import pygame

pygame.init()
screen = pygame.display.set_mode([500, 800])
run = True
step = 0.3
character = [250, 400]
size = 30
sneak = False
move_left = False
move_right = False
move_top = False
move_bottom = False
while run:
    #JanekJaran#3102
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_a:
                move_left = True
            if event.key == pygame.K_d:
                move_right = True
            if event.key == pygame.K_w:
                move_top = True
            if event.key == pygame.K_s:
                move_bottom = True
            if event.key == pygame.K_x:
                sneak = True
                step = 0.12
                size = 20
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_a:
                move_left = False
            if event.key == pygame.K_d:
                move_right = False
            if event.key == pygame.K_w:
                move_top = False
            if event.key == pygame.K_s:
                move_bottom = False
            if event.key == pygame.K_x:
                sneak = False
                step = 0.3
                size = 30
    if move_left:
        if character[0]>0:
            character[0] -= step
    if move_right:
        if character[0] < 500:
            character[0] += step
    if move_top:
        if character[1] > 0:
            character[1] -= step
    if move_bottom:
        if character[1] < 800:
            character[1] += step
    screen.fill((255, 255, 255))
    pygame.draw.circle(screen, (0, 255, 0), character, size)
    pygame.display.flip()

pygame.quit()