Python-使用google驱动器API时出现HttpError

Question

我使用python 3.4来利用Google API访问和读取用户Google驱动器中的文件。如果用户之前已经使用过该应用程序，他们应该有一个凭据文件，所以我希望能够通过尝试列出用户驱动器上的文件来测试凭据是否仍然有效。这个想法是，如果这个错误，那么应用程序知道它需要再次请求访问。

经过大量搜索，我尝试将以下示例中的代码拼凑在一起：
Google API命令
Google示例

我目前有以下代码：

import httplib2
from apiclient.discovery import build
from oauth2client.file import Storage
from oauth2client.client import AccessTokenRefreshError
from oauth2client.client import OAuth2WebServerFlow
def getAccess():
flow = OAuth2WebServerFlow(client_id, client_secret, scope,     redirect_uri="urn:ietf:wg:oauth:2.0:oob")
auth_uri = flow.step1_get_authorize_url()
print("Please go to the following webpage and copy and paste the access key onto the command line:n" + auth_uri + "n")
code = input("Please enter your access code:n")
credentials = flow.step2_exchange(code)
storage.put(credentials)
client_id = MYCLIENT_ID
client_secret = MYCLIENT_SECRET
scope = "https://www.googleapis.com/auth/drive"
storage = Storage('~/credentials.dat')
credentials = storage.get()
if credentials is None or credentials.invalid:
getAccess()
else:
try:
http = httplib2.Http()
http = credentials.authorize(http)
service = build('drive', 'v2', http=http)
param = {}
service.files().list(**param).execute()
except:
getAccess()

但是，service.files().list(**param).execute()行会产生以下错误消息：

Traceback (most recent call last):
File "GoogleAuth.py", line 64, in <module>
service.files().list(**param).execute()
File "C:Anaconda3libsite-packagesoauth2clientutil.py", line 137, in     positional_wrapper
return wrapped(*args, **kwargs)
File "C:Anaconda3libsite-packagesgoogleapiclienthttp.py", line 729, in execute
raise HttpError(resp, content, uri=self.uri)
googleapiclient.errors.HttpError

我试过玩一些不同的组合，比如：

service.files().list().execute()
service.apps().list().execute()

然而，我仍然收到相同的错误消息。知道发生了什么事吗？

Answer 1

问题是

service = build('drive', 'v2')

应该是

service = build('drive', 'v2', http=http)