Idiom for default values when unpacking a tuple

[Diez B. Roggisch]

You can always have a try/exept clause around unpacking. That you could
fator out into a function that always returns the right sized tuples. Like
this:

def unpack(t):
    try:
        a,b,c = t
        d = None
    except ValueError:
        a,b,c,d = t
    return a,b,c,d

-- 
Regards,

Diez B. Roggisch