Python采集网页数据保存到excel

import urllib
from xlwt import Workbook
import datetime
def FetchData():
book = Workbook(encoding='gbk')    #如果采集数据有中文，需要添加这个
sheet1 = book.add_sheet('Sheet 2') #表格缓存
i = 0
theday = datetime.date(2009,12,31)
while i < 100: #这边的场景就是采集100个网页，每个网址都包含日期
i += 1
theday = theday + datetime.timedelta(days = 1)
print theday
theday_str = str(theday)
sheet1.write(i,0,theday_str)  #写表格
check_url = r'http://www.xxx.com/index?date=' + theday_str #网页地址
try:
checkfile = urllib.urlopen(check_url)  #网页保存为文本文件
except Exception,e:
print e
return
type = sys.getfilesystemencoding()
for line in checkfile:
line = line.decode("UTF-8").encode(type)     #网页编码为UTF-8
date_west = getdata('date_west', line)       #获取特定数据
if date_west != False:
sheet1.write(i,1,date_west)
book.save('simple.xls')  #保存excel文件
print 'finish!'
'if keywords in the line, get data from > to </'
def getdata(keywords, line):
data = ''
if keywords in line:
start = line.find('>',)
end = line.find('</', start)
data = line[start+1:end]
return data
return False