[Python-ideas] Function to unnest for-statements

[Georg Brandl]

Carl Johnson schrieb:

> for a in [True, False]:
>     for b in [True, False]:
>         for c in [True, False]:
>             print a, b, c
> 
> Which yields
> 
> True True True
> True True False
> True False True
> True False False
> False True True
> False True False
> False False True
> False False False
> 
> But if you don't know how many variables you'll have, you're stuck  
> writing a complicated function instead of using a nice, simple for-loop.
> 
> So, going back to the first example, wouldn't it be nicer to write:
> 
> for x, y, z in combine(xs, ys, zs):
>     #Do something

> So, what do you think? Is this a common enough need that it should be  
> built into itertools?

Presumably, since it has been added to itertools in 2.6 under the name
product(). (Maybe Raymond borrowed the time machine?) :)

Georg

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