Some thougts on cartesian products

Christoph Zwerschke cito at
Sun Jan 22 14:07:34 EST 2006

Alex Martelli schrieb:
>> s = set(range(49)).powerset(6)
>> for x in range(10):
>>      print s.pop()
> This is very systematic, not random;-).  Still, using random.sample on s
> would indeed produce 12 random different tips!-)

Right, that would be systematic. What I wanted to write was:

s = set(range(49)).powerset(6)
for x in range(10):
      c = choice(s)
      print c

Of course you could also use random.sample again:
random.sample(set(range(49)).powerset(6), 10)
But this would be just as inefficient.

> tips = set()
> while len(tips) < 10:
>   tip = frozenzet(random.sample(range(49), 6))
>   tips.add(tip)

Yep, that's better. The amount of hand coding is even the same as above.

-- Christoph

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