我正在按照Android版Google登录文档（https://developers.google.com/identity/sign-
in/android/backend-auth）中的说明进行操作，并尝试在我的Python代码中实施令牌验证。

我正在本地主机上开发。出于某种原因，当我尝试将此导入from oauth2client import client, crypt到我的Google
App Engine后端时遇到此错误，出现以下错误：

ImportError: No module named oauth2client.client`

我已经使用sudo pip install –upgrade google-api-
python（https://developers.google.com/api-client-
library/python/start/installation）安装了oauth2 。安装日志显示：

Requirement already up-to-date: google-api-python-client in /usr/local/lib/python2.7/dist-packages/google_api_python_client-1.5.0-py2.7.egg
Requirement already up-to-date: httplib2>=0.8,<1 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Downloading/unpacking oauth2client>=2.0.0,<3 from https://pypi.python.org/packages/source/o/oauth2client/oauth2client-2.0.0.post1.tar.gz#md5=6309e12fe2bc0f038708e2c9ec4b1f69 (from google-api-python-client)
Downloading oauth2client-2.0.0.post1.tar.gz (66kB): 66kB downloaded
Running setup.py (path:/tmp/pip_build_root/oauth2client/setup.py) egg_info for package oauth2client
warning: no previously-included files matching '*' found under directory 'tests'
Requirement already up-to-date: six>=1.6.1,<2 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already up-to-date: uritemplate>=0.6,<1 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already up-to-date: pyasn1>=0.1.7 in /usr/local/lib/python2.7/dist-packages (from oauth2client>=2.0.0,<3->google-api-python-client)
Requirement already up-to-date: pyasn1-modules>=0.0.5 in /usr/local/lib/python2.7/dist-packages (from oauth2client>=2.0.0,<3->google-api-python-client)
Requirement already up-to-date: rsa>=3.1.4 in /usr/local/lib/python2.7/dist-packages (from oauth2client>=2.0.0,<3->google-api-python-client)
Requirement already up-to-date: simplejson>=2.5.0 in /usr/local/lib/python2.7/dist-packages (from uritemplate>=0.6,<1->google-api-python-client)
Installing collected packages: oauth2client
Found existing installation: oauth2client 2.0.0-post1
Uninstalling oauth2client:
Successfully uninstalled oauth2client
Running setup.py install for oauth2client
warning: no previously-included files matching '*' found under directory 'tests'
Successfully installed oauth2client

我看到有人提供了答案，但我不知道如何执行此处描述的符号链接：Google App Engine（python）ImportError：Google App
Engine中没有名为oauth2的模块

我在想这与路径有关，但是我不知道如何设置它以便全局安装oauth2client。我在VM上运行Ubuntu 14.04 LTS。

任何帮助，将不胜感激。