UDP client (pixels lost)

# UDP client with pixels lost of an image
from PIL import Image
import pickle
import socket
from time import sleep
from random import randint


udp_client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

image = Image.open("DR-2.3-smiley.bmp")   # Image of test

width, height = image.size
pixels_lost = 0

width, height = image.size
print("Image size: " + str(width) + " " + str(height))
#print(width, height)

size = width * height
print("Pixels to be sent: " + str(size))

message = str(size)
data = message.encode()
udp_client.sendto(data, ("127.0.0.1", 20001))

for y in range(height):
    for x in range(width):
        pos = (x, y)
        rgba = image.getpixel(pos)
        message = (pos, rgba)
        data = pickle.dumps(message)
        if randint(0,9) > 0:   # random error generator
            udp_client.sendto(data, ("127.0.0.1", 20001))
        else:
            pixels_lost += 1
        sleep(0.001)

message = ((9,9), (0,0,0,0))

data = pickle.dumps(message)
udp_client.sendto(data, ("127.0.0.1", 20001))