ImportError：无法导入名称SignedJwtAssertionCredentials

Question

我正在尝试使用以下代码通过Python客户端访问google应用以获取授权（显然已删除了私人信息）：

import gflags
import httplib2

from apiclient.discovery import build
from oauth2client.file import Storage
from oauth2client.client import SignedJwtAssertionCredentials
from oauth2client.tools import run

f = open('privatekey.p12', 'rb')
key = f.read()
f.close()
credentials = SignedJwtAssertionCredentials(
    service_account_name='[e-mail]',
    private_key=key,
    scope = 'https://www.googleapis.com/auth/calendar')
http = httplib2.Http()
http = credentials.authorize(http)
service = build(serviceName='calendar', version='v3', http=http)

但是我收到此错误：

ImportError: cannot import name SignedJwtAssertionCredentials

我已经安装了Google v3 API Python客户端以及OAuth2；尽管这些模块并没有太多使用，但似乎没有任何其他问题。有人知道发生了什么吗？

Answer 1

似乎您尚未安装pyopenssl。通过安装easy_install pyopenssl。

Libraries oauth2client.client
if HAS_OPENSSL:
  # PyOpenSSL is not a prerequisite for oauth2client, so if it is missing then
  # don't create the SignedJwtAssertionCredentials or the verify_id_token()
  # method.

  class SignedJwtAssertionCredentials(AssertionCredentials):
....