How to test if variable is of type cx_Oracle.OBJECT

Question

Here more or less is my Python code.

import cx_Oracle

conn = cx_Oracle.connect( "...")
cursor = conn.cursor()
cursor.execute( "SELECT * FROM test_table" )

row = cursor.fetchone():
for col in row:
  print type( col )
  if isinstance( col, cx_Oracle.OBJECT):
    print "true"

If the underlying column in Oracle is of type GEOMETRY, the Python type will be cx_Oracle.OBJECT. In the output, I will see <type 'cx_Oracle.OBJECT'>, but it will not be followed by "true"

This is probably because cx_Oracle.OBJECT returns <type 'cx_Oracle.OBJECTVAR'>

How do I determine if the type is cx_Oracle.OBJECT?

I recognize that there are many ways that I could approach this problem without needing to deal with this question (eg str(type(col)) and compare as a string), but now I just want to understand the correct way to do in Python.