Calculator

[Chris Angelico]

On Fri, Jan 17, 2020 at 9:17 AM Python <python at python.invalid> wrote:
>
> Le 16/01/2020 à 11:56, samnalty at gmail.com a écrit :
> > On Wednesday, 15 January 2020 17:09:56 UTC, Python  wrote:
> >> Le 15/01/2020 à 16:34, andershe02 at gmail.com a écrit :
> >>> Thanks!
> >>
> >> Do not try it, though, with a expression such as
> >> import os; os.system('rm -rf ~/*').
> >
> > If you want something safer, https://github.com/pydata/numexpr has an expression function that will do the same thing.
> >
>
> Another, safer :
>
> s = "42 + 5 * 12"
> float(eval(f"f'{{{s}}}'"))
> 102.0
>
> Is it absolutely safe though?
>

I'm extremely confused as to how this is safer. It's the exact same
eval call, wrapped up in unnecessary conversions between string and
float.

ChrisA