python 3.6 64 bit,Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production,cx_oracle 6.4.1
Able to connect DB thru sqlplus and sql developer manually.
when trying to connect through python:
cx_Oracle.DatabaseError: DPI-1047: 64-bit Oracle Client library cannot be loaded: "C:\Oracle\product\11.2.0\client_1\bin\oci.dll is not the correct architecture" .... 
manually verified that 
"C:\Oracle\product\11.2.0\client_1\BIN\" has the oci.dll
Please help
The DLL at C:\Oracle\product\11.2\client_1\bin\oci.dll is not a 64-bit DLL. You will need to download and extract a 64-bit Oracle Instant Client in order to resolve this issue. Note that the fact that the server is 64-bit is not relevant in this case. The client must be 64-bit!
Trying to connect a DB : Win7 Enterprise 64bit- Python cx_Oracle - oci.dll is not found