Develop Reference

Pygame always showing a black screen

I am trying to recreate this pygame but i keep getting a black screen without anything displayed. I get no error's so i don't know where i need to start.
import pygame
from sys import exit
pygame.init()
screen = pygame.display.set_mode((800, 400))
pygame.display.set_caption("Runner")
clock = pygame.time.Clock()
test_surface = pygame.image.load('graphics/Sky.png')
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
exit()
screen.blit(test_surface,(0, 0))
pygame.display.update()
clock.tick(60)

The problem got solved after reinstalling python and pycharm. Not sure if both were needed but it did the trick for me, thanks all.

for some reason, python not responding when i quit it(mac)

for some reason, python did not respond when I quit it
screenshot of python didn't respond
import pygame
pygame.init()
size=(320, 320)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("space invader")
icons=pygame.image.load('info.png')
pygame.display.set_icon(icons)
running=True
def player():
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running=False
pygame.display.quit()
pygame.quit()
do you have any idea what the freak is happening here?

It is not clear what exactly the question is trying to achieve other than to run to its end. The code was missing necessary indentation, this works:
import pygame
pygame.init()
size=(320, 320)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("space invader")
icons=pygame.image.load('info.png')
pygame.display.set_icon(icons)
running=True
def player():
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running=False
pygame.display.quit()
pygame.quit()
I would still point out that the function player() needs to be called somewhere presumably...

why do I get the error: pygame.error: video system not initialized

Like the title says I am confused why I get the error: pygame.error: video system not initialized
As far as i understand this error is raised if you forget to initialize your code with pygame.init() but I did, here's my code and thanks in advance:
import pygame
from pygame.locals import *
pygame.init()
screen_height = 700
screen_width = 1000
screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("platformer")
# load images
sun_img = pygame.image.load("img/sun.png")
backround_img = pygame.image.load("img/sky.png")
run = True
while run:
screen.blit (backround_img,(0,0))
screen.blit(sun_img, (100, 50))
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
pygame.quit()
pygame.display.update()
the error does not crash the window or anything and it works as intended
its just somewhat annoying.

for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
pygame.quit()
pygame.display.update()
When the event loop happens, if you close the window, you call pygame.quit(), which quits pygame. Then it tries to do:
pygame.display.update()
But pygame has quit, which is why you are getting the message.
separate the logic out. Events in one function or method, updating in another, and drawing and updating the display in another to avoid this.

Pygame exiting fullscreen mode sets window outside screen

I have a problem when going from fullscreen mode to a smaller screen in Pygame. The window appears on the top left and I can't see any exit button, nor can I drag it to the center. Here is the code I am using:
import pygame
from pygame.locals import *
pygame.init()
screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
run = True
while run:
for event in pygame.event.get():
if event == pygame.QUIT:
run = False
if event.type == pygame.KEYDOWN:
# Exit fullscreen with escape key
if event.key == pygame.K_ESCAPE:
if screen.get_flags() & FULLSCREEN:
pygame.display.set_mode((400, 400))
else:
pygame.display.set_mode((0, 0), FULLSCREEN)
I have tried to center the smaller window on the screen which usually works fine, but not in this case.
import os
# .........
if screen.get_flags() & FULLSCREEN:
os.environ['SDL_VIDEO_CENTERED'] = '1'
pygame.display.set_mode((400, 400))
else:
pygame.display.set_mode((0, 0), FULLSCREEN)
Any ideas how to center the window after exiting fullscreen?

This is a bug in pygame.
If you need this behavior, someone who reported the issue on github found a workaround (https://github.com/pygame/pygame/issues/2360)
Hopefully it'll be fixed in 2.0.2, I've written a patch to fix it (https://github.com/pygame/pygame/pull/2460)

unable to see image using pygame.image.load()

I am unable to see the image when I start the program. I have a folder named "game" and "mygame.py" file with a "background.png" all in it. I have tried using the the PATH "/game/background.png" instead of "background.png" but it doesn't seem to work. Any ideas?
my code:
import pygame , sys
pygame.init()
#screen start
def screen():
screen = [1024,768]
screen = pygame.display.set_mode(screen,0,32)
pygame.display.set_caption("Testing Caption")
background = pygame.image.load("background.png")
screen.blit(background, (0,0))
while True:
screen.blit(background, (0,0))
#keyboard commands
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
screen()
Thank you.

You are missing the flip/update call:
clock = pygame.time.Clock()
while True:
#keyboard commands
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
screen.blit(background, (0,0))
pygame.display.flip()
clock.tick(40) # keep program running at given FPS
Every blit occurs in a internal buffer, you need to call flip or update once per frame to update the real screen.

To my knowledge you can make this work one of two ways.
You can use an absolute path to the file, such as:
"C:\path_to_game_folder\game\background.png"
or you can use a relative path. To do this add the following code to your program:
import os
dir = os.path.dirname(__file__)
backgroundFile = os.path.join(dir, "background.png")
and change:
pygame.image.load("background.png")
to
pygame.image.load(backgroundFile)
I suggest using relative paths whenever possible it keeps the code portable as well as makes it easier to maintain and distribute.

I got it! Using pygame its important to use "pygame.display.update()" inside while True: screen.flip doesn't work with pygame to refresh or update the screen. Thanks to the users who responded earlier though.
Full Code:
import pygame , sys
pygame.init()
#screen start
def screen():
width , height = 1280,768
screen = pygame.display.set_mode((width,height))
pygame.display.set_caption("Testing Caption")
background = pygame.image.load("background.jpg")
screen.blit(background, (0,0))
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
screen.blit(background, (0,0))
pygame.display.update()
screen()