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

[Jach Feng]

Chris Angelico 在 2023年1月24日 星期二清晨5:00:27 [UTC+8] 的信中寫道：
> On Tue, 24 Jan 2023 at 07:47, Cameron Simpson <c... at cskk.id.au> wrote: 
> > 
> > But for Jach Feng: the "--" is really expected as something the user 
> > does when they invoke your programme, _explicitly_ saying that what 
> > follows from here is not an argument. So the user is expected to type: 
> > 
> > your_script -x -y -- "-4^2+5.3*abs(-2-1)/2" 
> > 
> > where there are -x and -y options, then end of options, then an 
> > argument, which would look like an option if there wasn't the "--" 
> > argument.
> And if you DON'T expect the user to enter the "--", then why use 
> argparse? You can just check argv directly to get your arguments. 
> 
> This entire thread is a massive "how can I use X to do Y?" problem. 
> 
> ChrisA
The '--' requirement makes its usage less instinctive, and handling argv directly makes me loss the benefit of using '-h':-)