code

import pygame

# initializing pygame
pygame.init()

bg_color = (0, 200, 250)


# screen stuff
screen_height = 500
screen_width = 600
screen = pygame.display.set_mode((screen_width, screen_height))

# variables
speed_x = 0
speed_y = 0
pos_x = 400
pos_y = 300
background_color = (0, 200, 250)
radius = 15
color = (100, 100, 200)
spot = [pos_x, pos_y]
run = True
mouse_down = False

while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.MOUSEBUTTONDOWN:
            mouse_down = True
        if event.type == pygame.MOUSEBUTTONUP:
            mouse_down = False
    if mouse_down:
        speed_y = speed_y + 10
    speed_y = speed_y - 0.1
    screen.fill(background_color)
    pygame.draw.circle(screen, color, (spot[0],spot[1]), radius)
    spot[1] = spot[1] + speed_y

    pygame.display.update()

pygame.quit()