Why not just show the out-of-range index?

[Russ]

Fredrik Lundh wrote:
> Russ wrote:
>
> > Holy cow! I can't believe that many changes would be necessary unless
> > the IndexError exception is scattered all over the place. I would hope
> > that one well-placed change could fix the bulk of cases.
>
> when you write x[i], the interpreter makes no assumptions about x and i
> and len(x); it just calls the corresponding method (__getitem__), either
> directly, or via a C-level internal slot.
>
> there's no way to generate the error message you want in a single place
> without changing the semantics of x[i].

Then how about just changing __getitem__ for the built-in list type.
Wouldn't that take care of the vast majority of cases? Let anyone who
writes their own __getitem__ handle it themselves if they wish. I'm
just asking. I don't claim to know anything about the internals of the
Python interpreter.