Matplotlib.axes.Axes.remove_callback() in Python

# Implementation of matplotlib function
import matplotlib.pyplot as plt
import numpy as np
import time

 
def update():
    plt.get_current_fig_manager().canvas.figure.patch.set_facecolor(str(np.random.random()))
    plt.draw()
    print("Draw at time :", time.time())
     
 
def start_animation():
     
    timer = fig.canvas.new_timer(interval = 50)
    w = timer.add_callback(update)
    timer.start()
    timer.remove_callback(w)
 
fig, ax = plt.subplots()
start_animation()
       
ax.set_title('matplotlib.axes.Axes.remove_callback() \
function Example', fontweight ="bold") 

plt.show()

# Implementation of matplotlib function  
from random import randint, choice 
import time 
import matplotlib.pyplot as plt 
import matplotlib.patches as mpatches 
   
   
back_color = "black"
colors = ['red', 'green', 'blue', 'purple'] 
width, height = 4, 4
   
fig, ax = plt.subplots() 
ax.set(xlim =[0, width], ylim =[0, height]) 
   
fig.canvas.draw()
ll = 1
   
def update():
    global ll
    x = randint(0, width - 1) 
    y = randint(0, height - 1) 
   
    arti = mpatches.Rectangle( 
        (x, y), 1, 1, 
        facecolor = choice(colors), 
        edgecolor = back_color 
    ) 

    ax.add_artist(arti)
     
    ax.draw_artist(arti) 

    fig.canvas.blit(ax.bbox) 
    print("Draw at time :", time.time())

    if ll > 10:
        timer.remove_callback(w)
    ll += 1
   
timer = fig.canvas.new_timer(interval = 1) 
w = timer.add_callback(update) 
timer.start()
       
ax.set_title('matplotlib.axes.Axes.remove_callback()\
function Example', fontweight ="bold") 

plt.show()