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Sandboxing eval() (was: Calculator)

> On 19. Jan 2020, at 19:35, musbur at wrote:
> Is it actually possible to build a "sandbox" around eval, permitting it
> only to do some arithmetic and use some math functions, but no
> filesystem acces or module imports?
> I have an application that loads calculation recipes (a few lines of
> variable assignments and arithmetic) from a database. 
> exec(string, globals, locals)
> with locals containing the input variables, and globals has a
> __builtin__ object with a few math functions. It works, but is it safe?

Might be a good starting point.

Greetings Stephan