生成svg文件时报错，希望有人知道错误原因
写了一个掷骰子的代码，希望生成柱状图，但最后生成的svg文件是0kb。代码如下：from random import randint
class Die():
"""a class of die"""
def __init__(self,num_sides=6):
"""default 6 sides"""
self.num_sides = num_sides
def roll(self):
"""return a random number between 1 and die's sides"""
return randint(1,self.num_sides)
…………………………………………………………
from die import Die
import pygal
#create a D6
die = Die()
#roll die a few times and restore result in a list
results = []
for roll_num in range(6000):
result = die.roll()
results.append(result)
#analsis result
frequencies = []
for value in range(1,die.num_sides+1):
frequency = results.count(value)
frequencies.append(frequency)
#visualize result
hist = pygal.Bar()
hist.title = "Results of rolling one D6 6000 times."
hist.x_labels = ['1','2','3','4','5','6']
hist.x_title = ["Result"]
hist.y_title = "Frenquency of Result"
hist.add('D6',frequencies)
hist.render_to_file('die_visual.svg')
发生了报错，报错代码如下：
Traceback (most recent call last):
File "die_visual.py", line 29, in <module>
hist.render_to_file('die_visual.svg')
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\ghost.py", line 165, in render_to_file
f.write(self.render(is_unicode=True, **kwargs))
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\ghost.py", line 121, in render
return (self
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\ghost.py", line 114, in make_instance
self._last__inst = self.cls(
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\graph\bar.py", line 37, in __init__
super(Bar, self).__init__(*args, **kwargs)
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\graph\base.py", line 74, in __init__
self._draw()
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\graph\base.py", line 291, in _draw
self._compute_margin()
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\graph\base.py", line 159, in _compute_margin
self.x_title = split_title(
File "C:\Users\asus\AppData\Roaming\Python\Python38\site-packages\pygal\util.py", line 435, in split_title
title_lines = title.split("\n")
AttributeError: 'list' object has no attribute 'split'
没用过这个库，不过这个似乎应该去掉[]:
hist.x_title = "Result"
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