Simple simulation of rolling dice

dice_roll.py

#!/usr/bin/env python
# Python 3.x

import random

rolls = 5000  # the more results the better
scaling = 10  # scale the histogram to fit the screen

dice = (20,)  # a single d20
#dice = (6, 6)  # two d6s

results = dict()

for roll in range(rolls):
    sum = 0
    for die in dice:
        sum += random.randint(1, die)
    results[sum] = results.get(sum, 0) + 1

for result_key in sorted(results):
    print("{value:-2} : {bar}".format(value=result_key,
                                      bar="#" * int(results[result_key] / scaling)))