random dice and stuff.py

#!/usr/bin/env python3

from random import randint


dice = 2           # two dice
die = 20           # d20
rolls = 10000000   # roll this many times
f = min            # low roll == min, high roll == max

rolled = sum = 0

while rolled < rolls:
    rolled += 1
    sum += f((randint(1, die) for _ in range(dice)))

print("Average roll: ", sum / rolled)