Бинарное дерево с отрисовкой

from tkinter import *
from random import randrange as rnd

win = Tk()
win.geometry('800x800')
canv = Canvas(bg='white')
canv.pack(fill=BOTH,expand=1)

m = 30
x0 = 400
y0 = 50

class Node():
    def __init__(self,value):
        self.value = value
        self.left = None
        self.right = None

    def __str__(self):
        return str(self.value)


def add_node(node,value):
    if value > node.value:
        if node.right:
            add_node(node.right,value)
        else:
            node.right = Node(value)
    else:
        if node.left:
            add_node(node.left,value)
        else:
            node.left = Node(value)

def paint_node(node,x,y,w):
    r = m/2
    canv.create_oval(x-r,y-r,x+r,y+r)
    if node.value:
        canv.create_text(x,y,text = node.value, font = 'Tahoma 14')
    if node.left:
        canv.create_line(x,y,x-w/2,y+m)
        paint_node(node.left,x-w/2,y+m,w/2)
    if node.right:
        canv.create_line(x,y,x+w/2,y+m)
        paint_node(node.right,x+w/2,y+m,w/2)


root = Node(10)
values = [x for x in range(100)]

for i in range(10):
    i = rnd(len(values))
    add_node(root,values.pop(i))


paint_node(root,x0,y0,600)


mainloop()