百度地图api使用-通过位置获取经纬度

from urllib import urlopen
url= 'http://api.map.baidu.com/geocoder/v2/?address=陕西西安&output=json&ak=你的ak'
print url
try:
    req = urlopen(url)
    content = req.read()
    print content
except Exception,e:
    print e