How can I make random pick a sequence of three characters, but without repeating?

Question

Python

how to make it randomly give us all possible sequences of numbers 0-9, the entire English alphabet and "_" and not repeat

again, so that randomly gives us all sequences of 3 characters long

example:
s83
_s2
as5
an_
_as2
moi

Answer 1

Secondly, the concept of "non-recurring" excludes the concept of "random". By the very fact of tracking the repetition and controlling it, you contribute a share of the order.
In this case, it seems to me, "shuffle", shuffle is applicable.
Take numbers from 0 to 9 and shuffle random.shuffle()

import random

mylist = ["apple", "banana", "cherry"]
random.shuffle(mylist)

print(mylist)

Then you can take the first three from the shuffled list, and here you have 3 non-repeating random ones.
As for the third question, I recommend trying it yourself, then come with options for your attempts to solve a new question, and we will discuss. This is not the place to get solutions without difficulty.

Answer 2

from random import sample
from itertools import permutations