新手查天气代码到底哪一步错了？

zhaojunri1020

import urllib2
import json
a=open('city.txt')
lines=a.readlines()
a.close()
cityname=raw_input('你想查那个城市的天气？\n')
kk=''
kk+=cityname
print kk
for line in lines:
    try:
        name=line.split(':')[0]
        if name=='kk':
            code=line.split(':')[1]
            print code
            break
    except:
        print 'error'
try:
    url=('http://www.weather.com.cn/data/cityinfo/%s.html'%code)
    content = urllib2.urlopen(url).read()
    data = json.loads(content)
    result = data['weatherinfo']
    str_temp = ('%s\n%s ~ %s') % ( result['weather'],
    result['temp1'],result['temp2'])
    print str_temp
except:
    print'失败'