ПОЧЕМУ МОДЕЛЬКА ПРЫГАЕТ БЕСКОНЕЧНО ПРИ НАЖАТИЕ SPACE
import pygame

pygame.init()
win = pygame.display.set_mode((500,500))

pygame.display.set_caption("VLAD.EXE")

x = 50
y = 425
wight = 40
height = 60
speed = 10
isJump = False
JumpCount = 10

run = True
while run:
    pygame.time.delay(50)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run= False

    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT] and x > 5:
        x -= speed
    if keys[pygame.K_RIGHT] and x < 500 - wight - 5:
        x += speed
    if not(isJump):
        if keys[pygame.K_UP] and y > 5:
            y -= speed
        if keys[pygame.K_DOWN] and y < 500 - wight - 15:
            y += speed
        if keys[pygame.K_SPACE]:
            isJump = True
    else:
        if  JumpCount >= -10:
            if JumpCount < 0:
                 y += (JumpCount ** 2) / 2
            else:
                y -= (JumpCount ** 2) / 2
            JumpCount -= 1

        else:
            isJamp = False
            JumpCount = 10


    win.fill((0, 0, 0))
    pygame.draw.rect(win, (0, 0, 250), (x, y, wight, height))
    pygame.display.update()
pygame.quit()