Some thougts on cartesian products
cito at online.de
Sun Jan 22 19:06:46 CET 2006
Alex Martelli schrieb:
> Christoph Zwerschke <cito at online.de> wrote:
>> given length. You could get a 6/49 lotto tip with something like:
> And that would be better than the current random.sample(range(49),6) in
> WHAT ways, exactly...?
You're right, random.sample(range(49),6) does the same and much faster.
I just didn't think of it (it is new since Python 2.3).
What if you need 12 different tips for your lotto ticket?
s = set(range(49)).powerset(6)
for x in range(10):
But the real disadvantage of this idea is the memory consumed and the
time to set up that memory: set(range(49)).powerset(6) has a cardinality
of about 13 million entries! You PC would start to swap just for getting
a lotto tip...
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