利用google的API获取世界城市经纬度(python实现)

 1 #-*- coding: utf8 -*-
 2  
 3  from xml.dom import minidom
 4  import urllib2, urllib
 5 
 6 #这个KEY本来是google要求的，否则不允许用它的API，可是我没用这个KEY也可以啊...囧了
 7 KEY = 'ABQIAAAAm5e8FerSsVCrPjUC9W8BqBShYm95JTkTs6vbZ7nB48Si7EEJuhQJur9kGGJoqUiYond0w-7lKR6JpQ'
 8 
 9 class GetData(object):
10     def __init__(self):
11         self.values = {'q': '', 
12                 'sensor': 'false', 
13                 'output': 'xml', 
14                 'oe': 'utf8'}
15         self.url = 'http://maps.google.com/maps/geo'
16 
17     def catchData(self, city, key=KEY):
18         '''
19         利用google map api从网上获取city的经纬度。
20         '''
21         self.values['q'] = city
22         #self.values['key'] = key
23         arguments = urllib.urlencode(self.values)
24         url_get = self.url + '?' + arguments
25         handler = urllib2.urlopen(url_get)
26         try:
27             self.lon, self.lat = self.parseXML(handler)
28             #print 'lon:%d\tlat:%d' % (self.lon, self.lat)
29             return self.lon, self.lat
30         except IndexError:
31             print '城市: %s 发生异常！' % (city,)
32         finally:
33             handler.close()
34         
35     def parseXML(self, handler):
36         '''
37         解析从API上获取的XML数据。
38         '''
39         xml_data = minidom.parse(handler)
40         data = xml_data.getElementsByTagName('coordinates')[0].firstChild.data
41         coordinates = data.split(',')
42         lon = int(float(coordinates[0]) * 1000000)
43         lat = int(float(coordinates[1]) * 1000000)
44         return lon, lat
45         
46 if __name__ == '__main__':
47     getData = GetData()
48     cityName = raw_input('请输入一个城市：')
49     longitude, latitude = getData.catchData(cityName)
50     print '%s \n经度：%d\n纬度：%d\n' % (cityName, longitude, latitude)