#encoding=utf-8

import urllib

import re

import os

#获取网络数据到指定文件

def getHtml(url,fname):

    #fname = 'C:\\Users\cuiliting\\Desktop\\weather_forecast.txt'

    data =[]

    page = urllib.urlopen(url)

    html = page.read()

    data.append(html)

    fobj = open(fname,'w')

    fobj.writelines('%s' %x for x in data)

    fobj.close()

    page.close()  

#从文件获取得到所需数据

def getWeather(fname,weath_keyword):

    fobj = open(fname,'r')

    for eachline in fobj:

        if weath_keyword in eachline:

            print eachline,

    fobj.close()  

if __name__ == '__main__':

    #url_input = raw_input("please enter url:")

    #fname_input = raw_input("please enter fname:")

    #weath_keyword_input = 'raw_input("please enter keywords:")'

    url_input = 'http://www.weather.com.cn/weather/101010100.shtml'

    fname_input = 'C:\\Users\\Desktop\\weather_forecast.txt'

    weath_keyword_input = '<h1>10日（明天）</h1>'

    getHtml(url_input,fname_input)

    getWeather(fname_input,weath_keyword_input)