alter session set "_ORACLE_SCRIPT"=TRUE
create user ...

Reason:
SQL Error [2097] [42000]: ORA-02097: parameter cannot be modified because specified value is invalid
ORA-01031: insufficient privileges

'CREATE USER user1 IDENTIFIED BY "pass" DEFAULT TABLESPACE users QUOTA unlimited ON users'
'GRANT CREATE SESSION TO user1'
'GRANT CREATE TABLE TO user1'
'GRANT CREATE VIEW TO user1'
'GRANT CREATE SEQUENCE TO user1'

import cx_Oracle
..
dsn = cx_Oracle.makedsn('my.server.with.fqdn',1521,'MYDB')

        if dsn and sid and not service_name:
            dsn = cx_Oracle.makedsn(dsn, conn.port, sid)
            conn = cx_Oracle.connect(conn.login, conn.password, dsn=dsn)
        elif dsn and service_name and not sid:
            dsn = cx_Oracle.makedsn(dsn, conn.port, service_name=service_name)
            conn = cx_Oracle.connect(conn.login, conn.password, dsn=dsn)
        else:
            conn = cx_Oracle.connect(conn.login, conn.password, conn.host)

        :param service_name: the db_unique_name of the database that you are connecting to (CONNECT_DATA part of TNS)
        You can set these parameters in the extra fields of your connection
        as in ``{ "dsn":"some.host.address" , "service_name":"some.service.name" }``

ORCL	READ WRITE

import cx_Oracle
...     
dsn = cx_Oracle.makedsn(args['--server'], args['--port'], args['--dbname'], service_name=args['--dbname'])
print('dsn: {}'.format(dsn))
...
connection = cx_Oracle.connect(args['--dbadmin'], args['--dbadminpass'], dsn)
...

dsn: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=myhost)(PORT=1521))(CONNECT_DATA=(SID=ORCLCDB)(SERVICE_NAME=ORCLCDB)))
Traceback (most recent call last):
  File "/db.py", line 105, in <module>
    main(args)
  File "/db.py", line 68, in main
    connection = cx_Oracle.connect(args['--dbadmin'], args['--dbadminpass'], dsn)
cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

$ lsnrctl service

LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 22-MAR-2019 13:06:51

Copyright (c) 1991, 2016, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=0.0.0.0)(PORT=1521)))
Services Summary...
Service "83e7c9a565ff015be0530400000a92a7.localdomain" has 1 instance(s).
  Instance "ORCLCDB", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:47317 refused:0 state:ready
         LOCAL SERVER
Service "ORCLCDB.localdomain" has 1 instance(s).
  Instance "ORCLCDB", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:47317 refused:0 state:ready
         LOCAL SERVER
Service "ORCLCDBXDB.localdomain" has 1 instance(s).
  Instance "ORCLCDB", status READY, has 1 handler(s) for this service...
    Handler(s):
      "D000" established:0 refused:0 current:0 max:1022 state:ready
         DISPATCHER <machine: myhost, pid: 141>
         (ADDRESS=(PROTOCOL=tcp)(HOST=myhost.fqdn)(PORT=45017))
Service "orclpdb1.localdomain" has 1 instance(s).
  Instance "ORCLCDB", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:47317 refused:0 state:ready
         LOCAL SERVER
The command completed successfully

SERVICE_NAME=ORCLCDB.localdomain

CREATE USER user IDENTIFIED BY "pass" DEFAULT TABLESPACE users QUOTA unlimited ON users

Error: ORA-65096: invalid common user or role name

SERVICE_NAME=orclpdb1.localdomain

cx_Oracle.DatabaseError: ORA-01017: invalid username/password; logon denied