how to only using seed once for the entire program ?

Question

so i did a test
https://code.sololearn.com/ckbqiyArECcg/?ref=app

is there any efficent way other than calling seed each time i need it ? i have several random number that i need to get based on the seed given.

something like what we can toggle ourself, from using and not using seed.

Answer 1

its soo messy like really messy, but the flow goes like this.
i have some lists

listA
listB
listC

then i generate a seed, by using randint
xseed = randint(100,1000)

then i shuffle the list using that seed.

what i looking for is to only use seed() once but will affect all the shuffle operation onwards.

my current code looks like

seed(xseed)
shuffle(listA)
#dosomething else
seed(xseed)
shuffle(listB)
#dosomething else
...

i looking for a solution like this

seed_once(xseed)
shuffle(listA)
#dosomething else
shuffle(listB) #but still affected from previous seed
#dosomething else
...

reset_seed() #to put back the normal randomizer

as why i need it is, seed() is pretty small line, when working on large source code i can easily miss them and mess with the result.

Answer 2

Can you eplain what you want to do exactly ?

Answer 3

as in my code

i want the output looks like the second one.
but only using seed once like the first one

Answer 4

Then why din't you create just one sample, and print it 10 times ? I'm confused, why do you want to print the same sample 10 times ?

Answer 5

its just a simplified case, the one i working on right now consist of a bunch of lists.

Answer 6

Then can you share the one you are working on ? Most people will probably wonder the same thing, cause simplfied case means simplfied solution, which is not what you're looking for obviously

Answer 7

Generators for random numbers usually have an internal state that you can retrieve and set. In case of Python, that would be the getstate() and setstate() function:
https://docs.python.org/3/library/random.html

Using that state, you could do it the following way:
https://code.sololearn.com/c4mOb369U3O1/?ref=app

I don't really know Python, but this is a common thing in many languages, so this would be a possibility.

Answer 8

Iam not sure if I fully understand what you want to do, but I guess you want to shuffle all the lists using the seed or 'order', if that is the case, why don't you shuffle the lines, and then remake the lists ? It will look like this (assuming all the list have the same lenght):
lists = [listA, listB, listC]
L = [[lst[index] for lst in lists] for index in range(len(lists[0]))]
r = random.randint(100, 1000) # useless, remove this line
seed(r) # useless, remove this line
shuffle(L)
result = [[lst[index] for lst in L] for index in range(len(L[0]))]

But as you can see here, the random.seed is useless since it's generated from a ranfom number, so just remove it, I hope this is the result you want

Answer 9

by using seed i can expect the result of random.
so the seed are act kinda like a key. i store the seed somewhere else to be used later in the program.

Answer 10

Then use seed

Answer 11

so back to my original question.
seed only affect once, i need to call it again and again each time i need it.

my question is there any way use seed without calling seed() over and over again

Answer 12

No there isn't, because seed is a sequence, there is no other way to reset that sequence without using another intermediate function

Answer 13

ah thx then