Python爬取搜索引擎结果数目

#coding:utf-8
import urllib
import urllib2
import re
import sys
import socket
import time

print "Start of work"  
filename = "keywords.txt"  #关键词文件
fid = open(filename,'r')
all_text = fid.readlines()
NumOutput = open(r'searchnumber.txt','w+')

socket.setdefaulttimeout(6) #设置6s延时

for eachtext in all_text:
    eachtext = eachtext.strip('\n')
    print eachtext
    DataOutput = open(r'searchdata.txt','w+')

    flag = 1 #设置标志
    while (flag):
        try:
            response = urllib2.urlopen("http://www.baidu.com/s?"+urllib.urlencode({'wd': eachtext})+"&pn={0}&cl=3&rn=100")
            html = response.read()
            flag = 0
        except socket.error:
            errno, errstr = sys.exc_info()[:2]
            if errno == socket.timeout:
                print "The