[Tutor] Converting string or list to sum

[Alan Gauld]

>    >  d = ''.join(map(str, a))
>    >
>    >since that's probably much faster for large lists.
>    >
>  
> I think that should be:
> import __builtin__
> d = ''.join(map(__builtin__.str, a))

Why?

Builtins are, as the name says built in, you dont 
need to import them! And you don't need to prefix 
with the module name. Why did you think you'd 
need to do that? Do you habitually import __builtins__?
Have you had problems using builtin functions?

Alan G.