on the prng behind random.random()
Am 19.11.18 um 22:05 schrieb Robert Girault:
> Chris Angelico <rosuav at gmail.com> writes:
>> On Tue, Nov 20, 2018 at 7:31 AM Robert Girault <r at dev.null> wrote:
>>> Nice. So Python's random.random() does indeed use mt19937. Since it's
>>> been broken for years, why isn't it replaced by something newer like
>>> ChaCha20? Is it due to backward compatibility? That would make sense.
>> What exactly do you mean by "broken"?
> I mean the fact that with 624 samples from the generator, you can
> determine the rest of the sequence completely.
As far as I understand it, this is true only if you see the full 32bit
output number from the Mersenne Twister for those 624 outputs. If
however you create a list:
[random.randrange(10) for i in range(624)]
I don't think you can predict what follows.