[Python] Delay button appearance, random start of levels when it is pressed [duplicate]

There are several levels in the game, how to make it so that when you press the "ButtonB" button, one of the levels is launched randomly (beginning (beginning2) randomly (later they will be filled with questions (quiz) and there will be at least 10 of them). I tried to do it with random numbers, transferred the levels to a separate file.py, and also tried to specify just def-s (levels) or classes, but nothing worked.

That's the problem. Following the documentation and the Internet, I did it the same way as with numbers, only I placed the level either in a separate scene or class. But unfortunately, nothing worked.

import pygame
import sys
import pygame.time
import pygame.locals
from Button import ImageButton

pygame.init()

screen = pygame.display.set_mode((1280, 780))
bg = pygame.image.load("image/result_Фон11.png")
bg2 = pygame.image.load("image/result_Фон2.png")
bg3 = pygame.image.load("image/Презентация.png")
bg4 = pygame.image.load("image/result_Фон2 (размытый).png")
pygame.display.set_caption("Соучастие в преступлении")
icon = pygame.image.load("image/Icon/crowd-80.png")
pygame.display.set_icon(icon)
clock = pygame.time.Clock()

def main_menu():

def start():

image = pygame.image.load("image/Airbrush-ARDUWgv8Nwg-Photoroom.png")
imageD = pygame.image.load("image/Dio.png")
myfond = pygame.font.Font('Font/Lilita One Regular.ttf', 20)
text_surfaceS = myfond.render('Нужна твоя помощь!', True, 'Black')

myfond = pygame.font.Font('Font/Lilita One Regular.ttf', 20)
text_surfaceSo = myfond.render('Поступило сообщение', True, 'Black')
ButtonB = ImageButton(1180, 360, 100, 100, "", "image/Button/стрелка-вправо.png",
"image/Button/стрелка-вправо цвет.png")

running = True
while running:
screen.fill((0, 0, 0))
screen.blit(bg4, (0, -90))
screen.blit(image, (40, 270))
screen.blit(imageD, (450, 50))
screen.blit(text_surfaceS, (590, 80))
screen.blit(text_surfaceSo, (590, 100))

ButtonB.check_hover(pygame.mouse.get_pos())
ButtonB.draw(screen)

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

ButtonB.handle_event(event)
if event.type == pygame.USEREVENT and event.button == ButtonB:
beginning()

pygame.display.flip()

def pr():

myfond = pygame.font.Font('Font/PassionsConflictRUS-Regular.otf', 50)
text_surfacePr = myfond.render('Проект направлен на формирование ...', True, 'Black')

running = True
while running:
screen.fill((0, 0, 0))
screen.blit(bg3, (0, -90))
screen.blit(text_surfacePr, (60, 60))

for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
sys.exit()

pygame.display.update()

def beginning():

running = True
while running:

screen.fill((0, 0, 0))
screen.blit(bg2, (0, -90))

for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
sys.exit()

pygame.display.flip()

def beginning2():

running = True
while running:

screen.fill((0, 0, 0))
screen.blit(bg2, (0, -90))

for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
sys.exit()

pygame.display.flip()

if __name__ == "__main__":
main_menu()

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