Re: Simple and safe evaluator

George Sakkis wrote:
On Jun 16, 4:47 pm, bvdp <b...@xxxxxxxxxxxx> wrote:

2. I thought I'd be happy with * / + -, etc. Of course now I want to add
a few more funcs like int() and sin(). How would I do that?

For the builtin eval, just populate the globals dict with the names
you want to make available:

import math

globs = {'__builtins__' : None}

# expose selected builtins
for name in 'True False int float round abs divmod'.split():
globs[name] = eval(name)

# expose selected math constants and functions
for name in 'e pi sqrt exp log ceil floor sin cos tan'.split():
globs[name] = getattr(math,name)

return eval(s, globs, {})


Thanks. That was easy :)

The change to the _ast version is left as an exercise to the reader ;)

And I have absolutely no idea on how to do this. I can't even find the _ast import file on my system. I'm assuming that the _ast definitions are buried in the C part of python, but that is just a silly guess.

Bob.
.

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