[PyGame] screen.fill command wont change color of background

[friska]

Subject explains it all. Any help greatly appreciated.
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

import pygame   pygame.init() # create screen screen = pygame.display.set_mode((800, 600)) # title and icon pygame.display.set_caption("GZSG") icon = pygame.image.load('living-dead.png') pygame.display.set_icon(icon) # player and npcs playerImg = pygame.image.load('target-shooter.png') playerX = 50 playerY = 250 def player(x,y):         screen.blit(playerImg, (x, y)) # game loop running = True while running:         for event in pygame.event.get():         if event.type == pygame.QUIT:             running = False       screen.fill((0, 100, 0))       # if key is pressed check whether its right or left     if event.type == pygame.KEYDOWN:         print("somethign has been pressed")         if event.key == pygame.K_w:             playerY_change = -0.1         if event.key == pygame.K_s:             playerY_change = +0.1         if event.key == pygame.K_d:             playerX_change = +0.1         if event.key == pygame.K_a:             playerX_change = -0.1     if event.type == pygame.KEYUP:         if event.key ==pygame.K_w or event.key == pygame.K_d:             playerY_change = 0     if event.type == pygame.KEYUP:         if event.key ==pygame.K_w or event.key == pygame.K_d:             playerY_change = 0   playerY += playerY_change playerX += playerX_change   player(playerX, playerY) pygame.display.update()

Error:
NameError: name 'playerY_change' is not defined

Yoriz write May-14-2021, 05:49 PM:
Please post all code, output and errors (in their entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.

[Yoriz]

The error NameError: name 'playerY_change' is not defined means that playerY_change has not been assigned a starting value.

---

Are the last 4 lines

1 2 3 4 5

playerY += playerY_change playerX += playerX_change    player(playerX, playerY) pygame.display.update()

Meant to be indented inside the while loop

[friska]

The error NameError: name 'playerY_change' is not defined means that playerY_change has not been assigned a starting value.

---

Are the last 4 lines

1 2 3 4 5

playerY += playerY_change playerX += playerX_change    player(playerX, playerY) pygame.display.update()

Meant to be indented inside the while loop

Thanks for the reply!
I assigned the value. I assume that I didn't at least mess this up haha

1 2	playerY_change = 0 playerX_change = 0

I'm not sure about the last 4 lines. Followed a tutorial.
The problem with the background not changing still persists. It's black when running but for a slight second when closing it turns the desired color. any clue on why it doesn't work?

[Yoriz]

I don't use pygame but I would suggest you take another look at the tutorial because to me those last 4 lines should be in the while loop.
try indenting them to look like this (Note the rest of the code has been removed just to illustrate where the last four lines should be).

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

import pygame    pygame.init() # create screen screen = pygame.display.set_mode((800, 600)) ... ... ... # game loop running = True while running:     ...     ...     ...     if event.type == pygame.KEYUP:         if event.key ==pygame.K_w or event.key == pygame.K_d:             playerY_change = 0        playerY += playerY_change     playerX += playerX_change        player(playerX, playerY)     pygame.display.update()

[BashBedlam]

Does this help you at all?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

import pygame    pygame.init() # create screen screen = pygame.display.set_mode((800, 600)) # title and icon pygame.display.set_caption("GZSG") icon = pygame.image.load('living-dead.png') pygame.display.set_icon(icon) # player and npcs playerImg = pygame.image.load('target-shooter.png') playerX = 50 playerY = 250 def player(x,y):     screen.blit(playerImg, (x, y)) # game loop running = True while running:     for event in pygame.event.get():         if event.type == pygame.QUIT:             running = False     screen.fill((0, 100, 0))     # if key is pressed check whether its right or left     key_pressed = pygame.key.get_pressed ()     if key_pressed [pygame.K_w]:         playerY -= 0.1     if key_pressed [pygame.K_s]:         playerY += 0.1     if key_pressed [pygame.K_d]:         playerX += 0.1     if key_pressed [pygame.K_a]:         playerX -= 0.1     player(playerX, playerY)     pygame.display.update()

[friska]

Yes. Thank you all.
I've managed to accomplish what I set out to. A walk to clear your mind goes a long way.