tuple.index(item)

[Raymond Hettinger]

[David Isaac]
> > Why don't tuples support an index method?
> > It seems natural enough ...

[Peter Hansen]
> This question has been posed several (many?) times in the past.  See the
> archives for more detail, but basically the answer that is usually given
> is this:
>
> Tuples are intended to be used somewhat like C "structs", or Pascal
> "records", which is to say they should contain heterogeneous sequences
> of information for which the concept of ".index()" is fairly
> meaningless.  They are _not_ generally intended to be used as "read-only
> lists", and that's basically why .index() wasn't defined for them.
>
> Another answer that probably follows close on the heels of that one is
> along the lines of "patches are always welcome", but I honestly don't
> know if a patch to add this would be accepted.  Probably checking
> Sourceforge for past patches would give an answer, since it seems likely
> someone has already tried.

Executive summary:  Guido likes it the way it is.  Someday, he may
change his mind.  Probably not.


Raymond Hettinger