Adding a Par construct to Python?

[Diez B. Roggisch]

> 
>> My math-skills are a bit too rusty to qualify the exact nature of
>> the operation, commutativity springs to my mind.
> 
> And how is reduce() supposed to know whether or not some arbitrary 
> function is commutative?

I don't recall anybody saying it should know that - do you? The OP wants 
to introduce parallel variants, not replace the existing ones.

Diez