music_game.py

import time

import pygame

WHITE = 255, 255, 255
BLACK = 0, 0, 0

whole_note_image = pygame.Surface((20, 20))
whole_note_rect = whole_note_image.get_rect()
whole_note_image.fill(WHITE)
pygame.draw.circle(whole_note_image, BLACK, whole_note_rect.center, 10, 3)


class Note(pygame.sprite.Sprite):

    def __init__(self, x, y):
        super().__init__()
        self.image = whole_note_image
        self.rect = whole_note_image.get_rect()
        self.x = x
        self.y = y
        self.speed = 50

    def update(self, time_delta):
        self.x += self.speed * time_delta
        self.rect.center = int(self.x), int(self.y)


def main():
    pygame.init()

    display = pygame.display.set_mode((400, 400))
    running = True

    group = pygame.sprite.Group()
    note = Note(200, 200)
    group.add(note)

    last_frame = time.time()
    while running:
        this_frame = time.time()
        time_delta = this_frame - last_frame
        last_frame = this_frame

        for e in pygame.event.get():
            if e.type == pygame.QUIT:
                running = False
        group.update(time_delta)
        display.fill(WHITE)  # Fill the background
        group.draw(display)
        pygame.display.update()

    pygame.quit()


if __name__ == "__main__":
    main()