DO NOT USE file() (was Re: altering an object as you iterate over it?)

[Paul Rubin]

"Tim Peters" <tim.peters at gmail.com> writes:
> In 2.5 `file` is unchanged but `open` becomes a function:
> 
> >>> file
> <type 'file'>
> >>> open
> <built-in function open>

So which one are we supposed to use?