Using python, create continuously falling snow.

pygame_snow2.py

import pygame
import random

# Define some colors
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
BLUE = (0, 0, 255)

pygame.init()

# Set the width and height of the screen [width, height]
size = (700, 500)
screen = pygame.display.set_mode(size)

pygame.display.set_caption("Snow")


class SnowFlake():
    '''
    screen, WHITE, snow_list[i], 2  
    '''

    def __init__(self, size, position, wind=False):
        self.size = size
        self.position = position
        self.wind = wind
    
    
    def fall(self, speed):
        """
        Take in a integer that represnts the speed at which the snowflake is falling in the y-direction.  
        A positive integer will have the snowflake falling down the screen. 
        A negative integer will have the snowflake falling up the screen. 
        
        If wind = True
            - the x direction of the snowflake changes
        """
#[x,y]
        #self.position[0] += speed               #x position     
        self.position[1] += speed               #y position

        
    def draw(self):
        """
        Uses pygame and the global screen variable to draw the snowflake on the screen
        """
        pygame.draw.circle(screen, WHITE, self.position, self.size)

# Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()



# Speed
speed = 1
#y_position = 0


#INITIALIZE YOUR SNOWFLAKE HERE! 

# Snow List
snow_list = []

# -------- Main Program Loop -----------
while not done:
    # --- Main event loop
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True

    # --- Game logic should go here

    # --- Screen-clearing code goes here

    # Here, we clear the screen to white. Don't put other drawing commands
    # above this, or they will be erased with this command.

    # If you want a background image, replace this clear with blit'ing the
    # background image.
    screen.fill(BLACK)

    # --- Drawing code should go here
    # Begin Snow

    y_position = 0 #makes it look like it only stays at 0
    x_position = random.randint(0,700)

    speed = 1
    y_position += speed

    flake = SnowFlake(2, [x_position, y_position], False)


    snow_list.append(flake)

    for flake in snow_list:
        flake.draw()  
        flake.fall(speed) #def fall (self, speed):


     



    


    # End Snow
    # --- Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

    # --- Limit to 60 frames per second
    clock.tick(60)

# Close the window and quit.
pygame.quit()
exit() # Needed when using IDLE