最近在做天气业务的延时监控,就是每隔一个小时检查一次天气数据是否变化,三次不变化就报警。由于页面给的数据的以json格式的,所以如何解析页面上的数据,从而获得我们想要的字段是我们首先考虑的问题。
一般来说,当我们从一个网页上拿下来数据,就是一个字符串,比如:
url_data = urllib2.urlopen(url).readline()
当我们这样得到页面数据,url_data是全部页面显示一个json字符串,那么我们如何将这个字符串转变为字典格式:time = json.loads(url_data)["weatherinfo"]["time"]
通过json模块的函数loads()可以将原来的字符串编码为字典,这样我们想去查找一个字段的key值就方便多了。
部分代码如下:
def getTime(url):
url_data = urllib2.urlopen(url).readline()
print url_data
time = json.loads(url_data)["weatherinfo"]["time"]
return time

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