python - 类型错误 : 'NoneType' object has no attribute '__getitem__' in python code which uses google API

Question

我有这段代码，它使用谷歌API在谷歌中搜索一个单词，但是一次它工作正常，但是如果我添加很多单词或者如果我运行它很多次，我就会不断收到以下错误...

    results = jsonResponse['responseData']['results']
TypeError: 'NoneType' object has no attribute '__getitem__'

我尝试在谷歌上搜索很多，但不知道问题是什么..任何人都可以帮助我了解这个问题以及如何处理它...正在努力解决这个错误

 import urllib
    import urllib2
    from urllib import urlencode
    import json as m_json
    from urllib2 import urlopen
    import re
    import json
    from nltk.corpus import stopwords
    import sys
    from urllib2 import urlopen
    import urllib2
    import simplejson
    import pprint

    words = ['headache','diabetes','myopia','dhaed','snow','blindness','head','ache','acne','aids','blindness','head','ache','acne','aids','blindness','head','ache','acne','aids']


    for word in words:
     url = ('https://ajax.googleapis.com/ajax/services/search/web'
           '?v=1.0&q='+word+'&userip=192.168.1.105')
     request = urllib2.Request(url)
     response = urllib2.urlopen(request)
     jsonResponse=json.loads(response.read())
     #print "the response now is: ",jsonResponse
     #pprint.pprint(jsonResponse)
     results = jsonResponse['responseData']['results']
     for result in results:
      print "\nthe result is: ",result
      url =result['url']
      print "\nthe url is: ",url
      try:
       page=urllib2.urlopen(url).read()
      except urllib2.HTTPError,err:
       if err.code == 403:
        print "bad"
        continue
       else:
        print "good"
        break
      except urllib2.HTTPError:
        print "server error"
      except:
       print "dont know the error"

谢谢先..

Answer 1

有可能当没有结果时，jsonResponse['responseData']是 None所以它没有名为 results 的属性在结果中或 responseData本身就是None (== JSON null )。 (字典查找失败，因为 jsonResponse 或 jsonResponse['responseData'] 为 null/None。

当错误发生时转储输出，看看哪个是 None然后在 results = jsonResponse['responseData']['results'] 行之前添加一个检查.