create an image caption in blender python part 1

make_caption_part1.py

import os
import sys
import argparse

try:
    import bpy
except ImportError:
    print("Module 'bpy' could not be imported. This probably means you are not using Blender to run this script.")
    sys.exit(1)

prog_name = "Captions Tool "

if '--' not in sys.argv:
    print(prog_name + "No '--' found in command line arguments. '--' is needed to pass arguments to this script.")
    sys.exit(1)