Can't create and run class why? [duplicate] - python-3.x

Question

I have a simple Pygame program:
#!/usr/bin/env python
import pygame
from pygame.locals import *
pygame.init()
win = pygame.display.set_mode((400,400))
pygame.display.set_caption("My first game")
But every time I try to run it, I get this:
pygame 2.0.0 (SDL 2.0.12, python 3.8.3)
Hello from the pygame community. https://www.pygame.org/contribute.html
And then nothing happens.
Why I can't run this program?

Answer 1

Your application works well. However, you haven't implemented an application loop:
import pygame
from pygame.locals import *
pygame.init()
win = pygame.display.set_mode((400,400))
pygame.display.set_caption("My first game")
clock = pygame.time.Clock()
run = True
while run:
# handle events
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
# update game objects
# [...]
# clear display
win.fill((0, 0, 0))
# draw game objects
# [...]
# update display
pygame.display.flip()
# limit frames per second
clock.tick(60)
pygame.quit()
The typical PyGame application loop has to:
handle the events by calling either pygame.event.pump() or pygame.event.get().
update the game states and positions of objects dependent on the input events and time (respectively frames)
clear the entire display or draw the background
draw the entire scene (blit all the objects)
update the display by calling either pygame.display.update() or pygame.display.flip()
limit frames per second to limit CPU usage with pygame.time.Clock.tick
repl.it/#Rabbid76/PyGame-MinimalApplicationLoop See also Event and application loop

Answer 2

This is interesting. Computer read your program line by line[python]. When all the line are interpreted, the program closed. To solve this problem you need to add a while loop to make sure the program will continue until you close the program.
import pygame,sys
from pygame.locals import *
pygame.init()
pygame.display.set_caption("My first game")
win = pygame.display.set_mode((400,400))
#game loop keeps the game running until you exit the game.
game_running=True
while game_running:
for event in pygame.event.get():
if event.type==QUIT:
pygame.quit()
sys.exit()
win.fill((0, 250, 154)) #Fill the pygame window with specific color. You can use hex or rgb color
pygame.display.update() #Refresh the pygame window
You can check more pygame Examples.
https://github.com/01one/Pygame-Examples
I think this will be helpful.