pygame: creating window display freezes everything

Question

I've seen a number of similar questions out there, but none of the solutions have worked for me. This is incredibly simple, so perhaps I'm overlooking something trivial.

My code (create a display window in pygame):

import pygame
pygame.init()

win = pygame.display.set_mode((500, 500))

When I run this file from the terminal (python file_name.py) the entire screen freezes and I have to reboot (power off my virtual machine). However, if I write these lines of code in python within the terminal directly, the window pops open as it should. What's the deal with that?

What I've tried: Putting the last line a while loop, putting this into a main function, and using time.sleep() to delay before the program ends.

python 3.7.4, pygame 2.0.0, Debian 10.3.0 (running within virtualBox 6.1)

score 1 · Answer 1 · answered Dec 20 '20 at 10:58

Your application works well. However, you haven't implemented an application loop:

import pygame
pygame.init()

win = pygame.display.set_mode((500, 500))
clock = pygame.time.Clock()

run = True
while run:
    clock.tick(60)
    
    # 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()

pygame.quit()

The typical PyGame application loop has to:

handle the events by 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 either pygame.display.update() or pygame.display.flip()

repl.it/@Rabbid76/PyGame-MinimalApplicationLoop See also Event and application loop

pygame: creating window display freezes everything

1 Answers1