Idiom for default values when unpacking a tuple

[Jeff Epler]

A function to pad a tuple to a given length is not hard to write.
[l] * i is empty if i <= 0, otherwise it has i repetitions of l.

def pad(t,l):
    return t + (None,) * (l - len(t))

tup = (1,2)
a, b, c = pad(tup, 3)
print a, b, c

Jeff
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