Question

我希望通过Google应用引擎上托管的网络表单获取Twitter访问令牌。我写了一个python代码来做到这一点。虽然它在我本地计算机上的终端上运行得相当好，但是当我在Google App引擎sdk上部署它时会出错。

'NoneType' object has no attribute '__getitem__'

相同的代码是：

import sys
import requests,sys
sys.path.insert(0,'requests_oauthlib')
from requests_oauthlib import OAuth1
from urlparse import parse_qs

REQUEST_TOKEN_URL = "https://api.twitter.com/oauth/request_token"
AUTHORIZE_URL = "https://api.twitter.com/oauth/authorize?oauth_token="
ACCESS_TOKEN_URL = "https://api.twitter.com/oauth/access_token"

CONSUMER_KEY = "XXXXX"
CONSUMER_SECRET = "XXXXX"

OAUTH_TOKEN = ""
OAUTH_TOKEN_SECRET = ""

def setup_oauth():
    """Authorize your app via identifier."""
    # Request token

    oauth = OAuth1(CONSUMER_KEY, client_secret=CONSUMER_SECRET)
    r = requests.post(url=REQUEST_TOKEN_URL, auth=oauth)
    credentials = parse_qs(r.content)

    resource_owner_key = credentials.get('oauth_token')[0]
    resource_owner_secret = credentials.get('oauth_token_secret')[0]

    # Authorize
    authorize_url = AUTHORIZE_URL + resource_owner_key
    print 'Please go here and authorize: ' + authorize_url

    verifier = raw_input('Please input the verifier: ')
    oauth = OAuth1(CONSUMER_KEY,
                   client_secret=CONSUMER_SECRET,
                   resource_owner_key=resource_owner_key,
                   resource_owner_secret=resource_owner_secret,
                   verifier=verifier)

    # Finally, Obtain the Access Token
    r = requests.post(url=ACCESS_TOKEN_URL, auth=oauth)
    credentials = parse_qs(r.content)
    token = credentials.get('oauth_token')[0]
    secret = credentials.get('oauth_token_secret')[0]

    return token, secret

def get_oauth():
    oauth = OAuth1(CONSUMER_KEY,
                client_secret=CONSUMER_SECRET,
                resource_owner_key=OAUTH_TOKEN,
                resource_owner_secret=OAUTH_TOKEN_SECRET)
    return oauth

从类的post方法调用setup_oauth，用户在单击按钮后被重定向。

追溯：

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__
    return handler.dispatch()
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch
    return method(*args, **kwargs)
  File "/base/data/home/apps/s~twitterlookback/2.374658065002598509/testing.py", line 86, in post
    token, secret = setup_oauth()
  File "/base/data/home/apps/s~twitterlookback/2.374658065002598509/testing.py", line 43, in setup_oauth
    resource_owner_key = credentials.get('oauth_token')[0]
TypeError: 'NoneType' object has no attribute '__getitem__'

现在，如果我dir(credentials)，我将其作为输出

['__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values', 'viewitems', 'viewkeys', 'viewvalues']

显然有__getitem__。我不知道为什么它仍然显示错误。

Answer 1

TypeError: 'NoneType' object has no attribute '__getitem__'错误是因为您尝试拨打__getitem___调用credentials.get('oauth_token') None而不是列表的结果。

你应该总是检查从这样的调用返回的内容，而不是假设你得到了预期的结果，或者将它包装在try块中。

Answer 2

Google App引擎未收到如下说明： verifier = raw_input（'请输入验证者：'）因为是一个web平台而不是shell。有必要以httprequest httpresponse方式输入信息。可以使用webapp，django等将“verifier”输入到您的应用程序中

获取托管在Google应用引擎上的Twitter应用的访问令牌

2 个答案: