Blit function not working for displaying an image - python-3.x

Question

I've currently been following along with a video over pygame and creating a space invaders type of game that I will modify for my own implementation of the game. However I've gotten to the section where you have to use the blit function in order to display an image for the background of the game and it's not working for me. Once the program is executed, the window is launched but without the image displayed for the background. I believe that I have properly loaded the image and stepped into the function that will use the blit function for displaying the background image as well. Please let me know if I have overlooked anything, any help will be greatly appreciated.
import pygame
import os
import time
import random
#Setting window frame
WIDTH, HEIGHT = 1000, 600
WINDOW = pygame.display.set_mode((WIDTH,HEIGHT))
pygame.display.set_caption("Space Battle")
#Image Loading
RED_SPACESHIP = pygame.image.load(os.path.join("assets", "pixel_ship_red_small.png"))
GREEN_SPACESHIP = pygame.image.load(os.path.join("assets", "pixel_ship_green_small.png"))
BLUE_SPACESHIP = pygame.image.load(os.path.join("assets", "pixel_ship_blue_small.png"))
#Ship for player
YELLOW_SPACESHIP = pygame.image.load(os.path.join("assets", "pixel_ship_yellow.png"))
#Laser loading
YELLOW_LASER = pygame.image.load(os.path.join("assets", "pixel_laser_yellow.png"))
RED_LASER = pygame.image.load(os.path.join("assets", "pixel_laser_red.png"))
GREEN_LASER = pygame.image.load(os.path.join("assets", "pixel_laser_green.png"))
BLUE_LASER = pygame.image.load(os.path.join("assets", "pixel_laser_blue.png"))
Here is the code for loading in the back ground image
#Loading Backgrnd Img
BG = pygame.image.load(os.path.abspath("assets/background-black.png"))
formatedBG = pygame.transform.scale(BG, (WIDTH,HEIGHT))
Here is the code for the main function and handling background display.
def window_Redraw():
WINDOW.blit(formatedBG, (0,0))
pygame.display.update()
def main():
run = True
FPS = 60
clock = pygame.time.Clock()
while run:
clock.tick(FPS)
window_Redraw()
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
main()
Here is a screenshot of the window after execution:
enter image description here

Answer 1

Your example is much more complicated that it should be. RED_SPACESHIP, BLUE_SPACESHIP... etc are irrelevant in this case and you should remove them.
You are displaying only a black background - nothing else, so it should be displayed. In order to check if everything is working, start from this example:
import pygame
# initialize the pygame module
pygame.init()
WIDTH, HEIGHT = 1000, 600
WINDOW = pygame.display.set_mode((WIDTH, HEIGHT))
formatedBG = pygame.Surface((WIDTH, HEIGHT))
formatedBG.fill(pygame.color.Color(255, 0, 0, 0))
# BG = pygame.image.load(os.path.abspath("assets/background-black.png"))
# formatedBG = pygame.transform.scale(BG, (WIDTH, HEIGHT))
run = True
while run:
WINDOW.blit(formatedBG, (0, 0))
pygame.display.update()
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
And then uncomment the background to check whether the background changed to black color.

Answer 2

My previous version of pygame which was 1.9.4 was causing my initial issues with displaying the background image using blit and the problem with the window not being able to display any color with the fill function. I solved these issues by running the command 'pip install==2.0.0.dev4' to upgrade pygame. Everything seems to be working properly now.