各位大神，帮我看看哪里有问题，搞了一天了，老提示错误

x1826417098

random_walk.py

from random import choice
class RandomWalk():
    def _init_(self,num_points=5000):
        self.num_points = num_points
        self.x_values = [0]
        self.y_values = [0]
    def fill_walk(self):
        while len(self.x_values) < 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
            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)


rw_visual.py

import matplotlib.pyplot as plt
from random_walk import RandomWalk
rw = RandomWalk()
rw.fill_walk()
plt.scatter(rw.x_values,rw.y_values,s=5)
plt.show()

c错误提示
Traceback (most recent call last):
  File "rw_visual.py", line 2, in <module>
    from random_walk import RandomWalk
  File "D:\python_work\cretive.py\random_walk.py", line 24, in <module>
    rw.fill_walk()
  File "D:\python_work\cretive.py\random_walk.py", line 8, in fill_walk
    while len(self.x_values) < len(self.num_points):
AttributeError: 'RandomWalk' object has no attribute 'x_values'

crossin先生

__init__
前后是各两个下划线，否则不会被程序自动调用

x1826417098

crossin先生 发表于 2020-10-21 19:00
__init__
前后是各两个下划线，否则不会被程序自动调用

多谢多谢，困扰很长时间了，仔细查阅了前面的笔记，的确是要两个下划线，再次感谢