Argparse should do this. It is feature rich and flexible. For your case, the below does the job:

import argparse
parser = argparse.ArgumentParser(description='Description of your app here.')
parser.add_argument('-N', '--integers', default=5,  help='your help text here')
parser.add_argument('-S', '--sortby', default='Change', choices=['Change', 'SomeOtherOption'], help='some help text here ')

if __name__ == "__main__":
  args = parser.parse_args()
  print(args.integers) # prints 5 if nothing provided
  print(args.sortby)  # prints 'Change' if nothing provided

Running this:

from sys import argv

import typer

app = typer.Typer()


@app.command(
    context_settings={"allow_extra_args": True, "ignore_unknown_options": True}
)
def main(foo: str = typer.Option(...), unknown_args: typer.Context = typer.Option(None)):
    typer.echo(f"known arg: {foo}")
    for unknown_arg in unknown_args.args:
        typer.echo(f"Got extra arg: {unknown_arg}")


if __name__ == "__main__":
    argv.extend(["--foo", "BAR", "spam"])
    app()

will output:

known arg: BAR
Got extra arg: spam

source:

• https://typer.tiangolo.com/tutorial/commands/context/#configuring-the-context
• https://github.com/tiangolo/typer/issues/163