How to make argparse accept "-4^2+5.3*abs(-2-1)/2" string argument?

[Cameron Simpson]

On 23Jan2023 17:58, Jach Feng <jfong at ms4.hinet.net> wrote:
>>>> parser.parse_args(['--', 'infix2postfix.py', '-4.3+5'])
>usage: [-h] infix
>: error: unrecognized arguments: -4.3+5

This error doesn't look like "-4.3+5 looks like an option" but instead 
"we don't expect any arguments after "infix".

Not personally a fan of argparse myself, but then I have my own 
elaborate command line framework which generally uses getopt for the 
option stuff.

Cheers,
Cameron Simpson <cs at cskk.id.au>