学习用python绘制随机漫步图遇到的Error
#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(str(self.x_values)) < self.num_points:
x_direction = choice([1,-1])
x_distance = choice([0,1,2,3,4])
x_step = x_distance * x_direction
y_direction = choice([1, -1])
y_distance = choice([0, 1, 2, 3, 4])
y_step = y_distance * y_direction
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()
fig.ax = plt.subplots()
ax.scatter(rw.x_values,rw.y_values,s=15)
plt.show()
运行rw_visual.py结果
Traceback (most recent call last):
File "D:\projects\数据可视化\rw_visual.py", line 4, in <module>
rw.fill_walk()
File "D:\projects\数据可视化\random_walk.py", line 17, in fill_walk
next_x = self.x_values[-1] + x_step
~~~~~~~~~~~~~^^^^
TypeError: 'int' object is not subscriptable