[Python-ideas] eval_literal

[Mahmoud Hashemi]

You mean ast.literal_eval?
https://docs.python.org/2/library/ast.html#ast.literal_eval

Mahmoud
https://github.com/mahmoud
http://sedimental.org

On Mon, Jun 13, 2016 at 3:13 PM, <jab at math.brown.edu> wrote:

> (Riffing off some discussion in another thread, I had another idea I
> wanted to throw out there.)
>
> Given that Eval Really Is Dangerous[1], has something like this ever
> been considered?:
>
> >>> int(str(42))
> 42
> >>> float(str(42.0))
> 42.0
> >>> bool(str(False))  # :(
> True
> >>> eval_literal('42')
> 42
> >>> eval_literal('42.0')
> 42.0
> >>> eval_literal('False')  # :)
> False
> >>> eval_literal('', default=False)  # shout out to PEP 463 / Michael Selik
> False
>
> i.e. An extremely limited version of eval, possibly just for literals
> or even literal atoms, that would make it safe?
>
>
> [1] http://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html
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