I tried to install Google APIs Client Library via terminal and got the following result:
$ sudo pip install google-api-python-client
The directory '/home/masterqiao/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/masterqiao/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied: google-api-python-client in /usr/local/lib/python2.7/dist-packages
Requirement already satisfied: httplib2<1dev,>=0.9.2 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already satisfied: oauth2client<5.0.0dev,>=1.5.0 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already satisfied: uritemplate<4dev,>=3.0.0 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already satisfied: six<2dev,>=1.6.1 in /usr/local/lib/python2.7/dist-packages (from google-api-python-client)
Requirement already satisfied: pyasn1>=0.1.7 in /usr/local/lib/python2.7/dist-packages (from oauth2client<5.0.0dev,>=1.5.0->google-api-python-client)
Requirement already satisfied: pyasn1-modules>=0.0.5 in /usr/local/lib/python2.7/dist-packages (from oauth2client<5.0.0dev,>=1.5.0->google-api-python-client)
Requirement already satisfied: rsa>=3.1.4 in /usr/local/lib/python2.7/dist-packages (from oauth2client<5.0.0dev,>=1.5.0->google-api-python-client)