Pygame: Snow Animation

#import pygame
import pygame
import random

#initialize game engine
pygame.init()

window_width=500
window_height=500

no_of_circles=100;
clock_tick_rate=20

#Open a window
size = (window_width, window_height)
screen = pygame.display.set_mode(size)

#Set title to the window
pygame.display.set_caption("Hello World")

dead=False

#Initialize values for color (RGB format)
WHITE=(255,255,255)
RED=(255,0,0)
GREEN=(0,255,0)
BLUE=(0,0,255)
BLACK=(0,0,0)

snow_list=[]

for i in range(no_of_circles):
    x = random.randrange(0, window_width)
    y = random.randrange(0, window_height)
    snow_list.append([x,y])

clock = pygame.time.Clock()

while(dead==False):
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            dead = True

    screen.fill(BLACK)

    for point in snow_list:
        point[1]+=1
        pygame.draw.circle(screen, WHITE, point, 2)

        if(point[1] >= window_height):
            point[0] = random.randrange(0, window_width)
            point[1] = random.randrange(-10, -5)

    pygame.display.flip()
    clock.tick(clock_tick_rate)

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