利用google的API获取世界城市经纬度(python实现)

google API 需要  .......
#-*- coding: utf8 -*-

from xml.dom import minidom
import urllib2, urllib

#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
KEY = 'ABQIAAAAm5e8FerSsVCrPjUC9W8BqBShYm95JTkTs6vbZ7nB48Si7EEJuhQJur9kGGJoqUiYond0w-7lKR6JpQ'

class GetData(object):
    def __init__(self):
        self.values = {'q': '',
                'sensor': 'false',
                'output': 'xml',
                'oe': 'utf8'}
        self.url = 'http://maps.google.com/maps/geo'

    def catchData(self, city, key=KEY):
        '''
        利用google map api从网上获取city的经纬度。
        '''
        self.values['q'] = city
        #self.values['key'] = key
        arguments = urllib.urlencode(self.values)
        url_get = self.url + '?' + arguments
        handler = urllib2.urlopen(url_get)
        try:
            self.lon, self.lat = self.parseXML(handler)
            #print 'lon:%d\tlat:%d' % (self.lon, self.lat)
            return self.lon, self.lat
        except IndexError:
            print '城市: %s 发生异常！' % (city,)
        finally:
            handler.close()
       
    def parseXML(self, handler):
        '''
        解析从API上获取的XML数据。
        '''
        xml_data = minidom.parse(handler)
        data = xml_data.getElementsByTagName('coordinates')[0].firstChild.data
        coordinates = data.split(',')
        lon = int(float(coordinates[0]) * 1000000)
        lat = int(float(coordinates[1]) * 1000000)
        return lon, lat
       
if __name__ == '__main__':
    getData = GetData()
    cityName = raw_input('请输入一个城市：')
    longitude, latitude = getData.catchData(cityName)
    print '%s \n经度：%d\n纬度：%d\n' % (cityName, longitude, latitude)