SSL_VERIFYPEER, 0)
    c.setopt(pycurl.SSL_VERIFYHOST, 0)
    c.perform()
    html = b.getvalue()
    #print html
    show_pach( html,url)

def show_pach(html,url):
    tree=etree.HTML(html)
    nodes=tree.xpath(u"/html/body")
    title=nodes[0].xpath("//title")
    attach_thumb = nodes[0].xpath('//li[@data-imgs]')
    sale = nodes[0].xpath('//span[@class="value"][2]');
    
    img_s = ""
    cover = ""
    cost = ""
    sale_price = ""
    market_price = ""
    shop_price = 100 #库存
    #print sale[5]
    
    for items in sale:
        cost = items.text
        
    sale_price = float(cost) * 1.4
    market_price = float(cost) * 1.8
        
    j = 0
    for item in attach_thumb:
       
            imgs = item.attrib['data-imgs']
            dict = eval(item.attrib['data-imgs'])
            if j == 1:
                cover = str(dict["preview"])

            #print dict["preview"]
            img_s = img_s + str(dict["preview"])+","
            j = j + 1
            if j == 5:
                break

    for item in title:
         title = item.text[:-11]

    print title +"\n"
    print cover +"\n"
    print img_s[:-1] +"\n"
    
    sql = "INSERT INTO `wpin`.`yge_product` ( `title`, `category_id`, `attach_thumb`,`attach_image`,`slider`,`sale_price`,`market_price`,`shop_price`,`chengben`, `content`) VALUES ('"+ title +"','163','"+ cover +"','"+ cover +"','"+ img_s[:-1] +"','"+ str(sale_price) +"','"+ str(market_price) +"','"+ str(shop_price) +"','"+ str(cost) +"','content')"
    print sql

    
    
    
def download_img_https(url):
    c = pycurl.Curl()
    c.setopt(pycurl.URL, url)
    b = StringIO.StringIO()
    c.setopt(pycurl.WRITEFUNCTION, b.write)
    c.setopt(pycurl.SSL_VERIFYPEER, 0)
    c.setopt(pycurl.SSL_VERIFYHOST, 0)
    c.perform()
    html = b.getvalue()
    #print html
    ms=hashlib.md5()
    ms.update(url)
    ms.hexdigest()
    fk = open("file/nimabi"+ms.hexdigest()+".jpg", "wb")
    fk.write(html)
    print url
    fk.close()
    
def urllibget(i):
    response = urllib2.urlopen(i) 
    html = response.read()
    show_pach(html,i)
    
def run():
    url = raw_input("add one url: ")
    if url[:4] != 'http':
           print "please a true 1688 detail url "
    else:
        urllibget(url)

run()
endtime = datetime.datetime.now()
print (endtime - starttime).seconds