A small and very basic python question

[Dennis]

I didn't give up after posting and managed to grasp this whole lambda 
thing! No need to respond now :-) I understood it the moment I tried to 
type out, instead of just thinking in my head, what was going on as a 
normal function.


Dennis wrote:
> Could anyone tell me how this line of code is working:
> 
> filter(lambda x: x in string.letters, text)
> 
> I understand that it's filtering the contents of the variable text and I 
> know that lambda is a kind of embedded function.
> 
> What I'd like to know is how it would be written if it was a normal 
> function.