[Python-ideas] + operator on generators

[lucas]

Hello !

I often use generators, and itertools.chain on them.
What about providing something like the following:

    a = (n for n in range(2))
    b = (n for n in range(2, 4))
    tuple(a + b)  # -> 0 1 2 3

This, from user point of view, is just as how the
__add__ operator works on lists and tuples.
Making generators works the same way could be a great way to avoid calls
to itertools.chain everywhere, and to limits the differences between
generators and other "linear" collections.

I do not know exactly how to implement that (i'm not that good at C, nor
CPython source itself), but by seeing the sources,
i imagine that i could do something like the list_concat function at
Objects/listobject.c:473, but in the Objects/genobject.c file,
where instead of copying elements i'm creating and initializing a new
chainobject as described at Modules/itertoolsmodule.c:1792.

(In pure python, the implementation would be something like `def
__add__(self, othr): return itertools.chain(self, othr)`)

Best regards,
--lucas

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