“class”has no attritude 有大佬可以解答一下吗

请问“class”object has no attribute 是怎么回事啊 

from random import choice


class Random_walk:
def __init__(self):
self.num_points = 500
self.x_values = []
self.y_values = []

def fill_walk(self):
x = self.num_points
while len(self.x_values) < int(self.num_points):
x_direction = choice([1, -1])
x_distance = choice([0, 1, 2, 3, 4])
x_step = x_direction * x_distance

y_direction = choice([1, -1])
y_distance = choice([0, 1, 2, 3, 4])
y_step = y_direction * y_distance

if x_step == 0 and y_step == 0:
continue

elif self.x_values == [] or self.y_values == []:
self.x_values.append(x_step)
self.y_values.append(y_step)

else:
next_x = self.x_values[-1] + x_step
next_y = self.y_values[-1] + y_step

self.x_values.append(next_x)
self.y_values.append(next_y)


import matplotlib.pyplot as plt

rw = Random_walk()
rw.fill_walk()
plt.scatter(rw.x_values, rw.y_values, s=25)
plt.show()

把def __init__(self，num_points=500):改为def __init__(self):

self.x_values，这个类到底有没有x_values这个变量，检查一下，别拼写错误

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