python 爬取天气温度

#!/usr/bin/env python
# encoding: utf-8
import re
import requests
#定义访问地址列表，因为地址没有通配匹配所以没办法写正则
url = [
'http://chengdu.tianqi.com/',
'http://chengdu.tianqi.com/chongzhou/',
'http://chengdu.tianqi.com/dayi/',
'http://chengdu.tianqi.com/dujiangyan/',
'http://chengdu.tianqi.com/jintang/',
'http://chengdu.tianqi.com/longquanyi/',
'http://chengdu.tianqi.com/pixian/',
'http://chengdu.tianqi.com/pujiang1/',
'http://chengdu.tianqi.com/pengzhou/',
'http://chengdu.tianqi.com/qionglai/',
'http://chengdu.tianqi.com/shuangliu/',
'http://chengdu.tianqi.com/wenjiang/',
'http://chengdu.tianqi.com/xindu/',
'http://chengdu.tianqi.com/xinjin/',
]
#循环访问地址
for html in url:
html=requests.get(html)
detail = html.content.decode('gbk').encode('utf-8')
detail1 = re.findall('<div id="rettemp">(.*?)</div>',detail,re.S)
temper = re.findall('<strong>(.*?)</strong>',str(detail1),re.S)
content = temper[0].replace('°','°')
cityall = re.findall('<div class="temp">(.*?)<div class="weatherDiv1">',detail,re.S)
city = []
for i in cityall:
city = re.findall('<h3>(.*?)</h3>',i,re.S)
for i in city:
print i + ':' + content
a = i + ':' + content + '\n'
with open('temperature.txt','a+') as obj:
obj.write(a)
with open('temperature.txt','a+') as obj:
obj.write('==================' + '\n')

说明:
<div class="temp">
<h3>成都当前温度</h3>
<div class="weatherDiv1">
<div class="numN"> 50-<br>
25-<br>
0-<br>
-25-<br>
-50- </div>
<p class="bg_sk" style="height:37px" id="rethigh"></p>
<div id="rettemp"><strong>9.6°</strong><span>相对湿度：99%</span></div>
<div class="tq24_1"><a href="http://chengdu.tianqi.com/today/" target="_blank">24小时天气预报</a></div>
</div>
</div>

detail1 = re.findall('<div id="rettemp">(.*?)</div>',detail,re.S)
<div id="rettemp"><strong>9.6°</strong><span>相对湿度：99%</span></div>
<div class="tq24_1"><a href="http://chengdu.tianqi.com/today/" target="_blank">24小时天气预报
7fe0
</a></div>
</div>

temper = re.findall('<strong>(.*?)</strong>',str(detail1),re.S)
<strong>9.6°</strong>
运行结果:
成都当前温度:9.6°
崇州当前温度:9.9°
大邑当前温度:11.8°
都江堰当前温度:8.9°
金堂当前温度:9.9°
龙泉驿当前温度:9.6°
郫县当前温度:9.9°
蒲江当前温度:9.6°
彭州当前温度:9.7°
邛崃当前温度:11.7°
双流当前温度:10.2°
温江当前温度:10.8°
新都当前温度:9.8°
新津当前温度:10.5°
并会把结果存放到temperature.txt中