[PyGame] Need Help With My PYgame Script

[ghost0fkarma]

import pygame

pygame.init()

display_width = 800
display_height = 600

Black = (0, 0, 0)
White = (255, 255, 255)
Red = (255, 0, 0)

gameDisplay = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption('Racing Game')
clock = pygame.time.Clock()

ManImg = pygame.image.load('guy.jpg')

def Man(x,y):
        gameDisplay.blit(ManImg,(x,y))
x = (display_width * 0.45)
y = (display_height* 0.8)
x_change = 0

crashed = False

while not crashed:
        for event in pygame.event.get():
                if event.type == pygame.QUIT:
                        crashed = True
                if event.type == pygame.KEYDOWN:
                        if event.key == pygame.K_LEFT:
                                x_change = -5
                        elif event.key == pygame.K_RIGHT:
                                x_change = 5
                        if event.type == pygame.KEYUP:
                                event.key == pygame.K_RIGHT or event.key == pygame.K_LEFT
                                x_change = 0
        x += x_change        
        gameDisplay.fill(White)                
        Man(x,y)
        pygame.display.update()
        clock.tick(60)

pygame.quit()
quit()

        
                
        

When I press left or right my character will constantly move in that direction. How can I make it where when i let go of right or left the character stops where it is? I've already tried but its not seeming to work.