如何在正确的时间将音乐添加到游戏中？

Question

The question may seem a bit strange, so I'll describe it better here:

I have managed to add a song to my game, and it works perfectly. The thing is that when I start the game after I click play in the menu the song starts to play, but the screen stays black and it won't switch to the game's screen. I have to click the exit button on the top right corner so it can exit the black screen and go to the game screen with the music still playing.

How do I make the music start playing after it has displayed the screen with the game, and not before?

You can see in iniciar() the code for the music to play

Thanks in advance fellow programmers!

# -*- coding: cp1252 -*-
import pygame
from pygame import init, display, Color, key, quit, joystick, time
from pygame.locals import *
from sys import exit
from tygame.main import StaticFrame, Button, Label, render_widgets, handle_widgets 
from Clase import *
import Funcion


def But_X_Y(size):

    global mylaby
    global perso

    mylaby = laby(size[0], size[1])
    mylaby.generate_laby()
    perso = Perso(mylaby)

def But_path():

    global perso

    perso.che_jaune = []
    perso.reverse = 0
    perso.astar(((perso.laby.w - 1), (perso.laby.h - 1)))
    camino = perso.get_astar((perso.x, perso.y), ((perso.laby.w - 1), (perso.laby.h - 1)))
    perso.go_to(chemain)


def iniciar():
    done = False
    clock = pygame.time.Clock()
    pygame.mixer.music.load('cod4.mp3')
    pygame.mixer.music.set_endevent(pygame.constants.USEREVENT)
    pygame.mixer.music.play()
    while not done:
        for event in pygame.event.get(): 
            if event.type == pygame.QUIT: 
                done = True 
            elif event.type == pygame.constants.USEREVENT:
                pygame.mixer.music.load('cod4.mp3')
                pygame.mixer.music.play()
        clock.tick(20)
    width, height = 720, 480
    Window = display.set_mode((width, height)) 
    pygame.init()

    display.set_caption("El laberinto mas pelado del mundo")
    mylaby = laby(25, 30)
    mylaby.generate_laby()
    perso = Perso(mylaby)
    perso_time = 0
    lista3 = Funcion.lista1(width, height)
    lista2 = Funcion.lista2(lista3)
    key.set_repeat(50, 55)


    while True:

        time.Clock().tick(30)
        Window.fill(const.Porange)    

        for event in handle_widgets():
            if event.type == QUIT:
                quit()
                exit()


        flechas = key.get_pressed()
        if flechas:
            if flechas[K_UP]:
                if not perso.che_jaune:
                    perso.move(const.arriba)
            if flechas[K_DOWN]:
                if not perso.che_jaune:
                    perso.move(const.abajo)
            if flechas[K_LEFT]:
                if not perso.che_jaune:
                    perso.move(const.izquierda)
            if flechas[K_RIGHT]:
                if not perso.che_jaune:
                    perso.move(const.derecha)


        if time.get_ticks() - perso_time >= const.time_perso_poll:
            perso_time = time.get_ticks()
            perso.poll()


        perso.show(Window)
        render_widgets()

        pygame.display.flip()



        if perso.x == perso.laby.w - 1 and perso.y == perso.laby.h - 1:
            time.delay(300)       

            for Bip in lista2:
                Bip.show(Window)
                display.flip()                     


            mylaby = laby(50, 50)
            mylaby.generate_laby()
            perso = Perso(mylaby)

            while True:
                Window.fill(const.Pblue)
                perso.show(Window)
                render_widgets()

                if not lista2: break

                i = 0
                while i < 24:
                    lista2.remove(choice(lista2))  
                    i += 1


                for Bip in lista2:
                    Bip.show(Window)

                display.flip()

            lista2 = Fonction.fill_lista2(lista3)

Answer 1

Just remove this part

while not done:
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            done = True 
        elif event.type == pygame.constants.USEREVENT:
            pygame.mixer.music.load('cod4.mp3')
            pygame.mixer.music.play()
    clock.tick(20)

from the iniciar function.

What's the point of this loop anyway (other than causing the behaviour you don't want)?