python如何使用google api抓取google搜索结果

python通过google api抓取google搜索结果，其中q参数为要搜索的关键词

#!/usr/bin/python  
  
import urllib  
  
import simplejson  
  
query = urllib.urlencode({'q' : '75271.com'})
  
url = 'http://ajax.useso.com/ajax/services/search/web?v=1.0&%s'%(query)
  
search_results = urllib.urlopen(url)  
  
json = simplejson.loads(search_results.read())

print(json)
  
results = json['responseData']['results']  
  
for i in results:  
  
  print i['title'] + ": " + i['url']