iterating over a combinatorial class

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It is somewhat annoying that len and next don't do what you think with combinatorial classes. Is there any more Pythonic (e.g. list comprehension) way to do the following?

prof = [1,3,2,0,0,3]
L = []
P = Permutations(3)
Q = P.__iter__()
for j in range(P.cardinality()):
    tp = Q.next()
    for i in range(prof[j]):
        L.append(tp)

Part of the issue is that I would really rather not use Q, since it is "used up" when I'm done. I really want something that is succinct, but I just could not find a way to do it.