Llame al procedimiento almacenado que contiene una colección de registros usando callproc en python

No puede usar directamente collections.namedtuple como tipo de objeto de Oracle.

Probé lo siguiente en Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 con Cx-Oracle-7.0.0 y Python 3.6.4 y me funciona.

Crear TIPO

CREATE OR REPLACE TYPE object_tag_rec AS OBJECT (
     tag_type       VARCHAR2(1),
     tag_category   VARCHAR2(100),
     tag_key        VARCHAR2(250),
     tag_value      VARCHAR2(250),
     created_by     VARCHAR2(50)
);
/

Crear colección

CREATE OR REPLACE TYPE object_tag_tbl is TABLE OF object_tag_rec;
/

Crear procedimiento

CREATE OR REPLACE procedure  sp_add_object_tags(
pi_account_id               IN  INT,
pi_object_id                IN  INT,
pi_all_tags_identified      IN  VARCHAR2,
pi_object_tag_tbl           IN  object_tag_tbl,
po_error_code               OUT NUMBER,
po_error_message            OUT VARCHAR2 )
AS 
BEGIN

   po_error_code    := 0;
   po_error_message := 'NO ERRORS';
END;
/

código

import cx_Oracle
conn = cx_Oracle.connect('user/[email protected]//localhost:1521/dbname')
cur = conn.cursor()

recordTypeObj = conn.gettype("HR.OBJECT_TAG_REC") #mind the cases
tableTypeObj  = conn.gettype("HR.OBJECT_TAG_TBL")
params = tableTypeObj.newobject()

rec = recordTypeObj.newobject()
(rec.TAG_TYPE,rec.TAG_CATEGORY,rec.TAG_KEY,rec.TAG_VALUE,rec.CREATED_BY) = ("S","person","person","1","abc")  
#mind the cases for attributes.

po_error_code    = cur.var(cx_Oracle.NUMBER)
po_error_message = cur.var(cx_Oracle.STRING)

params.append(rec)
cur.callproc('dbms_output.enable')
cur.callproc('hr.sp_add_object_tags', [1234, 5678, 'N', params, po_error_code, po_error_message])

print (po_error_code.getvalue(),po_error_message.getvalue())

Ejecución

$python pass_obj.py
0.0 NO ERRORS