I issue this statement: db = cx_Oracle.connect("user/pass@IP/BKTDW")
and I get this error: 
Traceback (most recent call last):
  File "", line 1, in 
cx_Oracle.DatabaseError: Error while trying to retrieve text for error ORA-01804
It seems that connect method doen't work at all. I have installed the Oracle Client and I am connecting normally via Toad or Sql Developer. 
Please Help!
I had to set the ORACLE_HOME variable in the system variables and also add the bin directory in the PATH system variable. THNX
Can't connect with cx_Oracle of Python to oracle remote database