Particles… snow (with pygame)

Make some particles to simulate snow with pygame. Particles is an effect to see some visual effects made with tiny images. This is an “adaptation” of the code bt Rabbid76.

# pygame.math module
# https://www.pygame.org/docs/ref/math.html
#
# Pygame swap text with another text
# https://stackoverflow.com/questions/60944070/pygame-swap-text-with-another-text/60953697#60953697
#
# GitHub - PyGameExamplesAndAnswers - Draw 2D - Particles
# https://github.com/Rabbid76/PyGameExamplesAndAnswers/blob/master/documentation/pygame/pygame_2D.md

import pygame
import random

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

# list of particles
particles = []

def starting_point():
	" to make a flame like particles [150, 20] # flame, so that all circles with start at the same point"
	return random.randint(0, 300)
	# return 150

# the surface with the snow as a background
snow = pygame.image.load("snow.png")

def particles_generator():
    "This makes the circles move rfrom random start position at the top until bottome and the disappear"

    # Every particle starts at a random horizontal position at the top
    particles.append([
    	[starting_point(), 0],
    	[random.randint(0, 20) / 10 - 1, 2],
    	random.randint(4, 6)])

    # Every particle  moves... if particles[2] (the radius) is >= than 0 it is removed
    for particle in particles[:]:
        particle[0][0] += particle[1][0]
        particle[0][1] += particle[1][1]
        particle[2] -= 0.005 # how fast circles shrinks
        particle[1][1] += 0.01 # circles speed
        if particle[2] <= 0:
            particles.remove(particle)

    # draws a circle on the screen white, at x y corrds and with a ray of particle[2]
    for particle in particles:
        pygame.draw.circle(
        	window,
        	(255, 255, 255),
        	(
        		round(particle[0][0]),
        		round(particle[0][1])),
        		round(particle[2]))

def main():
    run = True
    while run:
        clock.tick(60)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
        # it adds particles until they are removed
        # if the size - [2] - is smaller than 0
        window.blit(snow, (0,0))
        particles_generator()
        pygame.display.flip()

    pygame.quit()
    exit()

main()