I just went to this site http://cx-oracle.sourceforge.net/
to download cx_Oracle. I have the 11g Express running on Windows 7. My Python is on OS X 10.10.
It says .... "Install by issuing the command pip install cx_Oracle"
I get "Could not find a version that satisfies the requirement cx-Oracle (from version:)
No matching distribution found for cx-Oracle.
Since this is a python extension, i'm assuming it is installed on the machine with python.