python解析中国天气网的天气数据

python weather.py http://www.weather.com.cn/weather/101010100.shtml

#coding=utf-8 
#weather.py 
import urllib 
import re 
import simplejson 
import sys 

if len(sys.argv) != 2: 
    print 'please enter: python ' + sys.argv[0] + '  <url>' 
    exit(0)  
url = sys.argv[1]; 
def readurlPageContent(url):#获取页面的所有数据 逐行读取 
    webpage = urllib.urlopen(url); 
    line = webpage.readline(); 
    data = '' 
    while line: 
        data = data + line.strip(); #去除每行两边的的空格 
        line = webpage.readline();  
    return data 

def getDatabody(data): 
    reg = re.compile(r'(<div class=\"weatherYubaoBox\">(?:(?!<div)(?!</div).)*</div>)'); 
    matchs = reg.findall(data,re.I); 
    if len(matchs) > 0: 
        return matchs[0] 
    return None 

def getSixDayWeather(data): 
    regs = re.compile(r'>((?:(?!<)(?!>)(?!var).)+)<'); 
    datas = regs.findall(data) 
    if len(datas) > 12: 
        datas = datas[12:len(datas)-7];#提取其中的78项 即后面6天的天气数据 每天相关的信息有13个 

        return datas     
    return None 

 
data = readurlPageContent(url); 
match_data = getDatabody(data) 
if match_data == None : 
    print 'get weather data fail' 
    exit(0) 

weathers_data = getSixDayWeather(match_data) 
if weathers_data == None: 
    print 'get six day info fail' 
    exit(0) 

count = len(weathers_data); 
groups_item_count = count / 6; 
weathers = {}; 
groups = []; 

start = 0 
for item in weathers_data : 
    if (start % groups_item_count) == 0: 
        groups = []; 
        weathers[('day'+str(start/groups_item_count + 1))] = groups; 

    groups.append(item) 
    start = start + 1 

 
print simplejson.dumps(weathers, encoding='UTF-8', ensure_ascii=False) 

    cd D:/simplejson