Python编程：从入门到实践，课后题15-7

啊，第十五章又比较简单了，我这次注意了多加空格，看起来可能不那么难受了。

import pygal
from random import randint

class Die():
def __init__(self, num_sides=8):
self.num_sides = num_sides
def roll(self):
return randint(1,self.num_sides)

die_1 = Die()
die_2 = Die()

results = []
for roll_number in range(1,1000):
result = die_1.roll() + die_2.roll()
results.append(result)

hist=pygal.Bar()
hist.title = "Results of rolling two D8 dice 1000 times"
frequencies = []
labels = []
max_result = die_1.num_sides+die_2.num_sides
for value in range(2,max_result+1):
frequency = results.count(value)
frequencies.append(frequency)
label = str(value)
labels.append(label)

hist.x_labels = labels
hist.x_title = "Result"
hist.y_title = "frequency of result"

hist.add('D8+D8',frequencies)
hist.render_to_file('dice_visual.svg')