Python 3000 idea -- + on iterables -> itertools.chain

[Fredrik Lundh]

John Reese wrote:

> It seems like it would be clear and mostly backwards compatible if the
> + operator on any iterables created a new iterable that iterated
> throught first its left operand and then its right, in the style of
> itertools.chain. 

you do know that "iterable" is an informal interface, right?  to what 
class would you add this operation?

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