Q: argparse.add_argument()

[Thomas Passin]

On 3/18/2023 2:02 PM, Gisle Vanem via Python-list wrote:
> I accidentally used 'argparse' like this in my Python 3.9 program:
>    parser.add_argument ("-c, --clean",  dest="clean", action="store_true")
>    parser.add_argument ("-n, --dryrun", dest="dryrun", action="store_true")
> 
> instead of:
>    parser.add_argument ("-c", "--clean",  dest="clean", 
> action="store_true")
>    parser.add_argument ("-n", "--dryrun", dest="dryrun", 
> action="store_true")
> 
> So any use of 'my-prog.py -cn' threw an error:
>    error: unrecognized arguments: -cn
> 
> So is there something that throws an error on this wrong use of
> "-c, --clean" instead? Could be useful. Or is "-c, --clean" legit somehow?


Are you trying to troll here?  You just showed how you got an error with 
this construction, so why are you asking how to get an error with this 
construction?