python - Why is nothing drawn in PyGame at all?

Question

i have started a new project in python using pygame and for the background i want the bottom half filled with gray and the top black. i have used rect drawing in projects before but for some reason it seems to be broken? i don't know what i am doing wrong. the weirdest thing is that the result is different every time i run the program. sometimes there is only a black screen and sometimes a gray rectangle covers part of the screen, but never half of the screen.

import pygame, sys
from pygame.locals import *
pygame.init()

DISPLAY=pygame.display.set_mode((800,800))
pygame.display.set_caption("thing")
pygame.draw.rect(DISPLAY, (200,200,200), pygame.Rect(0,400,800,400))

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

Answer 1

You need to update the display. You are actually drawing on a Surface object. If you draw on the Surface associated to the PyGame display, this is not immediately visible in the display. The changes become visibel, when the display is updated with either pygame.display.update() or pygame.display.flip().

See pygame.display.flip():

This will update the contents of the entire display.

While pygame.display.flip() will update the contents of the entire display, pygame.display.update() allows updating only a portion of the screen to updated, instead of the entire area. pygame.display.update() is an optimized version of pygame.display.flip() for software displays, but doesn't work for hardware accelerated displays.

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 (draw 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

import pygame
from pygame.locals import *
pygame.init()

DISPLAY = pygame.display.set_mode((800,800))
pygame.display.set_caption("thing")
clock = pygame.time.Clock()

run = True
while run:
    # handle events
    for event in pygame.event.get():
        if event.type == QUIT:
            run = False

    # clear display
    DISPLAY.fill(0)

    # draw scene
    pygame.draw.rect(DISPLAY, (200,200,200), pygame.Rect(0,400,800,400))

    # update display
    pygame.display.flip()

    # limit frames per second
    clock.tick(60)

pygame.quit()
exit()

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