diceRollHistogram

import random
from collections import defaultdict

def main():
    rolls = int(input("How many rolls? "))
    dice = int(input("How many dice? "))
    sides = int(input("How many sides per die? "))

    d = roll(dice,sides,rolls)

    h = make_histogram(d)

    display_output(d,h)

def roll(dice,sides,rolls):
    output_dict = defaultdict(int)
    for _ in range(rolls):
        output_dict[sum([random.randint(1,sides) for _ in range(dice)])] += 1
    return output_dict

def make_histogram(roll_array,total_symbols=80):
    total_rolls = sum([roll_array[i] for i in roll_array])
    output_array = defaultdict(int)
    for i in roll_array:
        output_array[i] = roll_array[i]*total_symbols/total_rolls
    return output_array

def display_output(d,h):
    total_rolls = sum([d[i] for i in d])
    for i in d:
        print('{:2d}{:10d}{:8.2%} {}'.format(i,d[i],d[i]/total_rolls,"#"*int(h[i])))

main()