The math module holds the usual functions for numbers, and random makes pseudo-random choices.

import math

print(math.sqrt(16), math.pi)
print(math.floor(2.7), math.ceil(2.1))
print(math.hypot(3, 4))      # 5.0
print(math.dist((0, 0), (1, 1)))
print(math.prod([2, 3, 4]))  # 24

math.floor rounds down and math.ceil rounds up, and both return an int. math.dist measures a straight line between two points.

import random

rng = random.Random(7)
print(rng.randint(1, 6))     # 1 to 6
print(rng.choice(["a", "b"]))
print(rng.random())          # below 1

A seed fixes the sequence: random.Random(7) makes the same choices on every run, which tests need. randint(a, b) includes both ends, unlike range. Make your own Random object instead of calling random.seed, which resets the generator that every other part of the program shares.

Write roll_dice(n, seed) returning a list of n six-sided die rolls made with its own random.Random(seed), without touching the shared generator. Write distance(a, b) returning the straight-line distance between two (x, y) points.

The explanation opens here once every check passes.