Filling in a tuple from unknown size list

[boblatest]

Hello all,

(sorry for posting from Google. I currently don't have access to my
normal nntp account.)

Here's my question: Given a list of onknown length, I'd like to be
able to do the following:

(a, b, c, d, e, f) = list

If the list has fewer items than the tuple, I'd like the remaining
tuple elements to be set to "None". If the list is longer, I'd like
the excess elements to be ignored.

The code snippet below does what I want, I was just wondering if there
was an interesting "Pythonic" way of expressing the same thing.

Thanks,
robert

def iter_inf(li, n):
    for i in range(n):
        if i < len(li):
            r = li[i]
        else:
            r = None
        i += 1
        yield r


li = ['a', 'b', 'c']
(a, b, c, d, e) =  iter_inf(li, 5)
print a, b, c, d, e