爬取北京房子信息与图片保存文件夹

#encoding:utf8
import requests
from lxml import etree
import re
import hashlib
#random定义任意随机数
import random
import time
yuan = requests.get('http://esf.fang.com/').text
demo = etree.HTML(yuan).xpath('//*/dd')
demo1 = etree.HTML(yuan).xpath('//*/dt/a/img/@onerror')
for i in demo1:
    z = re.compile("imgiserror\(this,\'(.*?)\'\)",re.S)
    yuan1 = requests.get(z.findall(i)[0]).content
    # h = hashlib.new("md5")
    # h.update(z.findall(i)[0].encode('utf8'))
    # zhi = h.hexdigest()
#以上三行注释可以和定义的任意随机数互换
#定义任意随机数
    zhi = str(random.choice(range(1,10000000000000)))+str(time.time())
    op = open('F:\\10\\bsbs\\mai\\'+zhi+'.jpg','wb')
    op.write(yuan1)
    print(z.findall(i)[0])
for i in demo:
        a =i.xpath('p[1]/a/text()')
        b = i.xpath('p[2]/text()')
        c = i.xpath('p[3]/a/span/text()')
        d = i.xpath('p[4]/a/text()')
        if a and b and c and d:
            str = ''
            for i in range(len(b)):
                str+=b[i].strip()+'|'
            print(a[0],str.strip('|'),c[0],d[0])