python argparse: how to set “--version” “--help” confilct?

I have a python command programe, it has optional --version and --help argument. I want to set them confict each other. it means i can not type --help --version at the same time.

When i type ./demo --version --help it outputs the program's version infomation. When i type ./demo --help --version it outputs the program's help infomation.

I think this is weird，so i want to set then confict each other.

I tried the add_mutually_exclusive_group, but it makes no sense.

My program likes below:

#!python3
# -*- coding: utf-8 -*-
import argparse
parser = argparse.ArgumentParser()

parser.add_argument('-v', '--version', action='version',
version='%(prog)s 1.0', help="Show program's version number and exit.")
#parser.parse_args(['--version','--help'])
parser.parse_args(['--help','--version'])
Thanks very much！