Random number generator is not generating random numbers.

[mytechnotalent]

import random

random_number = random.randint(1, 20)
print(random_number)

It is printing the same one random number. In this case it is 7 @microbit-carlos as we discussed.

[carlosperate]

uBit.init should be seeding the random number generator:

micropython-microbit-v2/src/codal_app/main.cpp

Lines 52 to 53 in 0c4287c

	int main() {
	uBit.init();

https://github.com/lancaster-university/codal-microbit-v2/blob/d49c441bb712bc02bf2c7e4d95b757721eb54e4a/model/MicroBit.cpp#L169

[dpgeorge]

It is printing the same one random number.

Do you mean it prints the same number each time it starts up? Calling randint() again and again should return different values.

Note that the random module uses its own pseudo-RNG, not anything from CODAL.

[mytechnotalent]

@dpgeorge when I literally reboot the micro:bit it picks the same number every time. Yes when it starts up. I was hoping we can avoid having to call randint() twice if possible.

[dpgeorge]

Ok. I think the issue is that the random module uses the same PRNG sequence each time it starts up. This needs to be fixed so that it seeds itself from a true random source.

[mytechnotalent]

Any progress on this? I am working on many micro:bit tutorials but the random number generator is failing as stated?

[dpgeorge]

This should be fixed by b621de7 (I was not able to test it).

[jaustin]

@mytechnotalent Does the 'thumbs up' mean it works for you? Just want to be explicit before I close the issue, or go to test it myself :)

[mytechnotalent]

@jaustin my apologies! I did git checkout b621de7 and compile and test...

>>> randint(1, 5)
1
>>> randint(1, 5)
4
>>> randint(1, 5)
5
>>> randint(1, 5)
2
>>> 

@dpgeorge change did in fact fix. This is tested and good to merge to main.