How can i make a shuffler without using modules or built in functions

Question

What i have to keep in mind if I want to shuffle an array .
What are the different techniques of shuffling and how to choose between them

Answer 1

If you aren't even supposed to use random module, you'd have to implement your own pseudo random number generator.

Sounds like quite a project.

https://en.m.wikipedia.org/wiki/Pseudorandom_number_generator

Answer 2

i would think recursion and indexing. mabey even a loop and indexing. Only way to find out is to start coding!

And is this just to learn? Whats so bad about:

import random as r
a = [1,2,3,4]
print(r.shuffle(a))

Answer 3

Thank you all