[Python-ideas] __len__() for map()

[danish bluecheese]

>
>
> On Mon, Nov 26, 2018 at 10:14:58PM +0000, Jonathan Fine wrote:
>
> > Briefly, I don't like your suggestion because many important iterables
> > don't have a length!
>
> But many important iterables do.
>

I agree many important iterables do have.

On Mon, Nov 26, 2018 at 02:06:52PM -0800, Michael Selik wrote:
> If you know the input is sizeable, why not check its length instead of the
> map's?

The consumer of map may not be the producer of map.

Very good point.

Honestly, i like the proposal but love to see more reviews on the idea.
Maybe i am missing something.
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