My Game | Python Fiddle

# Pygame template -skeleton for a new pygame project
import pygame
import random

WIDTH = 800
HEIGHT = 600
FPS = 30

# define colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

class Player (pygame.sprite.Sprite):
    # sprite for the player
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface((50, 50)) 
        self.image.fill(GREEN)
        self.rect = self.image.get_rect()
        self.rect.center = (WIDTH / 2, HEIGHT / 2)
        
     def update(self):
            self.rect.x += 5
            if self.rect.left > WIDTH:
                self.rect.right = 0
        
# initalize pygame and create window
pygame.init()
pygame.mixer.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_captain("My Game")
clock = pygame.time.Clock()

all_sprites = pygame.sprite.Group()
player = Player()
all_sprites.add(player)
#Game Loop
running = True
While runnig:
    # keep loop running at the right speed
    clock.tick(FPS)
    #Process input (events)
    for event in pygame.event.get():
        # check for closing window
        if event.type == pygame.QUIT:
            running = False
            
     # Update
     all_sprites.update()       
            
     #Draw / render
     screen.fill(BLACK)
     all_sprites.draw(screen)       
     # *after* drawing everything, flip the display
     pygame.display.flip()
            
pygame.quit()

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