append special chars with "\"

[tertius]

tertius wrote:
> Is there a better way to append certain chars in a string with a 
> backslash that the example below?
> 
> chr = "#$%^&_{}"          # special chars to look out for
> str = "123 45^ & 00 0_"   # string to convert
> n = ""                    # init new string
> for i in str:
>     if i in chr:          # if special character in str
>         n+='\\'           # append it with a backslash
>     n+=i
> print "old:",str
> print "new:",n
> 
> 
> Thanks
> Tertius
> 
I meant *pre*-pend... but the msg got accross.

Thanks all!!