import pygame
pygame.init()

WHITE = (255,255,255)
BLACK = (0,0,0)
SIZE = (500,500)
FPS = 60

sc = pygame.display.set_mode(SIZE)
clock = pygame.time.Clock()

x = SIZE[0] // 2
y = SIZE[1] // 2
R = 25
herospeed = 10
move = "NONE"
gamemode = 'menu'
isGameRunning = True
while isGameRunning:
    if gamemode  == 'game':
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                isGameRunning = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP:
                    move = "UP"
                if event.key == pygame.K_DOWN:
                    move = "DOWN"
                if event.key == pygame.K_LEFT:
                    move = "LEFT"
                if event.key == pygame.K_RIGHT:
                    move = "RIGHT"
            if event.type == pygame.KEYUP:
                move = "NONE"

        if move == "UP":
            y -= herospeed
        if move == "DOWN":
            y += herospeed
        if move == "RIGHT":
            x += herospeed
        if move == "LEFT":
            x -= herospeed

        sc.fill(BLACK)
        pygame.draw.circle(sc, WHITE, (x,y), R)
    if gamemode == 'menu':

    pygame.display.update()

    clock.tick(FPS)

pygame.quit()