def a((b,c,d),e):

[AdSR]

> if you think this is an "atrocity", maybe programming isn't for you.

My resume might suggest otherwise but I guess that's not the main topic
here. Maybe I got carried away -- this one took me completely by
surprise.

Anyway, this gets interesting:

def z(((a, b), (c, d)), (e, f)):
    pass

although I see that it could be perfectly valid in some contexts.

Cheers,

AdSR