python绘制5000个点的随机漫游图

为什么代码运行后图片无法显示啊，代码如下

import matplotlib.pyplot as pt
from random import choice

class RandomWalk:

def __init__(self,point=5000):
    self.point=point
    self.x=[0]
    self.y=[0]

def walktrace(self):
        while len(self.x)<self.point:
            self.xdirection=choice([-1,0,1])
            self.xstep=choice([1,2,3,4,5])
            self.xtrace=self.xdirection*self.xstep
            x=self.x[-1]+self.xtrace
 
            self.ydirection=choice([-1,0,1])
            self.ystep=choice([1,2,3,4,5])
            self.ytrace=self.ydirection*self.ystep
            y=self.y[-1]+self.ytrace

            self.x.append(x)
            self.y.append(y)

def draw(self):    
    fig,ax=pt.subplots()  
    ax.scatter(self.x,self.y,c='red',s=10)
    pt.show()

本地能正常实现，建议贴下调用部分