Python/OpenCV script that displays snow

snow.py

import cv2
import numpy as np
import random

numSnowflakes = 2000
xSize, ySize = 1080, 1920

#cv2.namedWindow("window", cv2.WND_PROP_FULLSCREEN)
#cv2.setWindowProperty("window",cv2.WND_PROP_FULLSCREEN,cv2.WINDOW_FULLSCREEN)

def new_snowflake():
    xPosition = random.randint(0,ySize)
    yPosition = 0
    speed = random.random()+.01
    size = random.randint(0,3)
    c = random.randint(20,255)
    color = c,c,c
    snowflake = xPosition, yPosition, speed, size, color
    return snowflake

def draw_snowflakes(bg, snowflakes):
    for snowflake in snowflakes:
        center = snowflake[0:2]
        radius = snowflake[3]
        color = snowflake[4]
        cv2.circle(bg, tuple(np.array(center, int)), radius, color, -1)
    return bg

def move_snowflakes(snowflakes):
    newSnowflakes = []
    for snowflake in snowflakes:
        xPosition = snowflake[0]
        yPosition = snowflake[1] + snowflake[2]
        speed = snowflake[2] * 1.008
        newSnowflake = xPosition, yPosition, speed, snowflake[3], snowflake[4]
        if yPosition < ySize: newSnowflakes.append(newSnowflake)
        else: newSnowflakes.append(new_snowflake())
    return newSnowflakes
    
snowflakes = []
for i in range(numSnowflakes): snowflakes.append(new_snowflake())

while True:
    bg = np.zeros((xSize, ySize, 3), np.uint8)
    bg = draw_snowflakes(bg,snowflakes)
    cv2.imshow('window', bg)
    k = cv2.waitKey(1)
    if k == 27: break    
    snowflakes = move_snowflakes(snowflakes)    
cv2.destroyAllWindows()