numeric expression from string?

[Claudio Grondi]

Brian Blais wrote:
> Hello,
> 
> I have a string input from the user, and want to parse it to a number, 
> and would like to know how to do it.  I would like to be able to accept 
> arithmetic operations, like:
> 
> '5+5'
> '(4+3)*2'
> '5e3/10**3'
> 
> I thought of using eval, which will work, but could lead to bad security 
> problems (not that it's a big  deal in my app, but still...)
> 
> string.atof won't do the job.  Is there a preferred way of doing this?
> 
> 
>         thanks,
> 
> 
>             Brian Blais
> 
> 
I have no idea if it is the right thing for what you need, so it would 
be nice to get response if it is or not:
   http://www.strout.net/python/pythonica.html

Claudio