[Python-ideas] Change how Generator Expressions handle StopIteration

[Greg]

On 5/11/2014 1:55 p.m., Terry Reedy wrote:

> There is already a 'default' option, so the two would have to be
> mutually exclusive.
>
> "next(iterator[, default])

If it were a keyword-only argument, there wouldn't be any
conflict.

But I'm not sure I like the idea of adding more complexities
to the iterator protocol.

Anything that changes the signature of __next__ or __iter__
would be a bad idea, since all existing iterables
would need to be updated to take it into account.

If this is is to be done, it might be better to add a new
optional dunder method, so that existing iterables would
continue to work.

-- 
Greg