[netdog]

My for-real-not-humor implementation:

    def fizzbuzz(i, n):
        while i <= n:
            yield i%15 and (i%5 and (i%3 and i or 'fizz') or 'buzz') or 'fizzbuzz'
            i += 1

    for x in fizzbuzz(1, 100):
        print x

[nailer]

Tight, but I'd still use multiple yields, all the conditions in the one liner may be difficult to read.

[kzrdude]

real oldschool, since you don't use the ternary if that's available since Python 2.5.