main.py

import pygame, sys
import random

class Runner():
    __customes = ("turtle", "fish", "prawn", "moray", "octopus")
    def __init__(self, x=0, y=0):
        ixCustome =random.randint(0,4)
        
        self.custome =pygame.image.load("images/{}.png".format(__self.customes[ixCustome]))
        self.position = [x,y]
        self.name = ""
        
    def avanzar (self):
        self.position [0] += random.randint (1,6)

class Game():
    runners= []
    __posY= (160, 200, 240, 280)
    __names= ("Speedy", "Lucera", "Alonso", "Torcuata")
    __startLine=-5
    __finishLine =620
    
    def __init__(self):
        self.__screen = pygame.display.set_mode((640, 480))
        self.__background = pygame.image.load("images/background.png")
        pygame.display.set_caption ("Carrera de bichos")
        
        for i in range (4):
            theRunner = Runner (self.__startLine,self.__posY[i])
            theRunner.name = self.__names[i]
            self.runners.append(theRunner)
    
        
    def competir (self):
        gameOver =False
        #comprobamos eventos
        while not gameOver:
            for event in pygame.event.get():
                if event.type== pygame.QUIT:
                    gameOver =True
                    
            #actualizamos codigo
            for activeRunner in self.runners:
                active.Runner.avanzar()
                if activeRunner.position[0] >= self.__finishLine:
                    print ("{} ha ganado".format(activeRunner. name))
                    
            # Refrescamos la pantalla
            self.__screen.blit(self.__background, (0,0))
            
            for runner in self.__runners:
                self.__screen.blit(runner.costume, runner.position)

            pygame.dispay.flip()
            
        #En el momento que tenemos un ganador cerramos programa    
        while True:
            for event in pygame.event.get():
                if event.type==pygame.QUIT():
                    pygame.quit()
                    sys.exit
        
        
if __name__== "__main__":
    
    game = Game()
    pygame.font.init()
    game.competir()