As a few others mentioned, the argparse module from the stdlib is the way to go for Python. It takes care of most of this for you in an optimized way. Here's a minimal example of the above:

#!/bin/env python3

import argparse


# Setup main parser
parser = argparse.ArgumentParser(
    prog="app",
    description="App that manages things and jobs",
)
parser.add_argument(
    "-v",
    "--verbose",
    action="store_true",
)
subparsers = parser.add_subparser(
    help="Sub commands",
    dest="command",
)

# Setup sub-parsers
thing_parser = subparsers.add_parser(
    "thing",
    help="Manage things",
)
# thing_parser args
thing_parser.add_argument(
    "--dry_run",
    action="store_true",
    help="dry run",
)
thing_parser.add_argument(
    "--create",
    action="store_true",
    help="Create thing",
)
thing_parser.add_argument(
    "--name",
    action="store",
    type=str,
    required=True,
    nargs="+",
    help="Thing name",
)

job_parser = subparsers.add_parser(
    "job",
    help="Manage jobs",
)
job_parser.add_argument(
    "--cancel",
    "-c",
    action="store_true",
    help="Cancel job",
)
job_parser.add_argument(
    "--index",
    "-i",
    action="store",
    type=int,
    required=True,
    nargs="+",
    help="Job index",
)


def main():
    args=parser.parse_args()
    if args.verbose:
        print("Verbose mode")
    # Match-Case statement for cleaner logic
    match args.command:
        case "thing":
            # thing logic and function calls here
        case "job":
            # job logic and function calls here
        case _:
            parser.print_usage()

if __name__ == "__main__":
    main()