---------- Forwarded message ---------- Date: Sun, 29 Oct 2006 12:33:58 -0500 From: Kristinn Didriksson <[EMAIL PROTECTED]> To: Danny Yoo <[EMAIL PROTECTED]> Subject: Re: [Tutor] name is not defined error
Hi Danny, Thanks :) The program works now. I'll take a look at those threads. Here is what the book says " This function (eval) takes any string and evaluates it as if it were a Python expression." I took that to mean that it would turn a sting into an integer. Oops. it is a little confusing to get started, but lots of practice will change that. Thanks for your help. Regards, Kristinn On Oct 29, 2006, at 12:15 PM, Danny Yoo wrote: > > >> It is my understanding that eval turns a string into a number and then I can >> do math operations on it. > > Hi Kristinn, > > No, no, that's not what it does. *grin* > > Where did you read about eval() from? If you saw it in a beginner's > tutorial, tell us who the guilty party is so we can knock some sense into > that tutorial. > > Don't use eval(): it's "unsafe" in the sense that it does something much more > than what one might expect. I won't say too much more about it at the moment, > but if you're interested, see the threads: > > http://mail.python.org/pipermail/tutor/2001-September/008967.html > http://mail.python.org/pipermail/tutor/2004-December/033828.html > > for examples. Again, I have to say this again: don't use eval() unless you > really know what you're doing. > > > Anyway, I think you're looking for the ord() function: > > http://docs.python.org/lib/built-in-funcs.html#l2h-55 > > Its inverse is the chr() function: > > http://docs.python.org/lib/built-in-funcs.html#l2h-15 > > Good luck! _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
