python

import matplotlib.pyplot as plt
from random import choice

class RandomWalk():
    def init(self,num_points=50000):
        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_directionx_distance
            y_direction=choice([1,-1])
            y_distance=choice([0,1,2,3,4])
            y_step=y_directiony_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)
while True:
    rw=RandomWalk()
    rw.fill_walk()
    point_numbers=list(range(rw.num_points))
    #edgecolor='none'删除每个点周围的轮廓
    plt.scatter(rw.x_values,rw.y_values,c=point_numbers,cmap=plt.cm.Blues,edgecolors='none',s=1)
    plt.scatter(0,0,c='green',edgecolors='none',s=100)
    plt.scatter(rw.x_values[-1],rw.y_values[-1],c='red',edgecolors='none',s=100)
    plt.axes().get_xaxis().set_visible(False)
    plt.axes().get_yaxis().set_visible(False)
    plt.tick_params(axis="both",labelsize=15)
    plt.show()
    keep_running=input("Make another work?(y/n):")
    if keep_running=='n':
        break