def main():
x = [randint(1,100) for i in range(1,100)]
return x
This returns 100 random numbers btw 1 and 100. Each time I call the function, it returns a different sequence of numbers. What I want to, is to get the same sequence of numbers each time. maybe saving the results into sth?
You can provide some fixed seed.
import random
def main():
random.seed(9001)
x = [random.randint(1,100) for i in range(1,100)]
return x
For more information on seed: random.seed(): What does it do?
random.getstate() and then reset it with random.setstate()random.seed(9001) in the function itself. Putting it outside of it doesn't solve OP's problem.
main() is normally only called once per program invocation, as the entrypoint to the program. But of course the OP may not be adhering to that convention.Here's a basic example patterned after your code
import random
s = random.getstate()
print([random.randint(1,100) for i in range(10)])
random.setstate(s)
print([random.randint(1,100) for i in range(10)])
In both invocations, you get identical output. The key is, at any point you can retrieve and later reassign the current state of the rng.
randint from other places in your application. Another way could be to use random.Random class instance and set seed on itIn [19]: for i in range(10):
...: random.seed(10)
...: print [random.randint(1, 100) for j in range(5)]
...:
...:
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
[58, 43, 58, 21, 82]
The random.seed function has to be called just before a fresh call to random.
In [20]: random.seed(10)
In [21]: for i in range(10):
...: print [random.randint(1,10) for j in range(10)]
...:
[5, 6, 3, 9, 9, 7, 2, 6, 4, 3]
[10, 10, 1, 9, 7, 4, 3, 7, 5, 7]
[7, 2, 8, 10, 10, 7, 1, 1, 2, 10]
[4, 4, 9, 4, 6, 5, 1, 6, 9, 2]
[3, 5, 1, 5, 9, 7, 6, 9, 2, 6]
[4, 7, 2, 8, 1, 2, 9, 10, 5, 5]
[3, 3, 7, 2, 2, 5, 2, 7, 9, 8]
[5, 4, 5, 1, 8, 4, 4, 1, 5, 6]
[4, 9, 7, 3, 6, 10, 6, 7, 1, 5]
[5, 5, 5, 6, 6, 5, 2, 5, 10, 5]
pickleor just generate once and hardcode it in your program.pickleis directly related and generate once is not what is being asked.main()once each time you run a program. Do you want to get the same sequence of numbers each time the program is run?seedfunction.